Home

Toyota Workshop

GSIC - Global Service Information Center

THEFT DETERRENT SYSTEM > Horn Circuit

for Preparation Click here


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 horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM


B229046E01


INSPECTION PROCEDURE

1.INSPECT HORNS

  1. Press the horn switch and check if the horns sound.

    Result:
    Result
    		Proceed to
    Horns sound
    		A
    Horns do not sound
    		B



B
GO TO HORN SYSTEM (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Select the item below in the Active Test and then check that the horns operate.

    Main Body 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Vehicle Horn
    		Vehicle horns
    		ON / OFF
    		-

    Result:
    Result
    		Proceed to
    The vehicle horns do not sound and stop correctly when operated through the intelligent tester
    		A
    The vehicle horns sound and stop correctly when operated through the intelligent tester
    		B



B
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)
A


3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


  1. Disconnect the 2C instrument panel junction block assembly and A main body ECU (multiplex network body ECU) connectors.


    B220581E02

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2C-24 - A-28 (HORN)
    		Always
    		Below 1 Ω


    Text in Illustration 
    *1
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		*2
    		Front view of wire harness connector
    (to Main Body ECU (Multiplex Network Body ECU))



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)