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STEERING CONTROL SYSTEM

G STEERING

B
SECTION
STEERING CONTROL SYSTEM C

E
CONTENTS
EPS Schematic .............................................................. 14
. F
Wiring Diagram--RAS-- ....................................... 15 .
PRECAUTIONS ......................................................... 3
. Control Unit Input/Output Signal Standard ............ 21 .
Precautions for Supplemental Restraint System CIRCUIT TESTER REFERENCE VALUE .......... 21 . STC
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- STANDARD BY CONSULT-II ............................. 22 .
SIONER" ................................................................. 3
. CONSULT-II Function (RAS/HICAS) ..................... 23 .
Precautions for Battery Service ............................... 3 . CONSULT-II MAIN FUNCTION .......................... 23 .
Service Notice or Precautions ................................. 3 . H
CONSULT-II SETTING PROCEDURE ............... 23 .
SYSTEM DESCRIPTION ........................................... 4 . Self-Diagnosis ....................................................... 23
.
Components ............................................................ 4
. OPERATION PROCEDURE ............................... 23 .
EPS System Function ............................................. 4 . ERASE MEMORY .............................................. 23 . I
Fail-Safe Function ................................................... 4
. DISPLAY ITEM LIST .......................................... 23 .
FAIL-SAFE INPUT/CANCEL CONDITIONS ........ 5 . Data Monitor .......................................................... 25
.
OPERATION PROCEDURE ............................... 25 . J
RAS DISPLAY ITEM LIST .......................................... 25 .
Active Test ............................................................. 26
.
PRECAUTIONS ......................................................... 6
. OPERATION PROCEDURE ............................... 26 .
Precautions for Supplemental Restraint System K
Control Unit Part Number ...................................... 26 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- OPERATION PROCEDURE ............................... 26 .
SIONER" ................................................................. 6
. Diagnosis Procedure With Self-Diagnosis Function
Precautions for Battery Service ............................... 6 . (Without CONSULT-II) ........................................... 26 . L
Service Notice or Precautions ................................. 6 . DESCRIPTION ................................................... 26 .
REAR ACTIVE STEER .............................................. 7 . SELF-DIAGNOSIS PROCEDURE ..................... 26 .
Removal and Installation ......................................... 7. SELF-DIAGNOSIS DISPLAY ............................. 26 . M
COMPONENTS ................................................... 7 . SELF-DIAGNOSIS DISPLAY ITEMS ................. 26 .
REMOVAL ............................................................ 7
. HOW TO ERASE SELF-DIAGNOSIS ................ 27 .
INSTALLATION .................................................... 7
. CAN Communication ............................................. 27 .
Disassembly and Assembly .................................... 8 . SYSTEM DESCRIPTION ................................... 27 .
COMPONENTS ................................................... 8 . For Fast and Accurate Trouble Diagnosis ............. 27 .
DISASSEMBLY .................................................... 8. Basic Inspection .................................................... 27
.
INSPECTION AFTER DISASSEMBLY ................ 8 . BASIC INSPECTION 1: POWER SUPPLY CIR-
ASSEMBLY .......................................................... 8
. CUIT TERMINAL LOOSENESS AND BATTERY 27 ...
Neutral Position Adjustment .................................... 8 . BASIC INSPECTION 2: RAS WARNING LAMP
SYSTEM DESCRIPTION ......................................... 10 . INSPECTION ..................................................... 27 .
Components .......................................................... 10
. BASIC INSPECTION 3: RAS CONTROL UNIT
RAS Function ........................................................ 10
. POWER SUPPLY CIRCUIT AND GROUND CIR-
Fail-Safe Function ..................................................11
. CUIT INSPECTION ............................................ 27 .
TROUBLE DIAGNOSIS ........................................... 12 . Trouble Diagnosis Chart ........................................ 28 .
How to Perform Trouble Diagnosis ....................... 12 . SELF-DIAGNOSIS ............................................. 28 .
BASIC CONCEPT .............................................. 12 . DIAGNOSIS CHART BY SYMPTOM ................. 29 .
Component Parts Location .................................... 13 .

