Toyota Avalon (XX50): Panel Switches do not Function. Parking Brake Switch Circuit. Parts Location

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Hv Model) / Panel Switches do not Function. Parking Brake Switch Circuit. Parts Location

Panel Switches do not Function

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
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When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.

PROCEDURE

1.	CHECK PANEL SWITCH

(a) Check for foreign matter around the switches that might prevent operation.

OK:

No foreign matter is found.

REMOVE ANY FOREIGN MATTER FOUND

2.	CHECK PANEL & STEERING SWITCH (OPERATION CHECK)

(a) Enter the "Panel & Steering Switch Check Mode" screen. Refer to Check Panel & Steering Switch in Operation Check.

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(b) Operate the abnormal switch and check if the switch status is correctly displayed.

OK:

The switch status is correctly displayed as operated.

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

Parts Location

PARTS LOCATION

ILLUSTRATION

ROOF CONSOLE BOX SUB-ASSEMBLY

TELEPHONE MICROPHONE ASSEMBLY

PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

- ECU-ACC FUSE

- ECU-DCC NO. 2 FUSE

- ECU-IG1 NO. 4 FUSE

- ECU-IG2 NO. 3 FUSE

- DCM FUSE

- PANEL FUSE

- METER-IG2 FUSE

- RADIO FUSE

NO. 2 ENGINE ROOM RELAY BLOCK AND NO. 2 JUNCTION BLOCK ASSEMBLY

- AMP NO. 1 FUSE (for 14 Speakers)

- AMP NO. 2 FUSE (for 14 Speakers)

ILLUSTRATION

*1	NAVIGATION ANTENNA ASSEMBLY	*2	SPIRAL CABLE SUB-ASSEMBLY
*3	STEERING PAD SWITCH ASSEMBLY	*4	RADIO AND DISPLAY RECEIVER ASSEMBLY
*5	NO. 5 ANTENNA CORD SUB-ASSEMBLY	*6	COMBINATION METER ASSEMBLY
*7	DLC3	*8	NO. 4 ANTENNA CORD SUB-ASSEMBLY
*9	DCM (TELEMATICS TRANSCEIVER)	*10	STEREO JACK ADAPTER ASSEMBLY
*11	- GPS	-	-

ILLUSTRATION

for 8 Speakers

*1	FRONT NO. 1 SPEAKER ASSEMBLY LH	*2	FRONT NO. 1 SPEAKER ASSEMBLY RH
*3	FRONT NO. 2 SPEAKER ASSEMBLY LH	*4	FRONT NO. 2 SPEAKER ASSEMBLY RH
*5	REAR SPEAKER ASSEMBLY LH	*6	REAR SPEAKER ASSEMBLY RH
*7	REAR NO. 2 SPEAKER ASSEMBLY LH	*8	REAR NO. 2 SPEAKER ASSEMBLY RH

ILLUSTRATION

for 14 Speakers

*1	FRONT NO. 1 SPEAKER ASSEMBLY LH	*2	FRONT NO. 1 SPEAKER ASSEMBLY RH
*3	FRONT NO. 2 SPEAKER ASSEMBLY LH	*4	FRONT NO. 2 SPEAKER ASSEMBLY RH
*5	FRONT NO. 4 SPEAKER ASSEMBLY	*6	FRONT NO. 3 SPEAKER ASSEMBLY LH
*7	FRONT NO. 3 SPEAKER ASSEMBLY RH	*8	REAR SPEAKER ASSEMBLY LH
*9	REAR SPEAKER ASSEMBLY RH	*10	REAR NO. 2 SPEAKER ASSEMBLY LH
*11	REAR NO. 2 SPEAKER ASSEMBLY RH	*12	SPEAKER ASSEMBLY WITH BRACKET LH
*13	SPEAKER ASSEMBLY WITH BRACKET RH	*14	REAR NO. 3 SPEAKER ASSEMBLY
*15	STEREO COMPONENT AMPLIFIER ASSEMBLY	-	-

ILLUSTRATION

*1	RADIO SETTING CONDENSOR	*2	WINDOW GLASS ANTENNA WIRE
*3	NO. 2 AMPLIFIER ANTENNA ASSEMBLY	*4	NO. 3 ANTENNA CORD SUB-ASSEMBLY
*5	TELEPHONE ANTENNA ASSEMBLY (w/ SXM Function) - SiriusXM	*6	NO. 2 ANTENNA CORD SUB-ASSEMBLY (w/ SXM Function)
*7	ANTENNA CORD SUB-ASSEMBLY	*8	NO. 1 AMPLIFIER ANTENNA ASSEMBLY
*9	- FM Main - AM	*10	- FM Sub

Operation Check

Poor Sound Quality in All Modes (Low Volume). Portable Player cannot be Connected Manually/Automatically. Portable Player cannot be Registered

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