Nissan Leaf. Manual - part 173

 

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Nissan Leaf. Manual - part 173

 

 

COMPONENT PARTS

BR-13

< SYSTEM DESCRIPTION >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

Stroke Sensor

INFOID:0000000010122982

Detects the amount that the brake pedal is depressed and sends it to

the electrically-driven intelligent brake unit.

Warning Buzzer

INFOID:0000000010122983

The warning buzzer operates based on the signal from the electri-

cally-driven intelligent brake unit to notify the driver of the change in

power supply circuits.

Brake Power Supply Backup Unit

INFOID:0000000010122985

When there is a malfunction in the power system of the electrically-

driven intelligent brake unit (no voltage is generated), this unit tem-

porarily supplies voltage to the electrically-driven intelligent brake

unit.

JSFIA1134ZZ

JSFIA1135ZZ

JSFIA1644ZZ

BR-14

< SYSTEM DESCRIPTION >

SYSTEM

SYSTEM

System Description

INFOID:0000000010122986

• An electrically-driven intelligent brake is a booster system that generates assist force by using an internal

motor to operate a piston inside the master cylinder.

• Control module is integrated with electrically-driven intelligent brake unit.

• When the brake pedal is depressed during driving, cooperative control of the braking force from the friction

brake (regular brake) and the regenerative brake from the traction motor is used.

• The system performs cooperative control of the regenerative brake and friction brake (same brake as in con-

ventional vehicles) and enables highly efficient energy recovery.

• The fluid pressure which is applied to each brake caliper is controlled according to the amount of traction

motor regeneration. 

• The amount of brake pedal operation is detected by the stroke sensor, and sent to the control module of the

electrically-driven intelligent brake unit.

• Based on the commands from the control module of the electrically-driven intelligent brake unit, the motor

inside the electrically-driven intelligent brake unit operates and presses the master cylinder piston.

• Pressing the master cylinder piston, and brake fluid is sent to the ABS actuator and electric unit (control

unit).

• CONSULT can be used to diagnose the system diagnosis.

• When there is a malfunction in the power system of the electrically-driven intelligent brake unit (no voltage is

generated), voltage is temporarily supplied to the electrically-driven intelligent brake unit from the brake

power supply backup unit. At the same time, the brake warning lamp (red) and brake system warning lamp

(yellow) turn ON, and the warning buzzer sounds.

• When a malfunction occurs in the electrically-driven intelligent brake unit, the VDC function performs control

(boost operation). At the same time, the brake warning lamp (red) and brake system warning lamp (yellow)

turn ON.

• When a malfunction occurs in the PDM (Power Delivery Module) and 12V battery, the braking force is deter-

mined by the force pressing on the brake pedal (no boost operation). At the same time, the brake warning

lamp (red) and the brake system warning lamp (yellow) turn ON.

• When a malfunction occurs in the brake power supply backup unit, the brake system warning lamp (yellow)

turn ON.

• When a malfunction occurs in the electrically-driven intelligent brake and in the VDC function, the braking

force is determined by the force pressing on the brake pedal (no boost operation). At the same time, the

brake warning lamp (red) and brake system warning lamp (yellow) turn ON.

• When a malfunction occurs in the electrically-driven intelligent brake, the VDC function, and the power sys-

tem, then cooperative regenerative brake control is not performed.

• A fail-safe function is available and is activated when a system malfunction occurs. Refer to 

BR-16, "Fail-

Safe"

.

SYSTEM DIAGRAM 

SYSTEM

BR-15

< SYSTEM DESCRIPTION >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

INPUT SIGNAL AND OUTPUT SIGNAL 

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

JSFIA2283GB

Component

Signal description

ABS actuator and electric unit (control unit)

Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN 
communication and brake communication (CAN communication).
• ABS actuator and electric unit (control unit) control signal
• Vehicle speed signal (ABS)
• Decel G signal
• Front LH wheel speed signal
• Rear LH wheel speed signal
• Front RH wheel speed signal
• Rear RH wheel speed signal
• Yaw rate signal
• Side G signal
• VDC malfunction signal
• VDC OFF switch signal
• Master cylinder fluid pressure signal
Mainly receives the following signals from electrically-driven intelligent brake unit via CAN 
communication and brake communication (CAN communication).
• Electrically-driven intelligent brake control signal
• Brake assist request signal
• Brake power supply backup operation signal
• Brake power supply backup operation request signal
• Brake warning lamp request signal
• Brake system warning lamp request signal

VCM

Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN 
communication.
• VCM control signal
• Current regenerative torque signal
• VCM status signal
• Shift position signal
Mainly receives the following signal from electrically-driven intelligent brake unit via CAN 
communication.
• Target braking force signal

BR-16

< SYSTEM DESCRIPTION >

SYSTEM

CONDITION FOR OPERATION OF THE WARNING LAMP AND THE WARNING BUZZER

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

Fail-Safe

INFOID:0000000010122987

• When there is a malfunction in the power system of the electrically-driven intelligent brake unit (no voltage is

generated), voltage is temporarily supplied to the electrically-driven intelligent brake unit from the brake

power supply backup unit. At the same time, the brake warning lamp (red) and brake system warning lamp

(yellow) turn ON and the buzzer sounds.

• When a malfunction occurs in the electrically-driven intelligent brake unit, the VDC function performs control

(boost operation).

• When a malfunction occurs in the PDM (Power Delivery Module) and 12V battery, the braking force is deter-

mined by the force pressing on the brake pedal (no boost operation). At the same time, brake warning lamp

(red) and the brake system warning lamp (yellow) turn ON.

• When a malfunction occurs in the brake power supply backup unit, the brake system warning lamp (yellow)

turn ON.

• When a malfunction occurs in the electrically-driven intelligent brake and in the VDC function, the braking

force is determined by the force pressing on the brake pedal (no boost operation). At the same time, the

brake warning lamp (red) and brake system warning lamp (yellow) turn ON.

• When a malfunction occurs in the electrically-driven intelligent brake, VDC function, and power system,

cooperative regenerative brake control is not performed.

BCM

Mainly transmits the following signals to electrically-driven intelligent brake unit via CAN 
communication.
• Sleep wake up signal
• Power switch ON signal
• Door switch signal

Steering angle sensor

Mainly transmits the following signal to electrically-driven intelligent brake unit via CAN 
communication.
• Steering angle sensor signal

Combination meter

Mainly receives the following signals from ABS actuator electric unit (control unit) via elec-
trically-driven intelligent brake unit via CAN communication.
• Brake warning lamp signal
• Brake system warning lamp signal

Component

Signal description

Condition (status)

Brake warning lamp 

(red)

Brake system warn-

ing lamp (yellow)

Warning buzzer

Power switch OFF

OFF

OFF

OFF

For several seconds after the power switch is ON

ON

ON

OFF

Several seconds after power switch ON (when the system is in 
normal operation)

OFF

OFF

OFF

When the power supply of the electrically-driven intelligent brake 
is changed to the brake power supply backup unit

ON

ON

ON

Brake power supply backup unit is malfunctioning

OFF

ON

OFF

Electrically-driven intelligent brake is malfunctioning

ON

ON

OFF

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

ON

OFF

OFF

DTC

Vehicle condition

C1A60

The following functions are suspended.
• Boost operation by the electrically-driven intelligent brake
• Cooperative regenerative brake control
• Power supply from the brake power supply backup unit

C1A61

C1A62

C1A63

The following function is suspended.
• Power supply from the brake power supply backup unit

 

 

 

 

 

 

 

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