2007 INFINITI M35 Factory Service Manual

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Page 4449 of 4647

INFINITI M35 2007 Factory Service Manual STC-10
[EPS]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
3. CHECK POWER STEERING CONTROL UNIT POWER SUPPLY CIRCUIT
Turn ignition switch ON, and then check voltage between power
steering control

Page 4450 of 4647

INFINITI M35 2007 Factory Service Manual TROUBLE DIAGNOSIS
STC-11
[EPS]
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Revision: 2007 April2007 M35/M45
4. CHECK POWER STEERING SOLENOID VALVE POWER SUPPLY CIRCUIT
Check continuity between power steering control u

Page 4451 of 4647

INFINITI M35 2007 Factory Service Manual STC-12
[EPS]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
7. CHECK VEHICLE SPEED SIGNAL CIRCUIT
Change the vehicle speed, and then check voltage waveform
between power steering control unit harn

Page 4452 of 4647

INFINITI M35 2007 Factory Service Manual REAR ACTIVE STEER
STC-13
[RAS]
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Revision: 2007 April2007 M35/M45
[RAS]REAR ACTIVE STEERPFP:55705
Removal and InstallationNGS000E5
COMPONENTS
REMOVAL
1. Remove coil spring. Re

Page 4453 of 4647

INFINITI M35 2007 Factory Service Manual STC-14
[RAS]
REAR ACTIVE STEER
Revision: 2007 April2007 M35/M45
Disassembly and AssemblyNGS000E6
COMPONENTS
DISASSEMBLY
1. Remove mounting bolts of RAS motor assembly, and then remove RAS motor assemb

Page 4454 of 4647

INFINITI M35 2007 Factory Service Manual REAR ACTIVE STEER
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Revision: 2007 April2007 M35/M45
4. Supply 6 V voltage by connecting the four 1.5 V batteries in a
series. Connect them to the RAS motor conne

Page 4455 of 4647

INFINITI M35 2007 Factory Service Manual STC-16
[RAS]
SYSTEM DESCRIPTION
Revision: 2007 April2007 M35/M45
SYSTEM DESCRIPTIONPFP:00000
ComponentsNGS000E8
RAS (Rear Active Steer) FunctionNGS000E9
A. RAS control unit B. Model following control

STC-16
[RAS]
SYSTEM DESCRIPTION
Revision: 2007 April2007 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).

Page 4456 of 4647

INFINITI M35 2007 Factory Service Manual SYSTEM DESCRIPTION
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Revision: 2007 April2007 M35/M45
Fail-Safe FunctionNGS000EA
In the event there is a malfunction with the electrical system, the RAS control i

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