Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Diagram

SYSTEM DIAGRAM

FRONT SEAT BELT WARNING

Communication Table

Sender	Receiver	Signal	Communication Method
Airbag ECU assembly	Main body ECU (multiplex network body ECU)	Front seat inner belt assembly LH buckle switch	CAN
Airbag ECU assembly	Combination meter assembly	Front seat inner belt assembly RH buckle switch Occupant detection
Skid control ECU (brake actuator assembly)	Combination meter assembly	Vehicle speed
ECM	Combination meter assembly	Shift position
Occupant detection ECU	Airbag ECU assembly	Front seat inner belt assembly RH buckle switch Occupant detection
Main body ECU (multiplex network body ECU)	Combination meter assembly	Front seat inner belt assembly LH buckle switch Parking brake switch

REAR SEAT BELT WARNING

Communication Table

Sender	Receiver	Signal	Communication Method
Main body ECU (multiplex network body ECU)	Combination meter assembly	Rear door courtesy light switch (LH/RH) Parking brake switch	CAN

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS NEXT 3. CONNECT TECHSTREAM TO DLC3* HINT: If the display indicates a communication malfunction, inspect the DLC3. When any CAN communication system DTCs are output, perform ...

Toyota Avalon (XX50) 2019-2022 Owners Manual