Theft Deterrent System Horn Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HORN ASSEMBLY

CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU - NO. 1 INTEGRATION RELAY [HORN RELAY])

THEFT DETERRENT SYSTEM - Horn Circuit


DESCRIPTION

When the theft deterrent system is changed from the armed state to the alarm sounding state, the ECU turns on the HORN relay, causing the vehicle horn to sound at 0.4 second intervals.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Theft Deterrent.Theft Deterrent System.Theft Deterrent System Horn Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the theft warning ECU assembly, refer to the registration procedures (Toyota Fortuner RM000000Z4Z008X.html).
1.CHECK HORN ASSEMBLY

  1. Press the horn switch and check if the horn sounds.

    Result
    Result
    		Proceed to
    Horn sounds
    		A
    Horn does not sound
    		B


B
Go to HORN SYSTEM (Toyota Fortuner RM0000013O7008X.html)
A


2.CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU - NO. 1 INTEGRATION RELAY [HORN RELAY])

  1. Disconnect the T36 theft warning ECU assembly connector.

  1. Disconnect the 1I No. 1 integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T36-24 (HORN) - 1I-7
    		Always
    		Below 1 Ω
    T36-24 (HORN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY