Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) receives shift position information from the ECM via CAN communication.

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Engine 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 engine switch is on (IG) and the brake pedal is depressed.

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.
• 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

(a) Check for DTCs.

A

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

B

GO TO SFI SYSTEM