GENERAL INFORMATION

OUTLINE OF CHANGE

Due to the addition of electric parking brake, the service procedure has been established.

ELECTRIC PARKING BRAKE

CONSTRUCTION DIAGRAM

Item		Number	Outline of function
Sensor	Electric parking brake switch	1	Sends a signal to the electric parking brake ECU to apply and release the electric parking brake.
Sensor	Brake auto hold switch	2	The electric parking brake ECU provides the ASC-ECU with the brake auto hold switch ON/OFF information.
CAN bus signal	Shift information	-	Detects which range the selector lever is in, and sends a signal to the electric parking brake ECU via CAN bus lines.
	Accelerator pedal position sensor	-	Detects how deeply the accelerator pedal is depressed, and sends a signal to the electric parking brake ECU via CAN bus lines.
	Engine torque	-	Is provided to the electric parking brake ECU via the CAN bus lines.
	Engine speed	-	Is provided to the electric parking brake ECU via the CAN bus lines.
	Wheel speed sensor	-	Detects the speed of road wheels, and sends a signal to the electric parking brake ECU via CAN bus lines.
	G sensor	-	Is incorporated in the ASC-ECU, detects longitudinal acceleration, and sends a signal to the electric parking brake ECU via CAN bus lines.
	Master cylinder fluid pressure sensor	-	Sends a signal to the electric parking brake ECU via the CAN bus lines. The system determines whether the brake pedal is depressed or not by using the signal.
	Brake auto hold switch indicator illumination request signal	-	Is provided to the electric parking brake ECU via the CAN bus lines.
	Coding information	-	Is sent to the electric parking brake ECU via the CAN bus lines.
	Ignition switch status	-	Is provided to the electric parking brake ECU via the CAN bus lines.
	Odometer reading	-	Is sent to the electric parking brake ECU via the CAN bus lines.
	Driver’s seat belt fastened or unfastened	-	Is sent to the electric parking brake ECU via the CAN bus lines.
Actuator	Electric parking brake actuator	3	Activates the electric motor in accordance with the command from the electric parking brake ECU to regulate the parking brake.
	Electric parking brake switch indicator lamp	4	Informs the driver of the system status by flash, illuminating or turning off the indicator lamp according to the signal from electric parking brake ECU.
	Brake auto hold switch indicator lamp	5	The electric parking brake ECU activates or deactivates the brake auto hold switch indicator lamp according to the request sent by the ASC-ECU.
	Combination meter	6	Receives a signal from the electric parking brake ECU, and triggers the warning lamp, the multi-information display or the buzzer to alert the driver of the system status.
Diagnosis connector		-	Outputs the diagnosis codes and allows communication with the M.U.T.-III.
Electric parking brake ECU		7	Controls actuators (described above) based on the signals coming from each sensor.
			Controls the self-diagnostics and fail-safe functions.
			Controls the diagnostic function (M.U.T.-III compatible).

SYSTEM CONFIGURATION DIAGRAM

note

Dashed lines indicate the CAN bus communication lines.

SENSORS

ELECTRIC PARKING BRAKE SWITCH

The electric parking brake switch is located on the front floor console panel. When the electric parking brake switch is operated regardless of the ignition switch, the electric parking brake is activated.

To apply (lock) the electric parking brake

1.Pull up the electric parking brake switch with the brake pedal depressed.
2.When the parking brake is applied, the brake warning lamp and the indicator lamp on the electric parking brake switch will illuminate.

note

When the ignition switch is other than ON, if the parking brake is applied, the electric parking brake switch indicator lamp comes on for a while.
When parking on sharp grades, pull up the electric parking brake switch twice (once more after the operation is completed once). The maximum effect of the parking brake will be obtained.

To apply the electric parking brake during driving (Emergency brake)

caution

Use the emergency brake only in emergency. By the excessive use of the brake, the brake parts are possibly worn early and the brake is disabled by the overheat.

1.When you cannot avoid collision by depressing the brake pedal, you can allow the ASC-ECU to activate an emergency braking (brake all four wheels) by pulling the electric parking brake switch

note

Just in case the ASC-ECU fails, the electric parking brake ECU will brake the rear wheels only instead.

2.While holding it, the brake is applied. At this time, the warning display appears with a buzzer sound, but you should continue to pull and hold the electric parking brake switch.

To release the electric parking brake

1.Turn ON the ignition switch, and press the electric parking brake switch with the brake pedal depressed.

note

When you depress the accelerator pedal, the electric parking brake will be disengaged automatically. For details, refer to "Automatic operation".

2.When the parking brake is released, the brake warning lamp and the indicator lamp on the electric parking brake switch will go out.

note

When the ignition switch is other than ON, the parking brake cannot be released.

