Infiniti G35 (V35) Sedan. Manual - part 1321

STC-174

< SYMPTOM DIAGNOSIS >

[WITH 4WAS]

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)

Description

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• The steering force does not change smoothly according to the vehicle speed.
- The steering force is heavy when steering.
- The steering force is light when driving at high speed.

Diagnosis Procedure

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1.

CHECK 4WAS SYSTEM VEHICLE SPEED SIGNAL

Perform the trouble diagnosis of the vehicle speed signal. Refer to 

STC-110, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the specific malfunctioning part.

2.

CHECK STEERING SYSTEM

Check the steering system. Refer to 

ST-12, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the specific malfunctioning part.

3.

CHECK 4WAS SYSTEM POWER STEERING SOLENOID VALVE

Perform the trouble diagnosis of the power steering solenoid valve. Refer to 

STC-138, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Repair or replace the specific malfunctioning part.

PRECAUTIONS

STC-175

< PRECAUTION >

[WITH 4WAS]

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PRECAUTION

PRECAUTIONS

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

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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:

• 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 performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SRS section.

• 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 har-
ness connectors.

Precaution Necessary for Steering Wheel Rotation after Battery Disconnect

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NOTE:
• Before removing and installing any control units, first turn the push-button ignition switch to the LOCK posi-

tion, then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both

battery cables.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

This vehicle is equipped with a push-button ignition switch and a steering lock unit.
If the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure
below before starting the repair operation.

OPERATION PROCEDURE

1.

Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.

2.

Carry the Intelligent Key or insert it to the key slot and turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)

3.

Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.

4.

Perform the necessary repair operation.

5.

When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)

6.

Perform self-diagnosis check of all control units using CONSULT-III.

Precautions for Removal and Installation of 4WAS Components

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• Set the vehicle to the straight-ahead position when checking 4WAS and removing each component.
• Remove the battery terminal 10 minutes after turning the ignition switch OFF from ON and perform the

removal of each component when removing the 4WAS front control unit.

STC-176

< PRECAUTION >

[WITH 4WAS]

PRECAUTIONS

• Perform the neutral position adjustment for the steering angle sensor after the replacement of steering angle

sensor. Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Special

Repair Requirement"

.

• Refer to 

STC-27, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Description"

 for the

replacement of 4WAS front control unit.

• Refer to 

STC-27, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Description"

 for the

replacement of 4WAS front actuator.

Precautions for Harness Repair

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4WAS COMMUNICATION LINE

• Solder the repaired area and wrap tape around the soldered area.

NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause 4WAS communication error as
spliced wires that are separate from the main line or twisted lines
lose noise immunity. 

• Replace the applicable harness as an assembly if error is detected

on the shield lines of 4WAS communication line.

SKIB8766E

SKIB8767E

4WAS FRONT CONTROL UNIT

STC-177

< ON-VEHICLE REPAIR >

[WITH 4WAS]

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ON-VEHICLE REPAIR

4WAS FRONT CONTROL UNIT

Exploded View

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Removal and Installation

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REMOVAL

1.

Turn the ignition switch OFF.

2.

Remove the instrument driver lower panel. Refer to 

IP-11, "Exploded View"

.

3.

Disconnect 4WAS front control unit connectors.

CAUTION:

Disconnect 4WAS front control unit connectors 10 minutes after turning the ignition switch OFF. 

4.

Remove the bolts of 4WAS front control unit.

5.

Remove the 4WAS front control unit (1).

INSTALLATION

Note following, and install in the reverse order of removal.
• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to 

STC-28, "4WAS

FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"

.

1.

4WAS front control unit

:Vehicle front

Refer to 

GI-4, "Components"

 for symbols in the figure.

JSGIA0057ZZ

JSGIA0058ZZ