Infiniti FX35, FX50 (S51). Manual - part 1780

C1915, C1916 REAR WHEEL STEERING ANGLE SENSOR

STC-61

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

1.

Start the engine.

2.

Perform the self-diagnosis. Refer to 

STC-38, "Diagnosis Description"

.

Is DTC “C1915”, “C1916” or “RAS warning lamp flickering pattern:24” detected?

YES

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

NO

>> GO TO 7.

7.

CHECK INFORMATION

With CONSULT-III

1.

Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.

2.

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

STC-

89, "Reference Value"

.

Is each data standard?

YES

>> Check pin terminal and connection of each harness connector for non-standard conditions.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

Component Inspection

INFOID:0000000005549692

1.

CHECK REAR WHEEL STEERING ANGLE SENSOR

1.

Turn the ignition switch OFF.

2.

Disconnect rear wheel steering angle sensor harness connector.

3.

Check the resistance between rear wheel steering angle sensor connector.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

Special Repair Requirement

INFOID:0000000005549693

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after

diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

Rear wheel steering angle sensor

Resistance (Approx.)

Terminal

1

4

1  k

Ω

1 

2

1.2 – 1.5 k

Ω

1 

3

1.2 – 1.5 k

Ω

STC-62

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR

C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR

Description

INFOID:0000000005549694

• It detects the steering angle condition of rear wheel.
• 2 systems (main and sub sensor) are equipped.

DTC Logic

INFOID:0000000005549695

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Without CONSULT-III

1.

Start the engine.

2.

Perform the self-diagnosis. Refer to 

STC-38, "Diagnosis Description"

.

Is DTC “C1917”, “C1918” or “RAS warning lamp flickering pattern:24” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-62, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549696

1.

CHECK REAR WHEEL STEERING ANGLE SENSOR (1)

With CONSULT-III

1.

 Start the engine.

CAUTION:

Check condition with the vehicle stopped.

2.

Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.

3.

Check “RR ST ANG-MAI” and “RR ST ANG-SUB” item on “DATA MONITOR” of RAS control unit.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

2.

CHECK REAR WHEEL STEERING ANGLE SENSOR (2)

Check the voltage between RAS control unit harness connector and ground.

DTC

Display items

Malfunction detected condition

Possible cause

C1917

RR ST ANGLE SENSOR
[OFFSET SIG1]

The output signal value differs temporarily between 
rear wheel steering angle sensor (main) and (sub).

• RAS actuator assembly 

(Rear wheel angle sen-
sor)

• Harness or connector
• RAS control unit

C1918

RR ST ANGLE SENSOR
[OFFSET SIG2]

The output signal value differs between rear wheel 
steering angle sensor (main) and (sub).

• RAS actuator assembly 

(Rear wheel angle sen-
sor)

• Harness or connector
• RAS control unit

Monitored item

Condition

Display value

RR ST ANG-MAI

Straight-ahead

Approx. 2.4 V

RR ST ANG-SUB

Straight-ahead

Approx. 2.6 V

C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR

STC-63

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is the differential between terminal voltage No. 4 and No.7 approximately 1 V or more?

YES 

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

NO

>> GO TO 3.

3.

CHECK REAR WHEEL STEERING ANGLE SENSOR (3)

Check the rear wheel steering angle sensor. Refer to 

STC-64, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

4.

CHECK REAR WHEEL STEERING ANGLE SENSOR GROUND CIRCUIT

1.

Disconnect RAS control unit harness connector.

2.

Check for continuity between RAS control unit harness connector terminal and rear wheel steering angle
sensor harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace each harness and connector.

5.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Without CONSULT-III

1.

Start the engine.

2.

Perform the self-diagnosis. Refer to 

STC-38, "Diagnosis Description"

.

Is DTC “C1917”, “C1918” or “RAS warning lamp flickering pattern:24” detected?

YES

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

NO

>> GO TO 6.

6.

CHECK INFORMATION

With CONSULT-III

1.

Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.

2.

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

STC-

89, "Reference Value"

.

Is each data standard?

YES

>> Check pin terminal and connection of each harness connector for non-standard conditions.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

RAS control unit

—

Voltage (Approx.)

Connector

Terminal

B37

4 

Ground

2.4 V

7 2.6 

V

RAS control unit

Rear wheel steering angle sensor

Continuity

Connector

Terminal

Connector

Terminal

B37

4

B53

1, 2, 4

Not existed

4

3

Existed

7

1, 3, 4

Not existed

7

2

Existed

5

2, 3, 4

Not existed

5

1

Existed

15

1, 2, 3

Not existed

15

4

Existed

STC-64

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1917, C1918 REAR WHEEL STEERING ANGLE SENSOR

Component Inspection

INFOID:0000000005549697

1.

CHECK REAR WHEEL STEERING ANGLE SENSOR (3)

1.

Turn the ignition switch OFF.

2.

Disconnect rear wheel steering angle sensor harness connector.

3.

Check resistance between rear wheel steering angle sensor connector.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

Special Repair Requirement

INFOID:0000000005549698

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after

diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

Rear wheel steering angle sensor

Resistance (Approx.)

Terminal

1 4

1 

k

Ω

1

2

1.2 – 1.5 k

Ω

1 

3

1.2 – 1.5 k

Ω