Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Electric Parking Brake does not Operate

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Parking Brake / Electric Parking Brake System / Electric Parking Brake does not Operate

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The electric parking brake may still operate up to 20 seconds after the engine switch is turned off. Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

  • When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).

HINT:

Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

VEHICLE OPERATION CHECK

(a) When the vehicle's tires are lifted off the ground and the Techstream is used to operate the electric parking brake, check the condition of the rear tires.

Click here

Result

Proceed to

Lock and release operation is normal and parking brake indicator light turns off or blinks (red)

A

Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation

B

Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red)

C
B

INSPECT REAR BRAKE
C

GO TO STEP 4

A

3.

INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly using the Techstream.

Body Electrical > Combination Meter > Active Test

Tester Display

Indicat. Park

(b) Check the combination meter assembly.

OK:

Parking brake indicator light (red) turns on or off in accordance with Techstream operation.

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

GO TO METER / GAUGE SYSTEM

4.

CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE)

(a) Turn the engine switch off.

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A41-14 (+BS) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL VOLTAGE)

(a) Turn the engine switch off.

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A41-45 (IG1) - Body ground

Engine switch on (IG)

11 to 14 V

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))
OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Electric Parking Brake Actuator (C13B800)
    DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note C13B800 Electric Parking Brake Actuator Diagnosis Condition: Electric parking brake operatin ...

    Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF
    DESCRIPTION When the AUTO function is set to ON/OFF, a message is displayed on the multi-information display in the combination meter assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: The e ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Dynamic Torque Control Awd System: Linear Solenoid Power Supply System Malfunction (C120C)
    DESCRIPTION This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system. DTC No. Detection Item DTC Detection Condition Trouble Area C120C Linear Solenoid Power Supply System Malfunction When the 4WD relay is operating, the 4WD re ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Wiper Rubber: Replacement
    REPLACEMENT PROCEDURE 1. REMOVE REAR WIPER BLADE (w/o Rear No. 2 Seat) (a) Turn the engine switch on (IG). (b) Operate the rear wiper and when the rear wiper arm and blade assembly reach the point at which they reverse, turn the engine switch off. (c) Apply protective tape to the rear ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0119