Infiniti M35/M45 Y50. Manual - part 1119

TROUBLE DIAGNOSIS

STC-33

[RAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

3. 

CHECK RAS CONTROL UNIT POWER SUPPLY CIRCUIT

Turn ignition switch ON, and then check voltage between RAS con-
trol unit harness connector B476 and ground.

OK or NG

OK

>> Power supply and ground circuit are normal.

NG

>> Power supply circuit open or shorted. Repair or replace

any inoperative parts.

Trouble Diagnosis Chart

NGS000EP

SELF-DIAGNOSIS

Terminal 27 – Ground

: Battery voltage (Approx. 12 V)

SGIA1245E

Item

Reference

Self-diagnosis function

CONSULT-II

DTC

(warning 

lamp blinks)

Diagnosis item

Diagnosis item

11

RAS control unit

CONTROL UNIT [ABNORMAL1] [C1900]

STC-35

CONTROL UNIT [ABNORMAL2] [C1901]

CONTROL UNIT [ABNORMAL3] [C1905]

CONTROL UNIT [ABNORMAL5] [C1906]

CONTROL UNIT [ABNORMAL4] [C1907]

CONTROL UNIT [ABNORMAL7] [C1908]

CONTROL UNIT [ABNORMAL6] [C1909]

CONTROL UNIT [ABNORMAL8] [C1922]

CONTROL UNIT [ABNORMAL5] [C1927]

CONTROL UNIT [ABNORMAL9] [C1928]

12

Motor power supply

MOTOR VOLTAGE [LOW VOLTAGE] [C1911]

STC-35

MOTOR VOLTAGE [BAD OBSTRCT] [C1912]

13

Motor output

MOTOR OUTPUT [ABNORMAL SIG] [C1913]

STC-37

MOTOR OUTPUT [REV CURRENT] [C1902]

MOTOR OUTPUT [NO CURRENT] [C1903]

MOTOR OUTPUT [OVERCURRENT] [C1904]

MOTOR OUTPUT [MOTOR LOCK] [C1910]

21

Vehicle speed signal

VEHICLE SPEED SEN [NO SIGNAL] [C1919]

STC-38

22

Steering angle signal

STEERING ANGLE SEN [NO CHANGE] [C1923]

STC-39

STEERING ANGLE SEN [NO NEUT STATE] [C1924]

STEERING ANGLE SEN [NO SIGNAL] [C1920]

STEERING ANGLE SEN [C1926]

STC-34

[RAS]

TROUBLE DIAGNOSIS

DIAGNOSIS CHART BY SYMPTOM

24

Rear wheel steering angle (main)

RR ST ANGLE SENSOR [MAIN SIGNAL] [C1915]

STC-40

RR ST ANGLE SENSOR [ABNORMAL VOL] [C1914]

RR ST ANGLE SENSOR [OFFSET SIG1] [C1917]

RR ST ANGLE SENSOR [OFFSET SIG2] [C1918]

25

Rear wheel steering angle (sub)

RR ST ANGLE SENSOR [SUB SIGNAL] [C1916]

RR ST ANGLE SENSOR [ABNORMAL VOL] [C1914]

RR ST ANGLE SENSOR [OFFSET SIG1] [C1917]

RR ST ANGLE SENSOR [OFFSET SIG2] [C1918]

26

VDC

VDC [C1929]

STC-43

33

Engine speed signal

MOTOR OUTPUT [C1921]

STC-44

—

CAN COMM CIRCUIT [U1000]

STC-44

—

CONTROL UNIT (CAN) [U1010]

Symptom

Reference

It is not entering the self-diagnosis mode.

STC-32, "BASIC INSPECTION 3: RAS CONTROL UNIT POWER 
SUPPLY CIRCUIT AND GROUND CIRCUIT INSPECTION"

STC-45, "Inspection 10: Stop Lamp Switch Harness"

STC-46, "Inspection 11: RAS Warning Lamp Harness"

RAS warning lamp does not turn on with ignition switch ON.

STC-32, "BASIC INSPECTION 3: RAS CONTROL UNIT POWER 
SUPPLY CIRCUIT AND GROUND CIRCUIT INSPECTION"

STC-46, "Inspection 11: RAS Warning Lamp Harness"

RAS warning lamp turns on with ignition switch ON. It does not 
turn off even if the engine is started.

