Lexus ES manuals

Lexus ES: Electric Parking Brake System AUTO Function Circuit

Lexus ES (XZ10) Service Manual / Brake / Parking Brake / Electric Parking Brake System (for Hv Model) / Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The parking brake ECU (brake actuator assembly) receives shift position information from the hybrid vehicle control ECU via CAN communication, and wheel speed signal and stop light switch signals from the skid control ECU (brake booster with master cylinder assembly).

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Power switch is on (IG), 2) brake pedal is depressed, and 3) shift lever is moved out of P. When the shift lever is moved to P with these conditions met, the function automatically locks the parking brake.

The electric parking brake system AUTO (shift-linked function) automatically engages the parking brake when the shift lever is moved to P and disengages the parking brake when the shift lever is moved out of P when the power switch is on (IG) and the brake pedal is depressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch assembly to turn off the parking brake indicator light (red).

PROCEDURE

1.

CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B

B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

2.

CHECK DTC (HYBRID CONTROL SYSTEM)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B

A

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

B

GO TO HYBRID CONTROL SYSTEM

READ NEXT:

 Fail-safe Chart

FAIL-SAFE CHART DTC Trouble Area Brake System Warning Light (Yellow) Parking Brake Indicator Light (Red) Fail-safe Deactivation Condition C1245 Deceleration sensor data malfunction

 Freeze Frame Data

FREEZE FRAME DATA FREEZE FRAME DATA HINT: When a DTC is stored, the freeze frame data stores the current vehicle (sensor) state as. The freeze frame data cannot be cleared or updated until the re

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer and confir

SEE MORE:

 Removal

REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during shift paddle switch (transmission shift switch assembly) removal/installation are shown below. Necessar

 Generator Control Module Circuit Intermittent (P0A1B1F)

DESCRIPTION If the motor generator control ECU, which is built into in the inverter with converter assembly, is reset due to a problem with the power source in the inverter, the motor generator control ECU will store this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area MI

© 2016-2024 Copyright www.lexguide.net