Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001BQW6
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): Parking Brake Switch Circuit; 2019 - 2022 MY Avalon HV [04/2018 -        ]

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.

NG

GO TO ELECTRIC PARKING BRAKE SYSTEM 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING 2022 MY Avalon HV [08/2021 -        ]; PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

OK

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.

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

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
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 2019 MY Avalon HV [04/2018 - 08/2019]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2020 MY Avalon HV [08/2019 - 08/2020]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2021 - 2022 MY Avalon HV [08/2020 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR