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. Information necessary to service the system safely is included in the “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution for Procedure without Cowl Top Cover

INFOID:0000000010508859

When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc to prevent damage to
windshield.

Precaution for Brake System

INFOID:0000000010329773

WARNING:

Since dust covering the front and rear brakes has an affect on human body, the dust must be removed
with a dust collector. Never splatter the dust with an air blow gun.
• Brake fluid use refer to

MA-59, "Fluids and Lubricants"

• Never reuse drained brake fluid.
• Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it off

immediately and wash with water if it gets on a painted surface.

• Never use mineral oils such as gasoline or light oil to clean. They may damage rubber parts and cause

improper operation.

• Always loosen the brake tube flare nut with a flare nut wrench.

PIIB3706J

BRC-6

< PRECAUTION >

[WITH ESP]

PRECAUTIONS

• Tighten the brake tube flare nut to the specified torque with crow-

foot (A) and torque wrench (B).

• Always confirm the specified tightening torque when installing the

brake pipes.

• Turn the ignition switch OFF and disconnect the ABS actuator and

electric unit (control unit) harness connector or the battery negative
terminal before performing the work.

• Check that no brake fluid leakage is present after replacing the

parts.

Precaution for Brake Control

INFOID:0000000010329774

• When starting engine or when starting vehicle just after starting engine, brake pedal may vibrate or motor

operating noise may be heard from engine compartment. This is normal condition.

• When an error is indicated by ABS or another warning lamp, collect all necessary information from customer

(what symptoms are present under what conditions) and check for estimate causes before starting diagnos-
tic servicing. Besides electrical system inspection, check brake booster operation, brake fluid level, and oil
leaks.

• If tire size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,

stopping distance or steering stability may deteriorate.

• ABS might be out of order or malfunctions by putting a radio (wiring inclusive), an antenna and a lead-in wire

near the control unit.

• ESP system may not operate normally or a ESP warning lamp may light.
- When replacing the following parts with parts other than genuine parts or making modifications: Suspension-

related parts (shock absorber, spring, bushing, etc.), tires, wheels (other than specified sizes), brake-related
parts (pad, rotor, caliper, etc.), engine-related parts (muffler, ECM, etc.) and body reinforcement-related parts
(roll bar, tower bar, etc.).

- When driving with worn or deteriorated suspension, tires and brake-related parts.

Precautions for Harness Repair

INFOID:0000000010329775

COMMUNICATION LINE

• Solder the repaired area and wrap tape around the soldered area.

NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause communication error as spliced
wires that are separate from the main line or twisted lines lose
noise immunity.

• Replace the applicable harness as an assembly if error is detected

on the shield lines of communication line.

JPFIA0001ZZ

SKIB8766E

SKIB8767E

PREPARATION

BRC-7

< PREPARATION >

[WITH ESP]

BRC

PREPARATION

Special Service Tool

INFOID:0000000010329776

The actual shapes of the tools may differ from those illustrated here.

Commercial Service Tools

INFOID:0000000010329777

Tool number
(TechMate No.)
Tool name

Description

KV991J0080
(J-45741)
ABS active wheel sensor tester

Checking operation of ABS active wheel sen-
sors

WFIA0101E

Tool name

Description

1. Flare nut crowfoot
2. Torque wrench

Removing and installing brake piping
a: 10 mm (0.39 in)/12 mm (0.47 in)

Power tool

Loosening nuts, screws and bolts

S-NT360

PIIB1407E

BRC-8

< SYSTEM DESCRIPTION >

[WITH ESP]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000010329778

E1FIA0156ZZ

COMPONENT PARTS

BRC-9

< SYSTEM DESCRIPTION >

[WITH ESP]

BRC

Wheel Sensor and Sensor Rotor

INFOID:0000000010329779

NOTE:

Steering column (view with steering
wheel removed)

Right side of instrument panel (view
with instrument panel removed)

Left side of engine compartment

Right side of engine compartment

Left front wheel area

Instrument panel area

Left side of instrument panel

Left rear wheel area

No.

