Nissan Versa Note. Manual - part 114

BRC-20

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

CONDITIONS FOR INDICATOR LAMP ILLUMINATION

• Turns ON when VDC and TCS functions are switched to non-operational status (OFF) by VDC OFF switch.

• Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.

CONDITIONS FOR WARNING LAMP ILLUMINATION

Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.

Component

Function

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).

Cut valve 1
Cut valve 2

Shuts off the ordinary brake line from master cylinder.

Suction valve 1
Suction valve 2

Supplies the brake fluid from master cylinder to the pump.

ABS IN valve

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

ABS OUT valve

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

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 decreas-
es when decreasing pressure of brake caliper and wheel cylinder.

Pressure sensor

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

Condition (status)

VDC OFF indicator lamp

SLIP indicator lamp

Ignition switch OFF

OFF

OFF

For approx. 1 second after the ignition switch 
is turned ON

ON

ON

Approx. 1 second after ignition switch is 
turned ON (when the system is in normal op-
eration)

OFF

OFF

When VDC OFF switch is ON (VDC function 
and TCS function are OFF)

ON

OFF

VDC function is malfunctioning

OFF

ON

TCS function is malfunctioning

OFF

ON

Condition (status)

ABS warning lamp

Brake warning lamp

Ignition switch OFF

OFF

OFF

For approx. 1 second after the ignition switch 
is turned ON

ON

ON

Approx. 1 second after ignition switch is 
turned ON (when the system is in normal op-
eration)

OFF

OFF

After engine starts

OFF

OFF

When parking brake operates (parking brake 
switch ON)

OFF

ON

When brake fluid is less than the specified 
level (brake fluid level switch ON)

OFF

ON

VDC function is malfunctioning

OFF

OFF

TCS function is malfunctioning

OFF

OFF

ABS function is malfunctioning

ON

OFF

EBD function is malfunctioning

ON

ON

Brake limited slip differential (BLSD) function 
is malfunctioning

OFF

OFF

SYSTEM

BRC-21

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

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VDC/TCS/ABS : VDC Function

INFOID:0000000009364890

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

• Side slip or tail slip may occur while driving on a slippery road or intending an urgent evasive driving maneu-

ver. VDC function detects side slip status using each sensor when side slip or tail slip is about to occur and

improves vehicle stability by brake control and engine output control during driving.

• In addition to ABS function, EBD function and TCS function, target side slip amount is calculated according

to steering operation amount from steering angle sensor. By comparing this information with vehicle side slip

amount that is calculated from information from yaw rate/side G sensor and wheel sensor, vehicle driving

conditions (conditions of understeer or oversteer) are judged and vehicle stability is improved by brake force

control on all 4 wheels and engine output control.

• VDC function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case,

VDC OFF indicator lamp turns ON.

• Control unit portion automatically improves driving stability by performing brake force control as well as

engine output control, by transmitting drive signal to actuator portion according to difference between target

side slip amount and vehicle side slip amount 

VDC function is operating

OFF

OFF

TCS function is operating

OFF

OFF

Condition (status)

ABS warning lamp

Brake warning lamp

AWFIA0807GB

JSFIA0672GB

BRC-22

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

• Brake force control function at braking hard detects driver

′s brake operations with the pressure sensor,

judges a brake booster

′s maximum brake power function by using information from the vacuum sensor, and

enhances more powerful braking force by controlling brakes of four wheels.

• VDC warning lamp blinks while VDC function is in operation and indicates to the driver that the function is in

operation.

• CONSULT can be used to diagnose the system.

• Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC

function and TCS function. However, ABS function and EBD function operate normally. Refer to 

BRC-38,

"Fail-safe"

.

INPUT SIGNAL AND OUTPUT SIGNAL

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

OPERATION CHARACTERISTICS

VDC Function That Prevents Oversteer Tendency

• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the outer

side of turn. Momentum is generated directing the vehicle toward the outer side of the turn. Oversteer is pre-

vented.

• Changing driving lane on a slippery road, when there may be a tendency to oversteer, engine output is con-

trolled as well as brake force (brake fluid pressure) of 4 wheels. Oversteer tendency decreases.

Component

Signal description

ECM

Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Acceleration 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.

Steering angle sensor

Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via 
CAN communication.

Combination meter

Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal

ALFIA0339GB

ALFIA0340GB

SYSTEM

BRC-23

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

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VDC Function That Prevents Understeer Tendency

• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the inner

side of turn. Momentum is generated directing the vehicle toward the inner side of the turn. Understeer is

prevented.

• Applying brakes during cornering on a slippery road, when there may be a tendency to understeer, engine

output is controlled as well as brake force (brake fluid pressure) of 4 wheels. Understeer tendency

decreases.

VDC/TCS/ABS : TCS Function

INFOID:0000000009364891

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

JPFIC0137GB

ALFIA0341GB

AWFIA0807GB