Theft Deterrent System Security Horn Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SECURITY HORN ASSEMBLY

CHECK HARNESS AND CONNECTOR (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 assembly 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

NOTICE:
When replacing the theft warning ECU assembly, refer to the registration procedures (Toyota Fortuner RM000000Z4Z008X.html).
1.INSPECT SECURITY HORN ASSEMBLY
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50

  1. Remove the security horn assembly.

  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 HARNESS AND CONNECTOR (THEFT WARNING ECU - SECURITY HORN)

  1. Disconnect the T36 theft warning ECU assembly connector.

  1. Disconnect the S1 security horn assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T36-26 (SH-) - S1-1
    		Always
    		Below 1 Ω
    T36-26 (SH-) or S1-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY