Theft Deterrent System Horn Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HORN OPERATION

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VEHICLE HORN)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU)

THEFT DETERRENT SYSTEM - Horn Circuit


DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the horns to sound.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).Theft Deterrent System Horn Circuit


INSPECTION PROCEDURE

1.CHECK HORN OPERATION

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

    OK:
    Horns operate normally.


NG
GO TO HORN SYSTEM (LandCruiser RM000002W3D01PX.html)
OK


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VEHICLE HORN)

  1. Operate the intelligent tester according to the steps on the display and select Active Test (LandCruiser RM000000W0S036X.html).

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Vehicle Horn
    		Vehicle horns
    		ON/OFF
    		-
    OK:
    Horns operate normally.


NG
Go to step 3
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000002TGC02DX.html)

3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU)

  1. Disconnect the 1A relay connector.

  1. Remove the main body ECU (LandCruiser RM000003WBO05FX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1A-7 - A-28 (HORN)
    		Always
    		Below 1 Ω
    1A-7 or A-28 (HORN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)