Theft Deterrent System Security Horn Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SECURITY HORN ASSEMBLY

CHECK WIRE HARNESS (THEFT WARNING ECU - SECURITY HORN)

THEFT DETERRENT SYSTEM - Security Horn Circuit


DESCRIPTION

When the theft deterrent system is operating, a relay in the theft warning ECU turns ON and OFF continuously at 0.4 second intervals, causing the security horn to sound.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

1.INSPECT SECURITY HORN ASSEMBLY
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50

  1. Apply battery voltage to the horn and check the operation of the horn.

    OK:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 1
    Battery negative (-) → Horn bracket
    		Horn sounds


NG
REPLACE SECURITY HORN ASSEMBLY
OK


2.CHECK WIRE HARNESS (THEFT WARNING ECU - SECURITY HORN)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Theft Deterrent.Theft Deterrent System.Theft Deterrent System Security Horn Circuit

  1. Disconnect the T16 ECU connector.

  1. Disconnect the S1 horn connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T16-26 (SH-) - S1-1
    		Below 1 Ω
    T16-26 (SH-) or S1-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE THEFT WARNING ECU