Lexus ES: 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 | .gif) | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
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|
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| 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:
Brake Switch "A" Signal Compare Failure (P057162)
DESCRIPTION When the brake pedal is depressed, the stop light switch assembly outputs a signal to the hybrid vehicle control ECU. The hybrid vehicle control ECU uses this signal to control cancellation of vehicle speed by the dynamic radar cruise control. When the hybrid vehicle control ECU determin
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