Infiniti Q45. Manual - part 882

PRECAUTIONS

STC-31

[WITH REAR ACTIVE STEER]

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B

STC

[WITH REAR ACTIVE STEER]

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT 
BELT PRE-TENSIONER”

NGS0006I

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

●

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

●

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

●

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions

NGS0006J

●

Before connecting or disconnecting the RAS control unit
harness connector, turn ignition switch “OFF” and discon-
nect the battery cable from the negative terminal. Battery
voltage is applied to RAS control unit even if ignition switch
is turned “OFF”.

●

When connecting or disconnecting pin connectors into or
from RAS control unit, take care not to damage pin termi-
nals (bend or break).
When connecting pin connectors make sure that there are
not any bends or breaks on RAS control unit pin terminals.

●

Before replacing RAS control unit, perform RAS control
unit input/output signal inspection and make sure whether
RAS control unit functions properly or not. Refer to 

STC-47,

"RAS Control Unit Input/Output Signal Reference Values"

 .

SEF289H

SEF291H

SDIA1848E

STC-32

[WITH REAR ACTIVE STEER]

PRECAUTIONS

Precautions for RAS Actuator Assembly and Rear Wheel Steering Angle Sensor 
Replacement 

NGS000CW

When removing the RAS motor or rear wheel steering angle sensor from the RAS actuator assembly, perform
neutral position adjustment of RAS actuator assembly. Refer to 

STC-92, "Neutral Position"

 .

ELECTRICALLY CONTROLLED POWER STEERING

STC-33

[WITH REAR ACTIVE STEER]

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STC

ELECTRICALLY CONTROLLED POWER STEERING

PFP:49810

Power Steering Control Diagram

NGS000CR

Operation Principle

NGS000CX

DURING PARKING (WHEN TURNING THE STEERING WHEEL TO THE RIGHT.)

1.

Power steering solenoid valve is closed while a vehicle is stopped.

2.

Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.

3.

Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurred in “2R” and “3R”. This
results in a light steering force because of high pressure.

1.

Speed sensor

2.

RAS control unit

3.

Power steering solenoid valve

4.

Steering gear assembly

5.

Gear housing assembly

6.

Gear sub-assembly

7.

Pinion

8.

Power steering oil pump

9.

Reservoir tank

SGIA1389E

SGIA1583E

STC-34

[WITH REAR ACTIVE STEER]

ELECTRICALLY CONTROLLED POWER STEERING

DURING HIGH-SPEED OPERATION

1.

Power steering solenoid valve is opened during high-speed operation.

2.

Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.

3.

Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.

4.

Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a
heavy steering force.

System Description

NGS000CN

DESCRIPTION

●

Electrically controlled power steering system is controlled by RAS control unit.

●

The system controls power steering solenoid valve by changing supply current to the power steering sole-
noid valve depending on vehicle speed.

POWER STEERING SOLENOID VALVE

●

Vehicle speed sensing electronically controlled power steering
(that properly controls the steering force by the vehicle speed)
has been adopted. When it is normal, it controls the power
steering solenoid valve according to the vehicle speed as shown
in the figure and makes the steering force proper.

●

Power steering solenoid valve becomes full throttle when the
power steering solenoid valve voltage is 2.5 V, and totally-
enclosed when the voltage is 5.5 V.

CONTROL UNIT

The RAS control unit (1) controls power steering solenoid valve.

SGIA1584E

SST696CA

SGIA1444E