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. Click here
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. Click here
If the seat belt warning light does not operate for both the driver seat and front passenger seat, replace the combination meter. Click here
PROCEDURE
(a) Clear the DTCs. Body Electrical > Occupant Detection > Clear DTCs(b) Check for DTCs. Body Electrical > Occupant Detection > Trouble Codes
(a) Clear the DTCs. Body Electrical > SRS Airbag > Clear DTCs(b) Check for DTCs. Body Electrical > SRS Airbag > Trouble Codes
(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. Body Electrical > Occupant Detection > Data List
(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. Body Electrical > SRS Airbag > Data List
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Audio And Visual System(for Gasoline Model): 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. Click here When replacing the radio and display receiver assembly, ...
