Infiniti G35 (V35) Sedan. Manual - part 1311

STC-134

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure (4WAS Main Control Unit)

INFOID:0000000000958907

1.

CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS main control unit harness connector.

3.

Check the voltage between 4WAS main control unit harness connectors and the ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS main control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 ter-

minal and the ground

• Open between the ignition switch and 4WAS main control unit harness connector No. 27 termi-

nal

• Ignition switch

2.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (1)

1.

Turn the ignition switch OFF.

2.

Remove 4WAS rear motor relay.

3.

Check the continuity between 4WAS rear motor relay harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the harnesses and connectors.

3.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (2)

Check the voltage between 4WAS rear motor relay harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 20A fuse (#37) open
- Short among 20A fuse (#37) connector, 4WAS rear motor relay harness connector No. 3 termi-

nal and the ground

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

0 V

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

B53

1 – Ground

Existed

2 – Ground

Not existed

4WAS rear motor relay

Voltage (Approx.)

Connector

Terminal

B53

3 – Ground

Battery voltage

POWER SUPPLY AND GROUND CIRCUIT

STC-135

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

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STC

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• Open between the battery and 4WAS rear motor relay harness connector No. 3 terminal

4.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3)

1.

Remove the noise suppressor.

2.

Check continuity between the noise suppressor harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace the harnesses and connectors.

5.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (4)

1.

Connect 4WAS main control unit harness connector.

2.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

3.

Check the voltage between 4WAS main control unit harness connectors.

4.

Turn the ignition switch OFF.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

6.

CHECK 4WAS REAR MOTOR RELAY

1.

Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:

• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.

2.

Check the continuity between 4WAS rear motor relay connector terminals.

3.

Check the resistance between 4WAS rear motor relay connector terminals.

Is the inspection result normal?

YES

>> GO TO 7.

Noise suppressor

Continuity

Connector

Terminal

B51

3 – Ground

Not existed

5 – Ground

B52

1 – Ground

Not existed

2 – Ground

Existed

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

25 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

Condition

B53

3 – 5

Apply the voltage between 

No. 1 terminal and No. 2 ter-

minal.

Existed

Do not apply the voltage be-

tween No. 1 terminal and 

No. 2 terminal.

Not existed

4WAS rear motor relay

Resistance (Approx.)

Connector

Terminal

B53

1 – 2

50 

Ω

STC-136

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

POWER SUPPLY AND GROUND CIRCUIT

NO

>> Replace 4WAS rear motor relay.

7.

CHECK NOISE SUPPRESSOR

Check continuity between the noise suppressor connector terminals.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace the noise suppressor.

8.

CHECK 4WAS REAR MOTOR POWER SUPPLY

1.

Connect 4WAS main control unit harness connector.

2.

Install 4WAS rear motor relay.

3.

Install the noise suppressor.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS main control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

Component Inspection (4WAS Rear Motor Relay)

INFOID:0000000000958908

1.

CHECK 4WAS REAR MOTOR RELAY

1.

Turn the ignition switch OFF.

2.

Remove 4WAS rear motor relay connector.

3.

Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:

• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.

4.

Check the continuity between 4WAS rear motor relay connector terminals.

5.

Check the resistance between 4WAS rear motor relay connector terminals.

Noise suppressor

Continuity

Connector

Terminal

Connector

Terminal

B51

3

B52

1

Existed

B51

3

B51

5

Not existed

B51

3

B52

2

Not existed

B51

5

B52

2

Existed

B51

5

B52

1

Not existed

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

37 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

Condition

B53

3 – 5

Apply the voltage between 
No. 1 terminal and No. 2 ter-
minal.

Existed

Do not apply the voltage be-
tween No. 1 terminal and 
No. 2 terminal.

Not existed

POWER SUPPLY AND GROUND CIRCUIT

STC-137

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace 4WAS rear motor relay.

Component Inspection (Noise Suppressor)

INFOID:0000000000958909

1.

NOISE SUPPRESSOR INSPECTION

1.

Turn the ignition switch OFF.

2.

Remove the noise suppressor.

3.

Check continuity between the noise suppressor connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the noise suppressor.

4WAS rear motor relay

Resistance (Approx.)

Connector

Terminal

B53

1 – 2

50 

Ω

Noise suppressor

Continuity

Connector

Terminal

Connector

Terminal

B51

3

B52

1

Existed

B51

3

B51

5

Not existed

B51

3

B52

2

Not existed

B51

5

B52

2

Existed

B51

5

B52

1

Not existed