Infiniti FX35, FX50 (S51). Manual - part 1779

C1914 REAR WHEEL STEERING ANGLE SENSOR

STC-57

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

YES

>> GO TO 3.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

3.

CHECK REAR WHEEL STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect RAS control unit harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the harnesses and connectors.

4.

PERFORM SELF-DIAGNOSIS

1.

Connect RAS control unit harness connector.

2.

Connect the rear wheel steering angle sensor harness connector.

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 “C1914” or “RAS warning lamp flickering pattern:24” detected?

YES

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

NO

>> GO TO 5.

5.

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 the standard value?

YES

>> Check each harness connector pin terminal for disconnection.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

Component Inspection

INFOID:0000000005549687

1.

CHECK REAR WHEEL STEERING ANGLE SENSOR

1.

Turn the ignition switch OFF.

2.

Disconnect the rear wheel steering angle sensor harness connector.

3.

Check the resistance between the rear wheel steering angle sensor connector.

Is the inspection result normal?

YES

>> INSPECTION END

RAS control unit

Rear wheel steering angle sensor

Continuity

Connector

Terminal

Connector

Terminal

B37

5

B53

1

Existed

5

4

Not existed

15

4

Existed

15

1

Not existed

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-58

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1914 REAR WHEEL STEERING ANGLE SENSOR

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

Special Repair Requirement

INFOID:0000000005549688

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”.

C1915, C1916 REAR WHEEL STEERING ANGLE SENSOR

STC-59

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1915, C1916 REAR WHEEL STEERING ANGLE SENSOR

Description

INFOID:0000000005549689

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

DTC Logic

INFOID:0000000005549690

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

YES

>> Proceed to diagnosis procedure. Refer to 

STC-59, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549691

1.

CHECK RAS REAR ACTUATOR

1.

Turn the ignition switch OFF.

2.

Measure (A) and (B) of RAS actuator assembly as shown in the
figure.

Is the differential of (A) and (B) 5.8 mm (0.228 in) or less?

YES

>> GO TO 2.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110,

"Exploded View"

.

2.

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”.

DTC

Display items

Malfunction detected condition

Possible cause

C1915

RR ST ANGLE SENSOR
[MAIN SIGNAL]

The rear wheel angle sensor signal (main) output signal 
is malfunction.

• RAS actuator assembly 

(Rear wheel angle sen-
sor)

• Harness or connector
• RAS  control  unit

C1916

RR ST ANGLE SENSOR
[SUB SIGNAL]

The rear wheel angle sensor signal (sub) output signal 
is malfunction.

• RAS actuator assembly 

(Rear wheel angle sen-
sor)

• Harness or connector
• RAS  control  unit

JSGIA0086ZZ

STC-60

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1915, C1916 REAR WHEEL STEERING ANGLE SENSOR

3.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

3.

CHECK REAR WHEEL STEERING ANGLE SENSOR (2)

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

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 4.

4.

CHECK REAR WHEEL STEERING ANGLE SENSOR (3)

1.

Check the rear wheel steering angle sensor. Refer to 

STC-61, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace RAS actuator assembly. Refer to 

STC-110, "Exploded View"

.

5.

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 and rear wheel steering angle sensor
harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace each harness and connector.

6.

PERFORM SELF-DIAGNOSIS

1.

Connect RAS control unit harness connector.

2.

Connect the rear wheel steering angle sensor harness connector.

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

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

Without CONSULT-III

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

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