Toyota Avalon Service & Repair Manual: 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.
  • 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.
  • 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 > Electric Parking Brake > 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 5

A

3.

PERFORM ACTIVE TEST USING TECHSTREAM (PARKING BRAKE LIGHT)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

PKB Light

Parking brake indicator light (red)

ON or OFF

  • Vehicle stopped
  • Engine switch on (IG)
  • Parking brake released
Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

PKB Light

(g) Select the Data List on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Parking Brake Light

Parking brake indicator light (red) output signal

OFF, Light or Blink

OFF: Parking brake indicator light (red) turns off

Light: Parking brake indicator light (red) illuminates

Blink: Parking brake indicator light (red) flashes

-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Parking Brake Light

(h) Check the operating condition of the parking brake indicator light (red) when operating it using the Techstream.

Result

Proceed to

Parking brake indicator light (red) in the Data List does not change using the Active Test

A

Parking brake indicator light (red) in the Data List turns ON/OFF using the Active Test

B

A

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

B

4.

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

5.

CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

(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 (IG)

11 to 14 V

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Dtc Check / Clear

    Electric Parking Brake System AUTO Function Circuit

    See More:

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