Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001XOG9
Model Year Start: 2022 Model: Avalon Prod Date Range: [08/2021 -           ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): Electric Parking Brake does not Operate; 2022 MY Avalon [08/2021 -        ]

Electric Parking Brake does not Operate

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Even if the electric parking brake is operating normally, the parking brake indicator light 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) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.

Click here 2022 MY Avalon Avalon HV [08/2021 -        ]; PARKING BRAKE: ELECTRIC PARKING BRAKE ACTUATOR: ON-VEHICLE INSPECTION

Result

Proceed to

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

A

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

B

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

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

Park Warning

(b) Check the combination meter assembly.

OK:

Parking brake indicator light 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 A28 skid control ECU (brake actuator assembly) connector.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A28-30 (+BS) - Body ground

Engine switch off

11 to 14 V
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 A28 skid control ECU (brake actuator assembly) connector.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A28-36 (IG1) - Body ground

Engine switch ON

11 to 14 V
OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR