Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Parking Brake Switch Circuit

DESCRIPTION

This circuit is from the parking brake ECU (brake actuator assembly) to the radio and display receiver assembly.

WIRING DIAGRAM

PROCEDURE

1.	CHECK BRAKE WARNING LIGHT

(a) Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.

OK:

The brake warning light operates as specified above.

GO TO ELECTRIC PARKING BRAKE SYSTEM

2.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-20 (PKB) - A39-19 (PKB)	Always	Below 1 Ω
G2-20 (PKB) or A39-19 (PKB) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Airbag System(for Gasoline Model): Short in Rear Side Squib RH Circuit (B1850-B1853)
DESCRIPTION The rear side squib RH circuit consists of the airbag ECU assembly and rear seat airbag assembly RH. The airbag ECU assembly uses this circuit to deploy the airbag when deployment conditions are met. These DTCs are stored when a malfunction is detected in the rear side squib RH circuit. ...

Toyota Avalon (XX50) 2019-2022 Owners Manual