INFINITI M35 2006 Factory Service Manual

STC-16
[RAS]
SYSTEM DESCRIPTION
Revision: 2006 January2006 M35/M45
SYSTEM DESCRIPTIONPFP:00000
ComponentsNGS000E8
RAS (Rear Active Steer) FunctionNGS000E9
A. RAS control unit B. Model following control C. Target vehicle dynamics model
D. Rear wheel steering angle com-
mand value operationE. Rear wheel steering angle servo F. Vehicle speed signal (CAN)
G. Steering angle signal (CAN) H. Vehicle speed sensor I. Steering angle sensor
J. RAS actuator assembly
SGIA1241E
Part name Function
RAS control unit
Calculate the vehicle speed signal from CAN communication and the signals from steering
angle sensor and rear wheel steering angle sensor by a computer, and then control the rear
wheel steering angle.
Fail-safe function is activated when the electrical system is malfunctioning. The output signal
to the actuator is turned OFF during this mode. At that time, the RAS warning lamp illumi-
nates and indicates the system is malfunctioning.
It performs the communication control function with other control units via CAN communica-
tion.
This enables system diagnosis with CONSULT-II.
RAS actuatorThe efficiency of the rear wheel steer improves by locating the electric motor actuator into the
lower link of rear suspension.
Steering angle sensor
Measure the steering angle and send it to RAS control unit via CAN communication.
It is shared with the steering angle sensor for VDC.
Rear wheel steering angle sensor
It sends the rear wheel steering angle status to RAS control unit. The accuracy of rear wheel
steer improves by comparing the vehicle speed signal from CAN communication with the
rear wheel steering angle target value calculated from the wheel angle sensor signal, and it
controls them.
There are 2 types of rear wheel steering angle sensors (main/sub). If one of them is malfunc-
tioning, the other operates the fail-safe mode and stops the control.
RAS warning lamp
It turns on when the fail-safe function is operated and indicates that a RAS control malfunc-
tion has occurred.
It turns on when ignition switch turns on and turns off after the engine is started.
It indicates the suspect system by blinking when performing the self-diagnosis (without CON-
SULT-II).

SYSTEM DESCRIPTION
STC-17
[RAS]
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STC
Revision: 2006 January2006 M35/M45
Fail-Safe FunctionNGS000EA
In the event there is a malfunction with the electrical system, the RAS control is stopped and the fail-safe
mode is activated. At that time, it indicates the malfunction by turning the RAS warning lamp ON and stops the
rear wheel control.

STC-18
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
TROUBLE DIAGNOSISPFP:00004
How to Perform Trouble DiagnosisNGS000EB
BASIC CONCEPT
The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.
It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
they will be necessary to check symptom by driving vehicle with
customer.
CAUTION:
Customers are not professionals. Do not assume “maybe
customer means...” or “maybe customer mentioned this
symptom”.
It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
After diagnosis, make sure to perform “ERASE MEMORY”.
Refer to STC-29, "
How to Erase Self-Diagnostic Results" .
Always read “GI General Information” to confirm general precau-
tions. Refer to GI-9, "
HOW TO USE THIS MANUAL" .
EFJ0028D
SEF233G

TROUBLE DIAGNOSIS
STC-19
[RAS]
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STC
Revision: 2006 January2006 M35/M45
Component Parts LocationNGS000EC
A. RAS warning lamp B. Steering angle sensor C. RAS control unit
D. RAS motor relay E. RAS motor F. Rear wheel steering angle sensor
G. Noise suppressor
SGIA1053J

STC-20
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
SchematicNGS000ED
TGWT0025E

TROUBLE DIAGNOSIS
STC-21
[RAS]
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STC
Revision: 2006 January2006 M35/M45
Wiring Diagram — RAS —NGS000EE
TGWT0026E

STC-22
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
TGWT0027E

TROUBLE DIAGNOSIS
STC-23
[RAS]
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STC
Revision: 2006 January2006 M35/M45
TGWT0028E

STC-24
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
TGWT0029E

TROUBLE DIAGNOSIS
STC-25
[RAS]
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STC
Revision: 2006 January2006 M35/M45
TGWT0030E