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BRAKES

                                                                                                                                                                     A




                                                                                    SECTION
                                                                              BRAKE CONTROL SYSTEM
                                                                                                              BRC                                                    B



                                                                                                                                                                     C


                                                                                                                                                                     D


                                                                                                                                                                     E
                                                                   CONTENTS
                           VDC/TCS/ABS                                                Component Parts Location .....................................19
                                                                                                                                                  .                  BRC
                                                                                      Component Description ..........................................21
                                                                                                                                                  .
BASIC INSPECTION ................................... 4
                                                .
                                                                                    EBD ................................................................... 22
                                                                                                                                                                     G
DIAGNOSIS AND REPAIR WORKFLOW ......... 4
                                  .                                                   System Diagram .....................................................22
                                                                                                                                                      .
  Work Flow ................................................................ 4
                                                                      .               System Description .................................................22
                                                                                                                                                      .
  Diagnostic Work Sheet ............................................. 7
                                                                      .               Component Parts Location .....................................23.
                                                                                      Component Description ..........................................25
                                                                                                                                                      .              H
INSPECTION AND ADJUSTMENT .................... 8
                                         .
                                                                                    DIAGNOSIS SYSTEM [ABS ACTUATOR
ADDITIONAL SERVICE WHEN REPLACING                                                   AND ELECTRIC UNIT (CONTROL UNIT)] ....... 26
CONTROL UNIT ......................................................... 8
                                                                .                                                                                                     I
                                                                                      CONSULT-III Function ...........................................26
                                                                                                                                                  .
 ADDITIONAL SERVICE WHEN REPLACING
 CONTROL UNIT : Description ................................. 8 .                   COMPONENT DIAGNOSIS ........................ 31
                                                                                                                             .
 ADDITIONAL SERVICE WHEN REPLACING                                                                                                                                   J
 CONTROL UNIT : Special Repair Requirement ...... 8                                 C1101, C1102, C1103, C1104 WHEEL SEN-
                                                                                    SOR-1 ................................................................ 31
ADJUSTMENT OF STEERING ANGLE SENSOR                                                   Description ..............................................................31
                                                                                                                                                            .
NEUTRAL POSITION ................................................. 8     .                                                                                           K
                                                                                      DTC Logic ...............................................................31
                                                                                                                                                            .
 ADJUSTMENT OF STEERING ANGLE SENSOR                                                  Diagnosis Procedure ..............................................31  .
 NEUTRAL POSITION : Description ......................... 8              .
                                                                                      Component Inspection ............................................33   .
 ADJUSTMENT OF STEERING ANGLE SENSOR                                                                                                                                 L
                                                                                      Special Repair Requirement ...................................33      .
 NEUTRAL POSITION : Special Repair Require-
 ment ......................................................................... 8
                                                                         .          C1105, C1106, C1107, C1108 WHEEL SEN-
                                                                                    SOR-2 ................................................................ 34        M
FUNCTION DIAGNOSIS ............................. 10
                                             .                                        Description ..............................................................34
                                                                                                                                                            .
VDC ...................................................................10
                                                                   .                  DTC Logic ...............................................................34
                                                                                                                                                            .
  System Diagram ..................................................... 10
                                                                  .                   Diagnosis Procedure ..............................................34  .        N
  System Description ................................................ 10
                                                                  .                   Component Inspection ............................................36   .
  Component Parts Location ..................................... 11
                                                                  .                   Special Repair Requirement ...................................36      .
  Component Description .......................................... 13
                                                                  .                 C1109 POWER AND GROUND SYSTEM ........ 37                                        O
TCS ....................................................................14
                                                                    .                 Description ..............................................................37
                                                                                                                                                            .
  System Diagram ..................................................... 14
                                                                  .                   DTC Logic ...............................................................37
                                                                                                                                                            .
  System Description ................................................ 14
                                                                  .                   Diagnosis Procedure ..............................................37  .        P
  Component Parts Location ..................................... 15
                                                                  .                   Special Repair Requirement ...................................38      .
  Component Description .......................................... 17
                                                                  .                 C1110, C1153, C1170 ABS ACTUATOR AND
ABS ...................................................................18
                                                                   .                ELECTRIC UNIT (CONTROL UNIT) ................. 39
  System Diagram ..................................................... 18
                                                                  .                   DTC Logic ...............................................................39
                                                                                                                                                           .
  System Description ................................................ 18
                                                                  .                   Diagnosis Procedure ..............................................39 .
                                                                                      Special Repair Requirement ...................................39     .


