DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horns to sound at intervals of 0.4 seconds. WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Press the horn switch and check if the horns sound.
(a) Remove the main body ECU (multiplex network body ECU). Click here
(b) Disconnect the 4F instrument panel junction block assembly connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Seat Belt Warning System(for Hv Model): Rear Seat Belt Warning Light Malfunction
DESCRIPTION The main body ECU (multiplex network body ECU) detects whether either the rear doors are open or closed based on the courtesy light switch condition and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects rear seat belt state. ...
