Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Left Electric Parking Brake Actuator Control Circuit Short to Battery (C060B12)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Parking Brake / Electric Parking Brake System / Left Electric Parking Brake Actuator Control Circuit Short to Battery (C060B12)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C060B12

Left Electric Parking Brake Actuator Control Circuit Short to Battery
  • Diagnosis Condition:

    Electric parking brake not operating

  • Malfunction Status:

    The ECU power supply is normal but there is a malfunction in the electric parking brake actuator LH internal circuit (short to +B).

  • Detection Time:

    Approximately 1 second
  • Parking brake actuator assembly LH
  • No. 2 parking brake wire assembly
  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

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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.
  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

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

PROCEDURE

1.

CHECK FOR SHORT TO +B

(a) Turn the engine switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

(c) Disconnect the o2 parking brake actuator assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

o2-2 (MRL+) - o2-1 (MRL-)

Electric parking brake not operating

Below 1 V

*a

Front view of No. 2 Parking Brake Wire Assembly

(to Parking Brake Actuator Assembly LH)
OK

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

NG

2.

CHECK FOR SHORT TO +B

(a) Disconnect the oS1 No. 2 parking brake wire assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

oS1-1 - oS1-2

Electric parking brake not operating

Below 1 V

*a

Front view of wire harness connector

(to No. 2 Parking Brake Wire Assembly)
OK

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY
NG

3.

CHECK FOR SHORT TO +B

(a) Disconnect the oS1 No. 2 parking brake wire assembly connector.

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

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

*a

Front view of wire harness connector

*b

(to Skid Control ECU (Brake Actuator Assembly))

*c

(to No. 2 Parking Brake Wire Assembly)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

oS1-1 or A41-3 (MRL+) - Body ground

Always

Below 1 V

oS1-2 or A41-2 (MRL-) - Body ground

Always

Below 1 V
OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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