Revision: 2007 June                                                          BRC-1                                                                 G37 Coupe
C1111 ABS MOTOR, MOTOR RELAY SYS-                                                C1143, C1144 STEERING ANGLE SENSOR ... 59
TEM ................................................................... 40
                                                                    .              Description ............................................................. 59
                                                                                                                                                         .
  Description ............................................................. 40
                                                                        .          DTC Logic .............................................................. 59
                                                                                                                                                         .
  DTC Logic .............................................................. 40
                                                                        .          Diagnosis Procedure .............................................. 59 .
  Diagnosis Procedure ............................................. 40  .          Component Inspection ........................................... 60   .
  Component Inspection ........................................... 41   .          Special Repair Requirement .................................. 60      .
  Special Repair Requirement .................................. 41      .
                                                                                 C1145, C1146 YAW RATE/SIDE G SENSOR... 61
C1114 ACTUATOR RELAY SYSTEM .............. 42
                                       .                                           Description ............................................................. 61
                                                                                                                                                         .
  Description ............................................................. 42
                                                                        .          DTC Logic .............................................................. 61
                                                                                                                                                         .
  DTC Logic .............................................................. 42
                                                                        .          Diagnosis Procedure .............................................. 61 .
  Diagnosis Procedure ............................................. 42  .          Component Inspection ........................................... 62   .
  Component Inspection ........................................... 43   .          Special Repair Requirement .................................. 63      .
  Special Repair Requirement .................................. 43      .
                                                                                 C1147, C1148, C1149, C1150 USV/HSV LINE 64
                                                                                                                        ...
C1115 WHEEL SENSOR .................................. 44
                                                  .                                Description ............................................................. 64
                                                                                                                                                         .
  Description ............................................................. 44
                                                                        .          DTC Logic .............................................................. 64
                                                                                                                                                         .
  DTC Logic .............................................................. 44
                                                                        .          Diagnosis Procedure .............................................. 64 .
  Diagnosis Procedure ............................................. 44  .          Component Inspection ........................................... 65   .
  Component Inspection ........................................... 45   .          Special Repair Requirement .................................. 66      .
  Special Repair Requirement .................................. 46      .
                                                                                 C1155 BRAKE FLUID LEVEL SWITCH .......... 67
                                                                                                                       .
C1116 STOP LAMP SWITCH ........................... 47
                                               .                                   Description ............................................................. 67
                                                                                                                                                         .
  Description ............................................................. 47
                                                                        .          DTC Logic .............................................................. 67
                                                                                                                                                         .
  DTC Logic .............................................................. 47
                                                                        .          Diagnosis Procedure .............................................. 67 .
  Diagnosis Procedure ............................................. 47  .          Component Inspection ........................................... 68   .
  Component Inspection ........................................... 48   .          Special Repair Requirement .................................. 68      .
  Special Repair Requirement .................................. 48      .
                                                                                 C1185 ICC UNIT ............................................... 69
                                                                                                                                            .
C1120, C1122, C1124, C1126 IN ABS SOL .... 49
                                       .                                           Description ............................................................. 69
                                                                                                                                                         .
  Description ............................................................. 49
                                                                        .          DTC Logic .............................................................. 69
                                                                                                                                                         .
  DTC Logic .............................................................. 49
                                                                        .          Diagnosis Procedure .............................................. 69 .
  Diagnosis Procedure ............................................. 49  .          Special Repair Requirement .................................. 69      .
  Component Inspection ........................................... 50   .
  Special Repair Requirement .................................. 51      .        U1000, U1002 CAN COMM CIRCUIT .............. 70
                                                                                                                          .
                                                                                   Description ............................................................. 70
                                                                                                                                                         .
C1121, C1123, C1125, C1127 OUT ABS SOL... 52                                       DTC Logic .............................................................. 70
                                                                                                                                                         .
  Description ............................................................. 52
                                                                        .          Diagnosis Procedure .............................................. 70 .
  DTC Logic .............................................................. 52
                                                                        .          Special Repair Requirement .................................. 70      .
  Diagnosis Procedure ............................................. 52  .
  Component Inspection ........................................... 53   .        PARKING BRAKE SWITCH ............................. 71
                                                                                                                                .
  Special Repair Requirement .................................. 54      .          Description ............................................................. 71
                                                                                                                                                         .
                                                                                   Component Function Check .................................. 71        .
C1130, C1131, C1132 ENGINE SIGNAL ......... 55
                                        .                                          Diagnosis Procedure .............................................. 71 .
  Description ............................................................. 55
                                                                        .          Component Inspection ........................................... 72   .
  DTC Logic .............................................................. 55
                                                                        .
  Diagnosis Procedure ............................................. 55  .        VDC OFF SWITCH ........................................... 73
                                                                                                                                        .
  Special Repair Requirement .................................. 55      .          Description ............................................................. 73
                                                                                                                                                         .
                                                                                   Component Function Check .................................. 73        .
C1138 4WAS SYSTEM ..................................... 56
                                                    .                              Diagnosis Procedure .............................................. 73 .
  Description ............................................................. 56
                                                                        .          Component Inspection ........................................... 74   .
  DTC Logic .............................................................. 56
                                                                        .
  Diagnosis Procedure ............................................. 56  .        ABS WARNING LAMP ..................................... 75
                                                                                                                                    .
  Special Repair Requirement .................................. 56      .          Description ............................................................. 75
                                                                                                                                                         .
                                                                                   Component Function Check .................................. 75        .
C1142 PRESS SENSOR .................................. 57
                                                  .                                Diagnosis Procedure .............................................. 75 .
  Description ............................................................. 57
                                                                        .
  DTC Logic .............................................................. 57
                                                                        .        BRAKE WARNING LAMP ................................ 76
                                                                                                                                 .
  Diagnosis Procedure ............................................. 57  .          Description ............................................................. 76
                                                                                                                                                         .
  Component Inspection ........................................... 58   .          Component Function Check .................................. 76        .
  Special Repair Requirement .................................. 58      .          Diagnosis Procedure .............................................. 76 .

