Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Passenger Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the engine switch is turned on (IG), the occupant detection ECU sends signals to the airbag ECU assembly to indicate the state of the front seat inner belt assembly RH and also whether the front passenger seat is occupied. The airbag ECU assembly sends those signals to the combination meter assembly via CAN communication. The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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HINT:

The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat. Check that the operation of the seat belt warning light is normal first.

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If the seat belt warning light does not operate for both the driver seat and front passenger seat, replace the combination meter.

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PROCEDURE

(a) Clear the DTCs.

(b) Check for DTCs.

B

GO TO OCCUPANT CLASSIFICATION SYSTEM

A

(a) Clear the DTCs.

(b) Check for DTCs.

B

GO TO AIRBAG SYSTEM

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Occupant Detection / Data List.

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

B

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

C

REPLACE OCCUPANT DETECTION ECU

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.

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

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIR BAG ECU ASSEMBLY