Theft Deterrent System Security Horn Circuit

Vehicle Interior. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Theft Deterrent Keyless Entry. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 seconds intervals, causing the security horn assembly to sound.

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Theft Deterrent Keyless Entry.Engine Immobiliser System.Theft Deterrent System Security Horn Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the theft warning ECU assembly, refer to the registration procedures (HILUX_TGN26 RM000000Z4Z01KX.html).
1.INSPECT SECURITY HORN ASSEMBLY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

  1. Remove the the security horn assembly (HILUX_TGN26 RM000002PLR01MX.html).

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

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


NG
REPLACE SECURITY HORN ASSEMBLY (HILUX_TGN26 RM000002PLR01MX.html)
OK


2.CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU - SECURITY HORN)

  1. Disconnect the G29 theft warning ECU assembly connector.

  1. Disconnect the A25 security horn assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G29-13 (SH-) - A25-1
    		Always
    		Below 1 Ω
    G29-13 (SH-) or A25-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY (HILUX_TGN26 RM000004QXI00GX.html)