Revision: 2007 June                                                       BRC-2                                                                 G37 Coupe
VDC OFF INDICATOR LAMP ...........................77
                                              .                                    PRECAUTION ............................................. 97
                                                                                                                                        .
  Description ............................................................. 77
                                                                       .                                                                                                A
  Component Function Check ................................... 77      .           PRECAUTIONS ................................................. 97
  Diagnosis Procedure .............................................. 77.             Precaution for Supplemental Restraint System
                                                                                     (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
                                                                                                                                                                        B
SLIP INDICATOR LAMP ...................................78
                                                   .                                 SIONER" ................................................................97
                                                                                                                                                         .
  Description ............................................................. 78
                                                                       .             Precaution for Procedure without Cowl Top Cover 97                  ....
  Component Function Check ................................... 78      .             Precaution for Brake System ..................................97    .
  Diagnosis Procedure .............................................. 78.             Precaution for Brake Control ..................................98   .              C

ECU DIAGNOSIS ........................................ 79
                                                   .                               PREPARATION .......................................... 99
                                                                                                                                      .
ABS ACTUATOR AND ELECTRIC UNIT                                                                                                                                          D
                                                                                   PREPARATION ................................................. 99
(CONTROL UNIT) .............................................79
                                                        .                            Special Service Tool ...............................................99
                                                                                                                                                     .
  Reference Value .................................................... 79.           Commercial Service Tool .......................................99
                                                                                                                                                     .
  Wiring Diagram - BRAKE CONTROL SYSTEM -.... 83                                                                                                                        E
  Fail-Safe ................................................................. 87
                                                                         .         ON-VEHICLE REPAIR .............................. 100
                                                                                                                                  .
  DTC No. Index ....................................................... 88
                                                                         .
                                                                                   WHEEL SENSOR ............................................ 100
                                                                                                                                                                        BRC
SYMPTOM DIAGNOSIS ............................. 90
                                            .                                        Exploded View ...................................................... 100
                                                                                                                                                       .
                                                                                     Removal and Installation ...................................... 100
                                                                                                                                                       .
EXCESSIVE ABS FUNCTION OPERATION
FREQUENCY ....................................................90
                                                          .                        SENSOR ROTOR ............................................ 101                        G
  Diagnosis Procedure .............................................. 90
                                                                .                  FRONT SENSOR ROTOR ...................................... 101              .
UNEXPECTED PEDAL REACTION .................91
                                       .                                            FRONT SENSOR ROTOR : Exploded View ........ 101                           .
                                                                                    FRONT SENSOR ROTOR : Removal and Instal-                                            H
  Diagnosis Procedure .............................................. 91
                                                                .
                                                                                    lation ..................................................................... 101
                                                                                                                                                              .
THE BRAKING DISTANCE IS LONG ...............92
                                        .
                                                                                   REAR SENSOR ROTOR ........................................ 101              .         I
  Diagnosis Procedure .............................................. 92
                                                                .
                                                                                    REAR SENSOR ROTOR : Exploded View ........... 101                          .
ABS FUNCTION DOES NOT OPERATE ..........93
                                    .                                               REAR SENSOR ROTOR : Removal and Installa-
  Diagnosis Procedure .............................................. 93
                                                                .                   tion ........................................................................ 101
                                                                                                                                                               .
                                                                                                                                                                        J