STC-32, "Basic Inspection"

●

STC-28, "SELF-DIAG RESULT MODE"

●

STC-31, "Diagnosis Procedure with Self-Diagnosis Function 
(Without CONSULT-II)"

RAS warning lamp may turn on after the engine is started.

STC-28, "SELF-DIAG RESULT MODE"

The steering force does not change smoothly according to the 
vehicle speed.

STC-47, "Diagnosis Chart by Symptom 2"

Noise

●

STC-28, "SELF-DIAG RESULT MODE"

●

STC-31, "Diagnosis Procedure with Self-Diagnosis Function 
(Without CONSULT-II)"

STC-14, "INSPECTION AFTER DISASSEMBLY"

Malfunction other than above

STC-47, "Diagnosis Chart by Symptom 1"

TROUBLE DIAGNOSIS

STC-35

[RAS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

Inspection 1: RAS Control Unit Malfunction

NGS000EQ

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

With CONSULT-II

Without CONSULT-II

Is above displayed on self-diagnosis display?

YES

>> Replace RAS control unit. Perform self-diagnosis again after replacing.

NO

>> INSPECTION END

Inspection 2: Motor Power Supply System

NGS000ER

1. 

CHECK RAS CONTROL UNIT CONNECTOR

1.

Turn ignition switch OFF, disconnect RAS control unit harness connector and RAS motor harness connec-
tor, and check terminal for deformation, disconnection, looseness, etc.

2.

Reconnect harness connector securely, and perform self-diagnosis.

With CONSULT-II

Without CONSULT-II

Is above displayed on self-diagnosis display?

YES

>> GO TO 2.

NO

>> Connector terminal connection is loose, damaged, open, or shorted. Repair or replace the termi-

nal.

Self-diagnostic results

CONTROL UNIT [ABNORMAL1] [C1900]

CONTROL UNIT [ABNORMAL2] [C1901]

CONTROL UNIT [ABNORMAL3] [C1905]

CONTROL UNIT [ABNORMAL5] [C1906]

CONTROL UNIT [ABNORMAL4] [C1907]

CONTROL UNIT [ABNORMAL7] [C1908]

CONTROL UNIT [ABNORMAL6] [C1909]

CONTROL UNIT [ABNORMAL8] [C1922]

CONTROL UNIT [ABNORMAL5] [C1927]

CONTROL UNIT [ABNORMAL9] [C1928]

DTC (warning lamp blinks)

11

Self-diagnosis results

MOTOR VOLTAGE [LOW VOLTAGE] [C1911]

MOTOR VOLTAGE [BAD OBSTRCT] [C1912]

DTC (warning lamp blinks)

12

STC-36

[RAS]

TROUBLE DIAGNOSIS

2. 

CHECK RAS MOTOR RELAY BATTERY CIRCUIT

1.

Turn ignition switch OFF, and disconnect RAS motor relay harness connector B480.

2.

Check voltage between RAS motor relay harness connector
B480 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> RAS motor relay power supply circuit open or shorted.

Repair or replace power supply circuit and fuse.

3. 

CHECK RAS MOTOR RELAY HARNESS

1.

Disconnect RAS motor relay harness connector B480 and RAS control unit harness connector B476.

2.

Check continuity between RAS motor relay harness connector
B480 and RAS control unit harness connector B476.

3.

Check continuity between RAS motor relay harness connector
B480 and ground.

OK or NG

OK

>> GO TO 4.

NG

>> RAS motor relay harness open or shorted. Repair or replace applicable malfunctioning harness.

4. 

CHECK RAS MOTOR RELAY RESISTANCE

Check the resistance between RAS motor relay connector.

OK or NG

OK

>> GO TO 5.

NG

>> RAS motor relay malfunction (replacement)

Terminal 3 – Ground

: Battery voltage (Approx. 12 V)

SGIA1246E

Terminal 5 – 37

: Continuity should exist.

Terminal 1 – 25

: Continuity should exist.

2 – Ground

: Continuity should exist.

SGIA1265E

Terminal 1 – 2

: Approx. 74 

Ω

SGIA1266E