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
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• 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
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
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
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