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RESTRAINTS

                                                                                                                                                                    A




                                                                                 SECTION
                                                              SEAT BELT CONTROL SYSTEM
                                                                                                             SBC                                                    B



                                                                                                                                                                    C


                                                                                                                                                                    D


                                                                                                                                                                    E
                                                                 CONTENTS
BASIC INSPECTION ................................... 3
                                                .                                  Description ..............................................................18
                                                                                                                                                         .          F
                                                                                   DTC Logic ...............................................................18
                                                                                                                                                         .
DIAGNOSIS AND REPAIR WORKFLOW ......... 3
                                  .                                                Diagnosis Procedure ..............................................18  .
  Work Flow ................................................................ 3
                                                                      .            Component Inspection ............................................19   .          G
FUNCTION DIAGNOSIS .............................. 6
                                             .                                   B2454 MOTOR PWR SUP CIRC ...................... 20
                                                                                   Description ..............................................................20
                                                                                                                                                         .
SEAT BELT TENSION REDUCER SYSTEM ..... 6                                           DTC Logic ...............................................................20
                                                                                                                                                         .          SBC
  System Diagram ....................................................... 6
                                                                  .                Diagnosis Procedure ..............................................20  .
  System Description .................................................. 6
                                                                  .
  Component Parts Location ....................................... 7
                                                                  .              B2455 PSB C/U INT CIRCUIT .......................... 21                             I
  Component Description ............................................ 7
                                                                  .                Description ..............................................................21
                                                                                                                                                         .
                                                                                   DTC Logic ...............................................................21
                                                                                                                                                         .
PRE-CRASH SEAT BELT SYSTEM .................. 8
                                        .
  System Diagram ....................................................... 8
                                                                  .              BRAKE PEDAL STROKE SENSOR SHIELD                                                   J
  System Description .................................................. 8
                                                                  .              WIRE CIRCUIT CHECK .................................... 22
  Component Parts Location ..................................... 10
                                                                  .                Description ..............................................................22
                                                                                                                                                         .
  Component Description .......................................... 10
                                                                  .                Component Function Check ...................................22        .          K
ON BOARD DIAGNOSTIC (OBD) SYSTEM .....11
                                  .                                              SEAT BELT BUCKLE SWITCH (DRIVER
  Diagnosis Description ............................................ 11
                                                                .                SIDE) CIRCUIT CHECK .................................... 23
  CONSULT-III Function ........................................... 11
                                                                .                                                                                                   L
                                                                                   Description ..............................................................23
                                                                                                                                                           .
                                                                                   Component Function Check ...................................23          .
COMPONENT DIAGNOSIS ........................ 13
                                         .                                         Component Inspection (Driver seat belt buckle
                                                                                   switch) ....................................................................23
                                                                                                                                                           .        M
U1000 CAN COMM CIRCUIT ............................13
                                               .
  Description ............................................................. 13
                                                                       .           Component Inspection (Driver seat belt buckle
                                                                                   switch ground circuit) ..............................................24 .
  DTC Logic .............................................................. 13
                                                                       .
                                                                                                                                                                    N
B2451 SB MOTOR RH CIRC ............................14
                                               .                                 SEAT BELT BUCKLE SWITCH (PASSEN-
  Description ............................................................. 14
                                                                       .         GER SIDE) CIRCUIT CHECK ........................... 25
  DTC Logic .............................................................. 14
                                                                       .           Description ..............................................................25
                                                                                                                                                           .
                                                                                   Component Function Check ...................................25          .        O
  Diagnosis Procedure .............................................. 14.
  Component Inspection ........................................... 14  .           Component Inspection (Passenger seat belt buck-
                                                                                   le switch) .................................................................25
                                                                                                                                                           .
B2452 SB MOTOR LH CIRC ............................16
                                               .                                   Component Inspection (Passenger seat belt side                                   P
  Description ............................................................. 16
                                                                       .           buckle switch ground circuit) ..................................26      .
  DTC Logic .............................................................. 16
                                                                       .
  Diagnosis Procedure .............................................. 16.         IGNITION POWER SUPPLY CIRCUIT
  Component Inspection ........................................... 16  .         CHECK .............................................................. 27
                                                                                   Description ..............................................................27
                                                                                                                                                         .
B2453 BR STROK SEN CIRC ..........................18
                                              .                                    Component Function Check ...................................27        .



