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System Description
 
 
SYSTEM DIAGRAM
ComponentSignal description
ECMMainly transmits the following signals to chassis control module via CAN communication.
  • Accelerator pedal position signal
  • Engine torque signal
TCMMainly transmits the following signals to chassis control module via CAN communication.
  • Current gear position signal
ABS actuator and electric unit (control unit)Mainly transmits the following signals to chassis control module via CAN communication.
  • Brake hold status signal
  • Brake fluid pressure signal
  • Electric parking brake operation signal (switch)
  • Electric parking brake status signal
  • Front LH wheel speed signal
  • Front RH wheel speed signal
  • Rear LH wheel speed signal
  • Rear RH wheel speed signal
  • ASC malfunction signal
  • Decel G signal
  • Electric parking brake malfunction signal
Combination meterMainly receives the following signals from chassis control module via CAN communication.
  • Automatic brake hold indicator light signal
  • Meter display signal
BCMMainly transmits the following signals to chassis control module via CAN communication.
  • Brake pedal status signal
  • Seat belt buckle switch (driver side) signal
Chassis control moduleChassis Control Module
Parking brake switch
(automatic brake hold switch)
Parking Brake Switch (Automatic Brake Hold Switch)
 
 
OPERATION
 
 
Automatic Brake Hold Function ON (Operation Permitted)
If automatic brake hold switch is pressed when ignition switch is ON, automatic brake hold function turns ON. In addition, automatic brake hold switch indicator illuminates.
noteThe automatic brake hold function resets to OFF every time the ignition switch is switched from ON to OFF.
 
 
Automatic Brake Hold Function OFF (Operation Not Permitted)
If automatic brake hold switch is pressed when automatic brake hold function is ON, automatic brake hold function turns OFF. In addition, automatic brake hold switch indicator turns OFF. [If automatic brake hold indicator light (white or green) is ON, it turns OFF.]
noteTo turn OFF automatic brake hold function while the brakes are held by automatic brake hold, press automatic brake hold switch while depressing brake pedal.
 
 
Standby
When all of the following conditions are satisfied, automatic brake hold enters in the standby state, and automatic brake hold indicator light (white) illuminates.
  • Seat belt (driver side) is fastened
  • Parking brake release
  • Electric shift selector is other than P range.
 
 
Operation
If all of the following conditions are satisfied in the standby state, automatic brake hold operates, and the color of automatic brake hold indicator light changes from white to green. In addition, automatic brake display appears on information display of combination meter.
noteAlthough the conditions are satisfied in the standby state, automatic brake hold may not operate depending on how far brake pedal is depressed. When automatic brake hold does not operate, depress brake pedal far enough until automatic brake hold indicator light (green) turns on.
  • Vehicle speed: 0 km/h (0 MPH)
  • Brake pedal is depressed
  • Automatic brake hold is in the standby state [automatic brake hold switch indicator and automatic brake hold indicator light (white) are illuminated]
  • Not on a steep slope
  • Seat belt (driver side) is fastened
  • Parking brake release
  • Electric shift selector is other than P range.
 
 
Release (Starting Vehicle)
If the following condition is satisfied while automatic brake hold is being applied, automatic brake hold is released. (The color of automatic brake hold indicator light changes from green to white.)
noteWhen depressing accelerator pedal at except P range and N range just before moving the vehicle.
 
 
Release (Changing to Parking Brake)
If any of the following conditions are met while automatic brake hold is being applied, parking brake is operated automatically, and automatic brake hold is released. (Automatic brake hold indicator light turns OFF.)
  • Operation of automatic brake hold is continued for approximately 3 minutes
  • Seat belt (driver side) is unfastened
  • Ignition switch OFF
  • A malfunction is detected in automatic brake hold
  • Electric shift selector is P range
 
 
Parking
If shifting the electric shift selector to P range while automatic brake hold is being applied, automatic brake hold is released. (Automatic brake hold indicator light turns OFF.)
 
 
Timing Chart
  • The vehicle is started while automatic brake hold is being applied
    When the vehicle is stopped by a brake operation by the driver, maintaining of brake fluid pressure is started.
    Automatic brake hold is applied (this function holds brake fluid pressure even after the driver has released brake pedal).
    When the driver performs starting operation, automatic brake hold is released (brake fluid pressure is decreased).
  • Changing the vehicle holding method to parking brake while automatic brake hold is being applied
    When the vehicle is stopped by a brake operation by the driver, maintaining of the brake fluid pressure is started.
    Automatic brake hold is applied (this function holds brake fluid pressure even after the driver has released brake pedal).
    If the conditions for changing to parking brake are satisfied while automatic brake hold is being applied, the method of holding the vehicle stopped is automatically changed to parking brake.