BRAKE AUTO HOLD SWITCH

The brake auto hold switch (indicator) is located on the front floor console panel.
1.The electric parking brake ECU provides the ASC-ECU with the brake auto hold switch ON/OFF information. The ASC-ECU controls the brake auto hold function according to the ON/OFF information. For details, refer to GROUP 35C - General Information

.
2.The electric parking brake ECU activates or deactivates the brake auto hold switch indicator lamp according to the request sent by the ASC-ECU.

ACTUATORS

ELECTRIC PARKING BRAKE ACTUATOR

The electric parking brake actuator, which incorporates an electric motor, regulates the parking brake by actuating the electric motor.
If the electric parking brake fails due to a flat battery or any other reason, it can be released by operating the electric parking brake actuator manually (Refer to ).

ELECTRIC PARKING BRAKE SWITCH INDICATOR LAMP AND COMBINATION METER

The electric parking brake ECU illuminates the indicator lamp on the electric parking brake switch as described in the table below.
The electric parking brake ECU illuminates the warning lamp on the combination meter as described in the table below. In addition, the ECU displays a warning notice on the multi-information display in the combination meter.

Warning lamp, indicator lamp and multi information display illumination pattern

State	Brake warning lamp	Electric parking brake warning lamp	Multi information display	Electric parking brake switch indicator lamp
For approximately 3 seconds after the ignition switch is turned ON (Initial check for the warning lamp).	Illuminates	Illuminates	-	-
The electric parking brake is applied	Illuminates^*1	-	-	Illuminates*1
The electric parking brake is applied during driving (Emergency brake) ^*2	Illuminates	-	RELEASE PARKING BRAKE	Illuminates
The vehicle is held stationary by the electric parking brake instead of the ASC-ECU (brake auto hold mode).	-	-	PARKING BRAKE ENGAGED	-
The electric parking brake is released	-	-	-	-
The driver attempted to release the electric parking brake without depressing the brake pedal when the selector lever is not in P range.	Illuminates	-	PRESS BRAKE PEDAL TO RELEASE	Illuminates
The driver attempted to start the vehicle without releasing the electric parking brake.	Illuminates	-	RELEASE PARKING BRAKE	Illuminates
The automatic operation works when the driver’s seat belt is not fastened.	-	-	RELEASE PARKING BRAKE	-
The overheat protection mode for electric motor is triggered	-	-	PARKING BRAKE TEMPORARILY NOT AVAILABLE	-
The maintenance mode is entered.	-	-	PARKING BRAKE SERVICE REQUIRED	-

note

^*1: When the ignition switch is other than ON, if the parking brake is applied, the electric parking brake switch indicator lamp comes on for a while. The brake warning lamp does not come on.
^*2: The buzzer (incorporated in the combination meter) sounds.
: For how the warning lamp, the indicator lamp and the multi-information display work when a malfunction occurs, refer to the relevant Workshop Manual.

ELECTRIC PARKING BRAKE ECU

The electric parking brake ECU determines the vehicle status according to the electric parking brake switch signal and CAN communication, and regulates the parking brake by actuating the electric parking brake actuator.
The electric parking brake ECU supports self-diagnosis and memory functions. If the self-diagnosis finds a malfunction, the ECU will activate the indicator lamp, the warning lamp or the multi-information display to alert the driver of the system status.

Automatic operation

When you depress the accelerator pedal with all of the conditions below satisfied, the electric parking brake ECU will determine that the driver is starting the vehicle, and release the parking brake automatically.
Vehicle condition

The vehicle stationary
The engine is running.
Selector lever: D or R position
Seat belt (driver’s side): Fastened
Electric parking brake: apply

note

The automatic operation works only when the driver’s seat belt is fastened. If you start the vehicle without fastening the seat belt, the multi-information display should show "RELEASE PARKING BRAKE".

Overheat protection mode for electric motor

When the electric parking brake switch is operated repeatedly within a short time, the system will take the measures below for 60 seconds to protect the electric parking brake actuator (electric motor) from overheating. In 60 seconds, the system will reset the switch operation counter, and then resume to the normal operation.
Measures

The system does not accept any operations of the electric parking brake switch for 60 seconds. However, the system enables the driver to operate the switch once to release the parking brake when the electric motor is locked with the overheat protection mode triggered (the system does not enable the driver to operate the switch to apply the parking brake).
When the ASC-ECU requests the system to apply the parking brake, the system accepts the request.
The system perform the followings while the electric motor is disabled to run:

Electric parking brake switch indicator lamp: Flashes for 60 seconds
Parking brake warning lamp: Flashes for 60 seconds
Multi-information display: "PARKING BRAKE TEMPORARILY NOT AVAILABLE" is displayed

Maintenance mode

The electric parking brake ECU will enter the maintenance mode when the switch is operated in certain ways. When the system enters the maintenance mode, the electric parking brake will be released to facilitate replacement of the rear brake pad or the rear disc brake rotor. For details of the maintenance mode, refer to GROUP 35A - On-vehicles service