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 transmits a signal to cause the horn to sound at 0.4-second intervals.

WIRING DIAGRAM


B213790E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following 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 ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body Electrical / Main Body / Active Test.

  1. According to the display on the tester, perform the Active Test.

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

    OK:
    The vehicle horns sound and stop correctly when operating them through the intelligent tester.



NG
Go to step 3
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

3.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - INTEGRATION RELAY)


    B213791E01

  1. Disconnect the 3B instrument panel junction block connector and 1D integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1D-11 - 3B-22*1
    		Always
    		Below 1 Ω
    1D-9 - 3B-22*2
    		Always
    		Below 1 Ω
    3B-22 - Body ground
    		Always
    		10 kΩ or higher

    1. *1: for 1ND-TV
    2. *2: for 1KR-FE and 1NR-FE

Text in Illustration 
*1
Front view of wire harness connector
(to Integration Relay)
*2
Front view of wire harness connector
(to Instrument Panel Junction Block)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE MAIN BODY ECU

  1. Temporarily replace the main body ECU with a new or normally functioning one (Click here).


NEXT


5.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body Electrical / Main Body / Active Test.

  1. According to the display on the tester, perform the Active Test.

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

    OK:
    The vehicle horns sound and stop correctly when operating them through the intelligent tester.



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK
OK

END (MAIN BODY ECU IS DEFECTIVE)