Infiniti Q45. Manual - part 895

TROUBLE DIAGNOSIS FOR SYSTEM

STC-83

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

NOISE SUPPRESSOR

1.

Turn ignition switch “OFF”.

2.

Remove noise suppressor. Refer to 

STC-41, "Component Parts Location"

 .

3.

Check noise suppressor connector (A) continuity between the
following terminals.

4.

If NG, replace the noise suppressor.

REAR WHEEL STEERING ANGLE SENSOR

1.

Turn ignition switch “OFF”.

2.

Disconnect rear wheel steering angle sensor harness connector.

3.

Remove rear wheel steering angle sensor. 

4.

Check resistance between rear wheel steering angle sensor
connector (A) B81 terminals 1 and 3.

5.

While turning the rear wheel steering angle sensor clockwise or
counterclockwise, check rear wheel steering angle sensor con-
nector (A) B81 terminals 1 and 2, 4.

6.

When replacing rear wheel steering angle sensor, perform the
neutral position adjustment after replacing rear wheel steering
angle sensor. Refer to

STC-92, "Neutral Position"

 .

1 – 3

: Continuity should exist.

1 – 2

: Continuity should no exist.

1 – 4

: Continuity should no exist.

2 – 1

: Continuity should no exist.

2 – 3

: Continuity should no exist.

2 – 4

: Continuity should exist.

SGIA1467E

1 - 3

: 1 k

Ω

SGIA1485E

1 - 2

: 1.2 k – 1.5 k

Ω

1 - 4

: 1.2 k – 1.5 k

Ω

SGIA1486E

STC-84

[WITH REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYSTEM

POWER STEERING SOLENOID VALVE

1.

Turn ignition switch “OFF”.

2.

Disconnect power steering solenoid valve harness connector.

3.

Check resistance between power steering solenoid valve con-
nector (A) terminals 1 and 2.

4.

Check power steering solenoid valve connector (A) by listening
for its operation sound while applying battery voltage to power
steering solenoid valve connector (A) terminals 1 (positive) and
2 (negative).

5.

If NG, replace power steering solenoid valve.

STOP LAMP SWITCH

1.

Turn ignition switch “OFF”.

2.

Disconnect stop lamp switch harness connector.

3.

Remove stop lamp switch.

4.

Push and release stop lamp switch and check continuity
between stop lamp switch connector (A) M402 terminals 3 and
4.

5.

If NG, replace stop lamp switch.

1 - 2

: Approx. 4 - 6 

Ω

SGIA1412E

SGIA1419E

Terminal

Condition

Continuity

3 - 4

Push stop lamp switch

Yes

Release stop switch

No

SGIA1497E

TROUBLE DIAGNOSIS FOR SYMPTOMS

STC-85

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

TROUBLE DIAGNOSIS FOR SYMPTOMS

PFP:00007

RAS Warning Lamp Does Not Turn ON for Approx. 1 Second When The Igniting 
Switch Is Turned to ON

NGS0008S

DIAGNOSTIC PROCEDURE

1. 

CHECK SYSTEM FOR POWER SUPPLY CIRCUIT

Perform trouble diagnosis for power supply circuit. Refer to 

STC-60, "DTC C1909 CONTROL UNIT"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace damaged parts.

2. 

CHECK SYSTEM FOR RAS CONTROL UNIT

Perform trouble diagnosis for RAS control unit. Refer to 

STC-56, "DTC C1900, C1901, C1905, C1906, C1907,

C1908, C1922, C1927, C1928 CONTROL UNIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

CHECK COMBINATION METER POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter harness connector.

3.

Check voltage between combination meter harness connector
(A) terminal and ground.

4.

Turn ignition switch “ON”. (Do not start engine.)

5.

Check voltage between combination meter harness connector
(A) terminal and ground.

OK or NG

OK >> GO 

TO 

4.

NG

>> Check the following. If any items are damaged, repair or 

replace damaged parts.

●

10A fuse [No. 9, located in the fuse block (J/B) No.1].
Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

●

Harness for short or open between ignition switch and combination meter harness connector
M43 terminal 59.

●

Ignition switch. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

Connector

Terminal

Voltage (Approx.)

M43

59 - Ground

0 V

SGIA1501E

Connector

Terminal

Voltage (Approx.)

M43

59 - Ground

Battery voltage

SGIA1502E

STC-86

[WITH REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYMPTOMS

4. 

CHECK HARNESS BETWEEN RAS CONTROL UNIT AND COMBINATION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect RAS control unit harness connector and combination meter harness connector.

3.

Check continuity between RAS control unit harness connector
(A) B39 terminal 26 and combination meter harness connector
(B) M43 terminal 55.

Also check harness for short to power.

OK or NG

OK >> GO 

TO 

5.

NG

>> Repair or replace damaged parts.

5. 

CHECK RAS WARNING LAMP

1.

Turn ignition switch “OFF”.

2.

Connect combination meter harness connector.

3.

Disconnect RAS control unit harness connector.

4.

Turn ignition switch “ON”. (Do not start engine.)

5.

Ground the following terminal using suitable wiring.

–

RAS control unit harness connector (A) B39 terminal 26 and
ground.

Does RAS warning lamp turn on?

OK

>> GO TO 6.

NG

>> Replace combination meter. Refer to 

DI-23, "Removal

and Installation for Combination Meter"

 .

6. 

CHECK RAS CONTROL UNIT

Check RAS control unit input/output signal. Refer to 

STC-47, "RAS Control Unit Input/Output Signal Refer-

ence Values"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

7. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> Replace RAS control unit. Refer to 

STC-90, "Removal and Installation"

 .

Continuity should exist.

SGIA1503E

SGIA1504E