Component parts

Function

Steering angle sensor

BRC-11, "Steering Angle Sensor"

Chassis control module

Mainly transmits the following signals to ABS actuator and electric unit (con-
trol unit) via CAN communication.
• Drive mode signal
• Active Trace Control signal
• Brake hold status signal
• Brake hold request signal
Refer to

GI-4, "Components"

for detailed installation location.

Brake fluid level switch

BRC-11, "Brake Fluid Level Switch"

Vacuum sensor

BRC-12, "Vacuum Sensor"

ABS actuator and electric unit (control unit)

BRC-10, "ABS Actuator and Electric Unit (Control Unit)"

Front LH wheel sensor

BRC-9, "Wheel Sensor and Sensor Rotor"

Parking brake switch

BRC-12, "Parking Brake Switch"

VDC OFF switch

BRC-12, "VDC OFF Switch"

Parking sonar switch

BRC-12, "Parking Brake Switch"

Rear LH wheel parking brake actuatorsensor

PB-11, "Parking Brake Actuator"

Rear LH wheel sensor

BRC-9, "Wheel Sensor and Sensor Rotor"

E1FIA0164ZZ

BRC-10

< SYSTEM DESCRIPTION >

[WITH ESP]

COMPONENT PARTS

• Wheel sensor of front wheel is installed on steering knuckle.
• Sensor rotor of front wheel is integrated in wheel hub assembly.
• Wheel sensor of rear wheel is installed on rear final drive.
• Sensor rotor of rear wheel is installed on drive shaft (rear final drive

side).

• Never measure resistance and voltage value using a tester

because sensor is active sensor.

• Power supply is supplied to detection portion so that magnetic field

line is read. Magnetic field that is detected is converted to current
signal.

• When sensor rotor rotates, magnetic field changes. Magnetic field

change is converted to current signals (rectangular wave) and is
transmitted to ABS actuator and electric unit (control unit). Change
of magnetic field is proportional to wheel speed.

ABS Actuator and Electric Unit (Control Unit)

INFOID:0000000010329780

Electric unit (control unit) is integrated with actuator and comprehen-
sively controls VDC function, TCS function, ABS function, EBD func-
tion, Brake limited slip differential (BLSD) function, Brake assist
function, hill start assist function and Brake force distribution func-
tion.

ELECTRIC UNIT (CONTROL UNIT)

• Brake fluid pressure, engine and transmission are controlled according to signals from each sensor.
• If malfunction is detected, the system enters fail-safe mode.

ACTUATOR

The following components are integrated with ABS actuator.

Pump

Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.

Motor

Activates the pump according to signals from ABS actuator and electric unit (control unit).

Motor Relay

Operates the motor ON/OFF according to signals from ABS actuator and electric unit (control unit).

Actuator Relay

Operates each valve ON/OFF according to signals from ABS actuator and electric unit (control unit).

ABS IN Valve and ABS OUT Valve

Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and
electric unit (control unit).

Pressure Sensor

Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).

JSFIA1272ZZ

JPFIC0131GB

ALFIA0427ZZ

COMPONENT PARTS

BRC-11

< SYSTEM DESCRIPTION >

[WITH ESP]

BRC

Cut Valve 1 (Primary Line), Cut Valve 2 (Secondary Line)

Shuts off the ordinary brake line from master cylinder, when VDC function, TCS function, Brake limited slip dif-
ferential (BLSD) function, Brake assist function, hill start assist function and Brake force distribution function
are activated.

Yaw Rate/Side/Decel G Sensor

Calculates the following information that affects the vehicle, and transmits a signal to ABS actuator and elec-
tric unit (control unit). [Yaw rate/side/decel G sensor is integrated in ABS actuator and electric unit (control
unit).]
• Vehicle rotation angular velocity (yaw rate signal)
• Vehicle lateral acceleration (side G signal)
• Vehicle longitudinal acceleration (decel G signal)

Stop Lamp Switch

INFOID:0000000010329781

Detects the operation status of brake pedal and transmits converted
electric signal to ABS actuator and electric unit (control unit).

Steering Angle Sensor

INFOID:0000000010329782

Detects the following information and transmits steering angle signal
to ABS actuator and electric unit (control unit) via CAN communica-
tion.
• Steering angle sensor malfunction signal
• Steering wheel rotation amount
• Steering wheel rotation angular velocity
• Steering wheel rotation direction

Brake Fluid Level Switch

INFOID:0000000010329783

Detects the brake fluid level in reservoir tank and transmits con-
verted electric signal from combination meter to ABS actuator and
electric unit (control unit) via CAN communication, when brake fluid
level is the specified level or less.

