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Infiniti FX35, FX50 (S51). Manual - part 1776

C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT

STC-45

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

STC

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

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace the harnesses and connectors.

CHECK RAS MOTOR

Check RAS motor. Refer to

STC-46, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 3.

>> Replace RAS actuator assembly. Refer to

STC-110, "Exploded View"

PERFORM ACTIVE TEST

With CONSULT-III

Connect RAS control unit harness connector.

Connect RAS motor harness connector.

Perform “SELF DIAGNOSTIC MODE” item on “ACTIVE TEST” of “4WAS(MAIN)/RAS/HICAS”.

CAUTION:

Perform the active test while vehicle is stopped.

Check “MOTOR VOLTAGE”, “MOTOR CURRENT” and “MTR CRNT OPE” while performing the active
test.

Without CONSULT-III

Disconnect RAS control unit harness connector.

Disconnect RAS motor harness connector.

Start the engine.

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

RAS control unit

RAS motor

Continuity

Connector

Terminal

Connector

Terminal

B37

B54

Existed

RAS control unit

—

Continuity

Connector

Terminal

B37

Ground

Not existed

Monitor item

Condition

Display value

MOTOR VOLTAGE

Ignition switch: ON

Battery voltage

MOTOR CURRENT

RAS motor running

0 – 20 A

MTR CRNT OPE

RAS actuator neutral condition and vehicle
straight-ahead position

Approx.

−

2 – 2 A

RAS motor running

Approx.

−

20 – 20 A

STC-46

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT

Is the standard value?

YES

>> GO TO 4.

>> Replace RAS actuator assembly. Refer to

STC-110, "Exploded View"

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Turn the ignition switch ON.

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

Without CONSULT-III

Connect RAS control unit harness connector.

Connect RAS motor harness connector.

Start the engine.

Perform the self-diagnosis. Refer to

STC-38, "Diagnosis Description"

Is DTC “C1902”, “C1903”, “C1904”, “C1910” or “RAS warning lamp flickering pattern:13” detected?

YES

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

>> GO TO 5.

CHECK INFORMATION

With CONSULT-III

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

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.

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

Component Inspection

INFOID:0000000005549668

CHECK RAS MOTOR

Turn the ignition switch OFF.

Disconnect RAS motor harness connector.

Check the continuity between RAS motor connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace RAS actuator assembly. Refer to

STC-110, "Exploded View"

Special Repair Requirement

INFOID:0000000005549669

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

RAS control unit

—

Condition

Voltage (Approx.)

Connector

Terminal

B37

Ground

While RAS motor is opera-
tion for right

Battery voltage

While RAS motor is opera-
tion for left

While RAS motor is opera-
tion for right

While RAS motor is opera-
tion for left

Battery voltage

RAS motor

Continuity

Terminal

1 – 2

Existed

C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT

STC-47

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

STC

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”.

STC-48

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1905, C1908, C1922, C1925, C1928 RAS CONTROL UNIT

C1905, C1908, C1922, C1925, C1928 RAS CONTROL UNIT

Description

INFOID:0000000005549670

• RAS actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical

components are malfunctioning.

• The protective function stops RAS system temporarily when the input signal is not inputted to RAS control

unit (When battery-power dose not work temporarily).

DTC Logic

INFOID:0000000005549671

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC REPRODUCTION PROCEDURE

With CONSULT-III

Turn the ignition switch from OFF to ON.

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

Without CONSULT-III

Start the engine.

Perform the self-diagnosis. Refer to

STC-38, "Diagnosis Description"

Is DTC “C1905”, “C1908”, “C1922”, “C1925”, “C1928” or “RAS warning lamp flickering pattern:11” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-48, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549672

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Turn the ignition switch from OFF to ON.

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

Without CONSULT-III

Start the engine.

Perform the self-diagnosis. Refer to

STC-38, "Diagnosis Description"

Is DTC “C1905”, “C1908”, “C1922”, “C1925”, “C1928” or “RAS warning lamp flickering pattern:11” detected?

YES

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

>> GO TO 2.

CHECK INFORMATION

With CONSULT-III

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

DTC

Display items

Malfunction detected condition

Possible cause

C1905

CONTROL UNIT
[ABNORMAL3]

Malfunction has occurred inside RAS control unit.