PEDAL VIBRATION OR ABS OPERATION                                                   ABS ACTUATOR AND ELECTRIC UNIT
SOUND OCCURS .............................................94
                                                      .                            (CONTROL UNIT) ........................................... 102
  Diagnosis Procedure .............................................. 94
                                                                .                    Exploded View ...................................................... 102
                                                                                                                                                       .                K
                                                                                     Removal and Installation ...................................... 102
                                                                                                                                                       .
VEHICLE JERKS DURING VDC/TCS/ABS
CONTROL .........................................................95
                                                             .                     YAW RATE/SIDE G SENSOR ........................ 104
                                                                                     Exploded View ...................................................... 104
                                                                                                                                                       .                L
  Diagnosis Procedure .............................................. 95
                                                                .
                                                                                     Removal and Installation ...................................... 104
                                                                                                                                                       .
NORMAL OPERATING CONDITION ................96
                                       .
  Description ............................................................. 96
                                                                       .           STEERING ANGLE SENSOR ......................... 105                                  M
                                                                                     Exploded View ...................................................... 105
                                                                                                                                                       .
                                                                                     Removal and Installation ...................................... 105
                                                                                                                                                       .
                                                                                                                                                                        N



                                                                                                                                                                        O



                                                                                                                                                                        P




Revision: 2007 June                                                         BRC-3                                                                    G37 Coupe
                            DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >                                                                          [VDC/TCS/ABS]

BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow                                                                                          INFOID:0000000001635017




PRECAUTIONS FOR DIAGNOSIS
If steering angle sensor, steering system parts, suspension system parts, 4WAS system parts, ABS actuator
and electric unit (control unit) or tires have been replaced, or if wheel alignment has been adjusted, be sure to
adjust neutral position of steering angle sensor before driving. Refer to BRC-8, "ADJUSTMENT OF STEER-
ING ANGLE SENSOR NEUTRAL POSITION : Description".




Revision: 2007 June                                 BRC-4                                               G37 Coupe
                          DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >                                                                    [VDC/TCS/ABS]
OVERALL SEQUENCE
                                                                                                              A


                                                                                                              B



                                                                                                              C


                                                                                                              D


                                                                                                              E



                                                                                                              BRC



                                                                                                              G


                                                                                                              H



                                                                                                               I


                                                                                                              J



                                                                                                              K


                                                                                                              L



                                                                                                              M



                                                                                                              N



                                                                                                              O


                                                                                           JSFIA0010GB
                                                                                                              P
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred) using the diagnosis worksheet. Refer to BRC-7, "Diagnostic Work Sheet".

         >> GO TO 2.

Revision: 2007 June                             BRC-5                                             G37 Coupe
                            DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >                                                                        [VDC/TCS/ABS]

2.PERFORM THE SELF-DIAGNOSIS
Check the DTC display with the self-diagnosis function.
Is there any DTC displayed?
  YES >> GO TO 3.
  NO      >> GO TO 4.
3.PERFORM THE SYSTEM DIAGNOSIS
Perform the diagnosis applicable to the displayed DTC. Refer to BRC-88, "DTC No. Index".

         >> GO TO 7.
4.CHECK THE SYMPTOM THAT IS NOT CONSIDERED A SYSTEM MALFUNCTION
Check that the symptom is a normal operation that is not considered a system malfunction. Refer to BRC-96,
"Description".
Is the symptom a normal operation?
  YES >> INSPECTION END
  NO     >> GO TO 5.
5.CHECK THE WARNING LAMP AND INDICATOR LAMP FOR ILLUMINATION
Check that the warning lamp and indicator lamp illuminate.



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