JSFIA1143ZZ

ALFIA0428ZZ

ALFIA0429ZZ

BRC-12

< SYSTEM DESCRIPTION >

[WITH ESP]

COMPONENT PARTS

Vacuum Sensor

INFOID:0000000010329784

Detects the vacuum in brake booster and transmits converted elec-
tric signal to ABS actuator and electric unit (control unit).

Parking Brake Switch

INFOID:0000000010329785

Detects the operation status of parking brake switch and transmits
converted electric signal from combination meter to ABS actuator
and electric unit (control unit).

VDC OFF Switch

INFOID:0000000010329786

• This is an integrated switch with switches for other functions.
• Non-operational status or standby status of the following functions

can be selected using VDC OFF switch. VDC OFF indicator lamp
indicates the operation status of function. (ON: Non-operational
status, OFF: Standby status)

- VDC function
- TCS function
- Active trace control function
NOTE:
ABS function, EBD function and Brake limited slip differential (BLSD)
function control operates.
• VDC OFF indicator lamp turns OFF (standby status) when the

engine is started again after it is stopped once while VDC OFF
indicator lamp is ON (non-operational status).

ALFIA0433ZZ

E1FIA0159ZZ

ALFIA0430ZZ

SYSTEM

BRC-13

< SYSTEM DESCRIPTION >

[WITH ESP]

BRC

SYSTEM

System Description

INFOID:0000000010329788

• The system switches fluid pressure of each brake caliper to increase, to hold or to decrease according to

signals from control unit in ABS actuator and electric unit (control unit). This control system is applied to
VDC function, TCS function, ABS function, EBD function, brake limited slip differential (BLSD) function,
brake assist function, hill start assist function and Brake force distribution function.

• Fail-safe function is available for each function and is activated by each function when system malfunction

occurs.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

ALFIA0419GB

Component

Signal description

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine torque signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Engine torque request signal

TCM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Current gear position signal

Chassis control module

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Active trace control signal

BRC-14

< SYSTEM DESCRIPTION >

[WITH ESP]

SYSTEM

VALVE OPERATION (ABS AND EBD)

Each valve is operated and fluid pressure of brake caliper is controlled.

When ordinary brake is applied and ABS is in operation (when pressure increases).

When front RH wheel caliper pressure increases

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Brake fluid level switch signal
• Parking brake switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Brake warning lamp signal
• ABS warning lamp signal
• VDC warning lamp signal
• VDC OFF indicator lamp signal

Steering angle sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Steering angle sensor signal
• Steering angle sensor malfunction signal

Component

Signal description

JPFIC0159GB

Name

Not activated

When Pressure Increases

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

ABS IN valve

Power supply is not supplied (open)

ABS OUT valve

Power supply is not supplied (close)

Each caliper (fluid pressure)

—

Pressure increases

SYSTEM

BRC-15

< SYSTEM DESCRIPTION >

[WITH ESP]

BRC

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, pressurized brake fluid is supplied to front RH caliper through ABS IN valve.

When front LH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, pressurized brake fluid is supplied to front LH wheel caliper through ABS IN valve.

When rear RH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, pressurized brake fluid is supplied to rear RH wheel caliper through ABS IN valve.

When rear LH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, pressurized brake fluid is supplied to rear LH wheel caliper through ABS IN valve.

When ABS operation starts (when pressure holds)

When front RH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

When front LH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

JPFIC0160GB

Name

Not activated

When pressure holds

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Each caliper (fluid pressure)

—

Pressure holds

BRC-16

< SYSTEM DESCRIPTION >

[WITH ESP]

SYSTEM

When rear RH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

When rear LH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

ABS is in operation (when pressure decreases)

When front RH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When front LH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When rear RH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When rear LH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

Component Parts and Function

JPFIC0161GB

Name

Not activated

When pressure decreases

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Power supply is supplied (open)

Each caliper (fluid pressure)

—

Pressure decreases

Content .. 1 2 ..