Nissan Leaf. Instruction — 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
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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