Revision: 2006 August STC-1 2007 G35 Coupe
Inspection 1: RAS Control Unit Malfunction .......... 30 . TILT/TELESCOPIC
Inspection 2: Motor Power Supply System ............ 30 .
Inspection 3: RAS Motor Output Malfunction ........ 32 . PRECAUTIONS ........................................................45 .
Inspection 4: Vehicle Speed Signal ....................... 33 . Precautions for Supplemental Restraint System
Inspection 5: Steering Angle Signal Malfunction ... 33 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Inspection 6: Rear Main Signal and Rear Sub Signal SIONER" ................................................................45
.
Malfunction ............................................................ 35
. Precautions for Battery Service .............................45 .
Inspection 7: VDC Malfunction .............................. 37 . TILT & TELESCOPIC SYSTEM ...............................46 .
Inspection 8: Engine Speed Signal Malfunction .... 37 . System Description ................................................46.
Inspection 9: CAN Communication System Mal- OPERATION .......................................................46.
function .................................................................. 38
. Component Parts and Harness Connector Location ...46
Inspection 10: Stop Lamp Switch Harness ............ 39 . Schematic ..............................................................47
.
Inspection 11: RAS Warning Lamp Harness ......... 39 . Wiring Diagram--TILTEL-- ...................................48 .
Diagnosis Chart by Symptom 1 ............................. 41 . Terminals and Reference Values for Automatic
Diagnosis Chart by Symptom 2 ............................. 41 . Drive Positioner Control Unit ..................................51 .
Check RAS Static/Dynamic Characteristics ........... 43 . Preliminary Check ..................................................52
.
Component Parts Inspection ................................. 44 . POWER SUPPLY AND GROUND CIRCUIT
RAS MOTOR RELAY ......................................... 44 . INSPECTION ......................................................52.
RAS MOTOR ...................................................... 44 . Symptom 1: Telescopic System does not Operate...53
REAR WHEEL STEERING ANGLE SENSOR ... 44 Symptom 2: Tilt System does not Operate ............55 .

Revision: 2006 August STC-2 2007 G35 Coupe
PRECAUTIONS
[EPS]
PRECAUTIONS
[EPS] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NGS000AM

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING: D
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. E
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors. STC
Precautions for Battery Service NGS000AN

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the H
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
I
Service Notice or Precautions NGS000AO

The following abbreviations are used.
q EPS: Electronically controlled power steering J
q RAS: Rear active steer

Revision: 2006 August STC-3 2007 G35 Coupe
SYSTEM DESCRIPTION
[EPS]
SYSTEM DESCRIPTION PFP:00000

Components NGS000A5

SGIA1446E

EPS System Function NGS000A6

q Vehicle speed sensing electronically controlled power steering
(that properly controls the steering force by the vehicle speed)
has been adopted. When it is normal, it controls the power
steering solenoid valve according to the vehicle speed as shown
in the figure and makes the steering force proper.
q For schematic, wiring diagram and trouble diagnosis, refer to
STC-14, "Schematic" , STC-15, "Wiring Diagram--RAS--" ,
STC-41, "Diagnosis Chart by Symptom 2" , because EPS is
controlled by RAS control unit.

SST696CA

Fail-Safe Function NGS000A7

When the fail-safe function operate, it controls power steering sole-
noid valve by the engine speed as shown in the figure and maintains
the steering force.

SGIA0411E

Revision: 2006 August STC-4 2007 G35 Coupe
SYSTEM DESCRIPTION
[EPS]
FAIL-SAFE INPUT/CANCEL CONDITIONS
Input conditions Cancel conditions
A

When vehicle runs at an engine speed of 1,500 rpm or higher and no vehicle speed q A vehicle speed of 2 km/h (1.2 MPH)
signal is received for 10 seconds. or more is input.
B
The continuous vehicle speed signal 30 km/h (19 MPH) or more suddenly drops to q Turn the ignition switch ON after turn-
less than 2 km/h (1.2 MPH) within 1.4 seconds. ing it OFF.
CAUTION:
Fail-safe function is activated when the engine runs at 1,500 rpm or higher for 10 seconds with the vehicle stopped. This is C
normal and the fail-safe function is automatically deactivated when a vehicle speed signal of 2 km/h (1.2 MPH) or higher is
input or the ignition switch is turned OFF.
D

