Infiniti FX35, FX50 (S51). Manual - part 1787

RAS CONTROL UNIT

STC-89

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

C

D

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STC

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ECU DIAGNOSIS INFORMATION

RAS CONTROL UNIT

Reference Value

INFOID:0000000005235456

VALUES ON THE DIAGNOSIS TOOL

Monitor item

Content

Condition

Value/Status

VHCL SPEED SE

Wheel speed

Vehicle stopped

0 km/h (0 MPH)

Start the engine. Wait a minute. Drive the ve-
hicle.

CAUTION:

Check air pressure of tire under standard 
condition.

Approximately equal to 

the indication on speed-
ometer (Inside of 

±

10%)

STEERING ANG

Steering angle detected by 
steering angle sensor

Steering wheel turned right

0

°

 

−

 R756

°

Straight-ahead

Approx. 0

°

Steering wheel turned left

0

°

 

−

 L756

°

ENGINE SPEED

Engine speed

Engine stopped

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately equal to 

the indication on tachom-

eter

POWER STR SOL 

Monitored value of current at 
power steering solenoid valve

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

Approx. 1.10 A

Vehicle speed: 100 km/h (62 MPH)

Approx. 0.42 A

RR ST ANG-MAI

Rear wheel steering angle 
(main) sensor output voltage

RAS actuator assembly turns right com-
pletely

Approx. 4.4 V

RAS actuator assembly is neutral

Approx. 2.4 V

RAS actuator assembly turns left completely

Approx. 0.4 V

RR ST ANG-SUB

Rear wheel steering angle (sub) 
sensor output voltage

RAS actuator assembly turns right com-
pletely

Approx. 4.4 V

RAS actuator assembly is neutral

Approx. 2.4 V

RAS actuator assembly turns left completely

Approx. 0.4 V

RR ST ANG-VOL

Rear wheel steering angle sen-
sor input voltage

Ignition switch: ON

Approx. 5 V

Ignition switch: OFF

0 V

C/U VOLTAGE

Power supply voltage for RAS 
control unit

Ignition switch: ON

Battery voltage

Ignition switch: OFF

—

MOTOR VOLTAGE

Monitored value of voltage at 
RAS motor

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

MOTOR CURRENT 

Monitored value of current at 
RAS motor

RAS motor running

Approx. 0 

−

 20 A

MTR CRNT OPE

Current commanded value to 
RAS motor

RAS motor running

Approx. 

−

20 

−

 20 A

RR ANGLE OPE

Rear wheel steering angle de-
tected by rear wheel steering 
angle sensor

RAS actuator assembly turned right

Approx. 0 

−

1

°

RAS actuator assembly is neutral

Approx. 0

°

RAS actuator assembly turned left

Approx. 0 

−

 

−

1

°

STOP LAMP SW 

Stop lamp condition

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

HICAS RELAY

RAS motor relay condition

Ignition switch: ON

ON

Ignition switch: OFF

OFF

STC-90

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

RAS CONTROL UNIT

TERMINAL LAYOUT

PHYSICAL VALUES

FAIL SAFE

Fail-safe condition

Fail-safe condition

ON

Normal

OFF

WARNING LAMP

RAS warning lamp condition

RAS warning lamp: ON

ON

RAS warning lamp: OFF

OFF

Monitor item

Content

Condition

Value/Status

SGIA1449E

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

1

(L)

—

CAN-H

—

—

—

4

(Y)

Ground

Rear wheel steering angle 
sensor (main) output volt-
age

Output

RAS actuator assembly turns right com-
pletely.

4.4 V

RAS actuator assembly is neutral

2.4 V

RAS actuator assembly turns left com-
pletely.

0.4 V

5

(W)

Ground

Rear wheel steering angle 
sensor power supply

Output

Ignition switch: ON

5 V

Ignition switch: OFF

0 V

7

(R)

Ground

Rear wheel steering angle 
sensor (sub) output voltage

Output

RAS actuator assembly turns right com-
pletely.

4.4 V

RAS actuator assembly is neutral

2.6 V

RAS actuator assembly turns left com-
pletely.

0.4 V

8

(P)

—

CAN-L

—

—

—

15

(G)

Ground

Ground
(Rear wheel steering angle 
sensor)

—

Always

0  V

22

(GR)

Ground

Stop lamp switch

Input

Brake pedal: Depressed

Battery voltage

Brake pedal: Released

0 V

25

(SB)

Ground

RAS motor relay

Output

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

27

(G)

Ground

Ignition switch

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

34

(GR)

Ground

Ground

—

Always

0 V

RAS CONTROL UNIT

STC-91

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

CAUTION:

When using circuit tester to measure voltage for inspection, never forcibly extend any connector terminals.

36

(LG)

Ground

Power steering solenoid 
valve

Output

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

4.4 – 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 – 3.6 V

37

(P)

Ground

RAS motor power supply

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

38

(G/Y)

Ground

RAS motor output voltage
(right)

Output

While RAS motor activates rightward

Battery voltage

While RAS motor activates leftward

0 V

39

(G/R)

Ground

RAS motor output voltage
(left)

Output

While RAS motor activates rightward

0 V

While RAS motor activates leftward

Battery voltage

40

(B)

Ground

Ground
(RAS motor) 

—

Always

0  V

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

STC-92

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

RAS CONTROL UNIT

Wiring Diagram - RAS SYSTEM -

INFOID:0000000005612695

JCGWA0243GB