Revision: 2007 June                                                       SBC-1                                                                  G37 Coupe
PRE-CRASH SEAT BELT CONTROL UNIT                                                   PRECAUTION ............................................ 37
GROUND CIRCUIT CHECK ............................. 28
                                               .
  Description ............................................................. 28
                                                                        .          PRECAUTIONS ................................................ 37
                                                                                                                                            .
  Component Function Check .................................. 28        .            Precaution for Supplemental Restraint System
                                                                                     (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
ECU DIAGNOSIS ....................................... 29
                                                  .                                  SIONER" ................................................................ 37
                                                                                                                                                          .
                                                                                     Precaution for Seat Belt Service ............................ 37     .
PRE-CRASH SEAT BELT CONTROL UNIT .... 29
                                  .                                                  Precaution for Battery Service ............................... 38    .
  Reference Value .................................................... 29 .
  Fail Safe ................................................................ 30
                                                                          .        ON-VEHICLE MAINTENANCE .................. 39
  DTC Index ............................................................. 30
                                                                          .
  Wiring Diagram - SEAT BELT CONTROL SYS-                                          BRAKE PEDAL STROKE SENSOR ................ 39
                                                                                                                          .
  TEM - ..................................................................... 31
                                                                          .          Exploded View ....................................................... 39
                                                                                                                                                       .
                                                                                     Removal and Installation ........................................ 39
                                                                                                                                                       .
SYMPTOM DIAGNOSIS ............................ 36
                                           .
                                                                                   PRE-CRASH SEAT BELT CONTROL UNIT .... 40
                                                                                                                     .
PRE-CRASH SEAT BELT SYSTEM ................ 36
                                        .                                            Exploded View ....................................................... 40
                                                                                                                                                       .
  Description ............................................................. 36
                                                                        .            Removal and Installation ........................................ 40
                                                                                                                                                       .
  Symptom Table ..................................................... 36.




Revision: 2007 June                                                         SBC-2                                                                G37 Coupe
                           DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION                                                                                                         A
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow                                                                                      INFOID:0000000001711963
                                                                                                                         B



                                                                                                                         C


                                                                                                                         D


                                                                                                                         E



                                                                                                                         F


                                                                                                                         G


                                                                                                                         SBC



                                                                                                                          I


                                                                                                                         J



                                                                                                                         K


                                                                                                                         L



                                                                                                                         M

                                                                                             JMHIA0429GB

                                                                                                                         N
1.GET INFORMATION FOR SYSTEM
Interview the customer to obtain the malfunction information (conditions and environment when the malfunc-
tion occurred) as much as possible when the customer brings the vehicles in.                                             O


         >> GO TO 2.
                                                                                                                         P
2.STUDY AND UNDERSTAND THE SYSTEM DESCRIPTION
Understand the operation condition or non-operation condition of pre-crash seat belt. Refer to SBC-8, "System
Description".

         >> GO TO 3.



Revision: 2007 June                               SBC-3                                             G37 Coupe
                            DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
3.CHECK DTC
Perform "Self-diagnosis procedure" of appropriate DTC to check if DTC is detected again.
At this time, always connect CONSULT-III to the vehicle, and then check the diagnosis results in real time on
"DATA MONITOR (AUTO RECORD)".
There is no priority for each DTC. Record them based on the following rules.
Current malfunction: Record all DTCs detected.
Past malfunction: Record up to 5 DTCs. When the 6th DTC is detected, it is overwritten to the last recorded
DTC.
Is DTC detected?
  YES >> GO TO 4.
  NO      >> Follow the diagnosis simulation test to check. Refer to GI-38, "Intermittent Incident".
4.PERFORM PRELIMINARY CHECK
Perform Pre-Diagnosis Inspection. Refer to SBC-36, "Description".

         >> GO TO 5.
5.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE
Identify the malfunctioning system with "Diagnosis Chart by Symptom". Refer to SBC-36, "Description".

 With CONSULT-III>>GO TO 6.
 Without CONSULT-III>>GO TO 7 (Parts system).
 Without CONSULT-III>>GO TO 8 (Power supply, ground system).
6.PERFORM DTC CONFIRMATION PROCEDURE"
Perform the inspection with "DTC REPRODUCTION PROCEDURE" of the applicable system.

         >> GO TO 7.
7.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Identify the malfunctioning part with "Diagnosis Procedure".
Are malfunctioning parts detected?
 YES >> GO TO 10.
 NO       >> GO TO 9.
8.PERFORM COMPONENT FUNCTION CHECK
Identify the malfunctioning part with "Component Parts Function Inspection".
Are malfunctioning parts detected?
 YES >> GO TO 10.
 NO       >> GO TO 9.
9.PERFORM COMPONENT INSPECTION
Perform the inspection with "Component Parts Inspection".

         >> GO TO 10.
10.REPAIR OR REPLACE THE MALFUNCTIONING PART
Repair or replace the specified malfunctioning parts.
After repairing or replacing, reconnect parts or connector disconnected in "Diagnosis Procedure", and then
erase DTC if necessary. Refer to SBC-11, "Diagnosis Description".

         >> GO TO 11.
11.FINAL CHECK
Perform "CONSULT-lll function" again to check that the repair is performed correctly.


Revision: 2007 June                                SBC-4                                          G37 Coupe
                          DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,
referring to the symptom inspection result in step 4.                                                      A
Are all malfunctions corrected?
 YES >> 



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