STC

Revision: 2006 August STC-5 2007 G35 Coupe
PRECAUTIONS
[RAS]
PRECAUTIONS
[RAS] PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NGS000AY

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Battery Service NGS000AZ

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
Service Notice or Precautions NGS000B0

The following abbreviations are used.
RAS: Rear active steer

Revision: 2006 August STC-6 2007 G35 Coupe
REAR ACTIVE STEER
[RAS]
REAR ACTIVE STEER PFP:55705
A
Removal and Installation NGS00094

COMPONENTS
B

STC
SGIA1238E

1. Rear lower link 2. Decenter cam 3. RAS actuator assembly
H
Refer to GI-10, "Components" , for the symbol in the figure.

REMOVAL
1. Remove coil spring. Refer to RSU-15, "Removal and Installation" . I
2. Disconnect harness connector from RAS actuator assembly and rear suspension member.
3. Remove fixing bolts and nuts of RAS actuator assembly (1), and
then remove RAS actuator assembly (1) from rear suspension J
member.

SGIA1239E

M
INSTALLATION
q Installation is the reverse order of removal. For tightening torque, refer to STC-7, "COMPONENTS" .
q When installing RAS actuator assembly to rear suspension member, check the mounting surfaces of RAS
actuator assembly and rear suspension member for oil, dirt, sand, or other foreign materials.
q To perform the neutral position adjustment. Refer to STC-8, "Neutral Position Adjustment" .

Revision: 2006 August STC-7 2007 G35 Coupe
REAR ACTIVE STEER
[RAS]
Disassembly and Assembly NGS00095

COMPONENTS

SGIA1052J

1. Ground terminal 2. RAS motor assembly 3. O-ring
4. RAS actuator 5. Rear wheel steering angle sensor
Refer to GI-10, "Components" , for the symbols in the figure.

DISASSEMBLY
1. Remove mounting bolts of RAS motor assembly, and then remove RAS motor assembly, ground terminal,
O-ring from RAS actuator.
2. Remove mounting bolt of rear wheel steering angle sensor, and then remove rear wheel steering angle
sensor, O-ring from RAS actuator.
INSPECTION AFTER DISASSEMBLY
Check RAS actuator bracket (rear wheel steering angle sensor mounting area) for crush, deformation, cracks,
or other damage. Replace the RAS actuator malfunction is detected.
ASSEMBLY
q Assembly is the reverse order of disassembly. For tightening torque, refer to STC-8, "COMPONENTS" .
q After assembling RAS actuator assembly (after removing and installing rear wheel angle sensor and RAS
motor), perform the neutral position adjustment.
Neutral Position Adjustment NGS00096

Adjust neutral position after performing the following procedure.
q Removing and installing or replacing the RAS actuator assembly
q Disassembling the RAS actuator assembly (when removing rear wheel steering angle sensor and RAS
motor)
CAUTION:
Perform the neutral position adjustment after installing the RAS actuator assembly to the vehicle.
Before that, remove the rear lower link from the RAS actuator.
1. Disconnect harness connector and remove rear wheel steering angle sensor from the RAS actuator
assembly.
2. Disconnect RAS motor harness connector.
3. Turn ignition switch ON.

Revision: 2006 August STC-8 2007 G35 Coupe
REAR ACTIVE STEER
[RAS]
4. Supply 6 V voltage by connecting the four 1.5 V batteries in a
series. Connect them to the RAS motor connector (motor side), A
and then operate the motor and adjust the rack in the neutral
position (A).
Full stroke (B) : 6.8 - 7.2 mm (0.268 - 0.283 in) B
CAUTION:
Do not supply 12 V voltage (battery, etc) to the RAS motor.
NOTE: C
For right stroke, connect positive probe to the RAS motor con-
nector terminal 1. For left stroke, connect it to the terminal 2. SGIA1240E

5. Install rear wheel steering angle sensor with O-ring to the RAS D
actuator assembly. Temporarily tighten the mounting bolts in the specified torque that the sensor can be
moved by hand.
6. Turn and adjust the rear wheel steering angle sensor so as to make each sensor signal of "DATA MONI- E
TOR" mode to the following standard with CONSULT-II.
STEERING ANG (

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