Nissan Versa Sedan. Manual — part 104

COMPONENT PARTS

BRC-9

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Component Description

INFOID:0000000009267585

ABS Actuator and Electric Unit (Control Unit)

INFOID:0000000009267586

Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS func-

tion, ABS function and EBD function.

ELECTRIC UNIT (CONTROL UNIT)

• Brake fluid pressure is 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 (Main Relay)

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

ABS IN Valve

Switches the fluid pressure line to increase or hold according to signals from control unit.

ABS OUT Valve

1

ABS actuator and electric unit (con-
trol unit)

2

IPDM E/R

3

Brake fluid level switch
(view with IPDM E/R removed)

4

Front wheel sensor

5

Rear wheel sensor

6

VDC OFF switch

7

Steering angle sensor
(view with steering wheel and spiral
cable removed)

8

Stop lamp switch

9

Parking brake switch
(view with console removed)

10

Combination meter (type A)

11

Combination meter (type B)

Component

Reference/Function

ABS actuator and electric unit (control unit)

BRC-9, "ABS Actuator and Electric Unit (Control Unit)"

Wheel sensor

BRC-10, "Wheel Sensor and Sensor Rotor"

Stop lamp switch

BRC-10, "Stop Lamp Switch"

Steering angle sensor

BRC-10, "Steering Angle Sensor"

VDC OFF switch

BRC-10, "VDC OFF Switch"

Brake fluid level switch

BRC-11, "Brake Fluid Level Switch"

Parking brake switch

BRC-11, "Parking Brake Switch"

ABS warning lamp

BRC-12, "VDC/TCS/ABS : System Description"

Brake warning lamp

VDC OFF indicator lamp

SLIP indicator lamp

ECM

Transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal

TCM

Transmits the current gear position signal to ABS actuator and electric unit (control
unit) via CAN communication.

BRC-10

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

COMPONENT PARTS

Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.

Cut Valve 1, Cut Valve 2

Shuts off the ordinary brake line from master cylinder, when VDC function and TCS function are activated.

Suction Valve 1, Suction Valve 2

Supplies the brake fluid from master cylinder to the pump, when VDC function and TCS function are activated.

Return Check Valve

Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each

valve when brake is released.

Reservoir

Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when

decreasing pressure of brake caliper and wheel cylinder.

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) via communication lines.

• Vehicle rotation angular velocity (yaw rate signal)

• Vehicle lateral acceleration (side G signal) and longitudinal acceleration (decel G signal)

Pressure Sensor

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

Wheel Sensor and Sensor Rotor

INFOID:0000000009267587

NOTE:

• 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 back plate of rear brake.

• Sensor rotor of rear wheel is installed on rear brake drum.

• Never measure resistance and voltage value using a tester because sensor is active sensor.

• Downsize and weight reduction is aimed. IC for detection portion

and magnet for sensor rotor are adopted.

• 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.

Stop Lamp Switch

INFOID:0000000009267588

Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-

tric unit (control unit).

Steering Angle Sensor

INFOID:0000000009267589

Detects the following information and transmits steering angle signal to ABS actuator and electric unit (control

unit) via CAN communication.

• Steering wheel rotation amount

• Steering wheel rotation angular velocity

• Steering wheel rotation direction

VDC OFF Switch

INFOID:0000000009267590

• Non-operational status or standby status of VDC and TCS 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 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).

JPFIC0131GB

COMPONENT PARTS

BRC-11

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Brake Fluid Level Switch

INFOID:0000000009267591

Detects the brake fluid level in reservoir tank and transmits converted electric signal from combination meter to

ABS actuator and electric unit (control unit) via CAN communication.

Parking Brake Switch

INFOID:0000000009267592

Detects the operation status of parking brake switch and transmits converted electric signal from combination

meter to ABS actuator and electric unit (control unit) via CAN communication.

BRC-12

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

SYSTEM

VDC/TCS/ABS
VDC/TCS/ABS : System Diagram

INFOID:0000000009267593

VDC/TCS/ABS : System Description

INFOID:0000000009267594

• The system switches fluid pressure of each brake caliper and each wheel cylinder 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, TCS, ABS and EBD functions.

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

occurs.

INPUT SIGNAL AND OUTPUT SIGNAL

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

AWFIA0806GB