THEFT DETERRENT SYSTEM > Horn Circuit


DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the multiplex network body ECU turns on the HORN relay, causing the horns to sound.

WIRING DIAGRAM


B110518E02


INSPECTION PROCEDURE

1.INSPECT HORN OPERATION

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

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



B
GO TO HORN SYSTEM
A


2.READ DATA LIST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the intelligent tester main switch on.

  1. Select the item below in the DATA LIST and read the display on the tester.

    BODY (Multiplex network body ECU): 
    Item
    		Test Details
    		Diagnostic Note
    Warning by Horn
    		Warning by horn ON/OFF
    		-

    Result: 
    Result
    		Go to
    OFF
    		Buzzer operation is set to off by customization.
    ON
    		A


A


3.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the intelligent tester main switch on.

  1. Select the item below in the ACTIVE TEST and then check that the horns operate.

    BODY (Multiplex network body ECU): 
    Item
    		Test Details
    		Diagnostic Note
    Vehicle Horn
    		Vehicle horn ON/OFF
    		-

    OK:
    The vehicle horns sound or stop correctly when operating it through the intelligent tester.



NG
Go to step 4
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

4.CHECK HARNESS AND CONNECTOR (J/B NO.2 - INSTRUMENT PANEL J/B ASSEMBLY)


  1. Disconnect the 2H J/B No.2 connector and 1D instrument panel J/B connector.


    B110544E01

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

    Resistance:
    Tester Connection
    		Specified Condition
    2H-9 - 1D-11
    		Below 1 Ω
    2H-9 or 1D-11 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE INSTRUMENT PANEL J/B ASSEMBLY