Infiniti G37 Coupe. Manual - part 1243

PRECAUTIONS

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< PRECAUTION >

[WITHOUT 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 AIRBAG” and “SEAT BELT” of this
Service Manual.

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 AIRBAG”.

• 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.

STC-24

< ON-VEHICLE REPAIR >

[WITHOUT 4WAS]

POWER STEERING CONTROL UNIT

ON-VEHICLE REPAIR

POWER STEERING CONTROL UNIT

Exploded View

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Removal and Installation

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REMOVAL

1.

Remove glove box assembly. Refer to 

IP-11, "Exploded View"

.

2.

Remove power steering control unit screws.

3.

Remove power steering control unit (1).

4.

Disconnect power steering control unit connector.

INSTALLATION

Install in the reverse order of removal.

1.

Power steering control unit

: Vehicle front

JSGIA0129ZZ

JSGIA0130ZZ

DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

[WITH 4WAS]

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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DETAILED FLOW

1.

INTERVIEW FROM THE CUSTOMER

It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.

CAUTION:

Customers are not professional. It is dangerous to make an easy guess like “maybe the customer
means that...,” or “maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK SYMPTOM

Start the engine.

CAUTION:

Stop the vehicle.

Does 4WAS warning lamp turn ON?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC detected other than “C1930” or “C1931”?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

PERFORM TROUBLE DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT-III

1.

Check the error system detected from the self-diagnosis.

CAUTION:

Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function.

2.

Erase 4WAS main control unit self-diagnosis memory.

CAUTION:

• Never erase the self-diagnosis result (record) history when replacing 4WAS main control unit.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

>> GO TO 5.

5.

PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT AND 4WAS MAIN CONTROL UNIT)

With CONSULT-III

1.

Perform 4WAS front control unit self-diagnosis.

2.

Check the error system detected from the self-diagnosis.

CAUTION:

Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function.

3.

Erase 4WAS front control unit self-diagnosis memory.

CAUTION:

• Never erase the self-diagnosis result (record) history when replacing 4WAS front control unit.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

4.

Perform 4WAS main control unit self-diagnosis.

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< BASIC INSPECTION >

[WITH 4WAS]

DIAGNOSIS AND REPAIR WORKFLOW

5.

Check the error system detected from the self-diagnosis.

CAUTION:

Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function.

6.

Erase 4WAS main control unit self-diagnosis memory.

CAUTION:

• Never erase the self-diagnosis result (record) history when replacing 4WAS main control unit.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

>> GO TO 6.

6.

CHECK TERMINAL

Check each harness connector pin terminal for disconnection.

>> GO TO 7.

7.

CHECK SYMPTOM REPRODUCTION

With CONSULT-III

Perform DTC reproduction procedure for the error system.

Is any error system detected?

YES

>> GO TO 2.

NO

>> GO TO 8.

8.

PERFORM SYMPTOM DIAGNOSIS

With CONSULT-III

Perform the symptom diagnosis for each system.

Is any error detected?

YES

>> GO TO 2.

NO

>> GO TO 9.

9.

FINAL CHECK

With CONSULT-III

Check input/output signal standard of 4WAS front control unit and 4WAS main control unit.
Is the input/output the standard value?

YES

>> INSPECTION END

NO

>> GO TO 2.