Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Horn Circuit

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:

• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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• Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Press the horn switch and check if the horns sound.

B

GO TO HORN SYSTEM

A

(a) Remove the main body ECU (multiplex network body ECU).

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(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:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY