Theft Deterrent System (W/ Intrusion Sensor) Security Horn Circuit

Securities. Lexus Is250, Is220D. Gse20 Ale20
Theft Deterrent. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SECURITY HORN ASSEMBLY

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - SECURITY HORN ASSEMBLY)

THEFT DETERRENT SYSTEM (w/ Intrusion Sensor) - Security Horn Circuit


DESCRIPTION

When the theft deterrent system is operating, the relay in the main body ECU RH turns on and off, causing the security horn to sound.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Theft Deterrent.Theft Deterrent System (W/ Intrusion Sensor).Theft Deterrent System (W/ Intrusion Sensor) Security Horn Circuit


INSPECTION PROCEDURE

1.INSPECT SECURITY HORN ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20

  1. Remove the security horn assembly.

  1. Check operation of the horn.

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


NG
REPAIR OR REPLACE SECURITY HORN ASSEMBLY
OK


2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - SECURITY HORN ASSEMBLY)


    Lexus Is250, Is220D. Gse20 Ale20.Theft Deterrent.Theft Deterrent System (W/ Intrusion Sensor).Theft Deterrent System (W/ Intrusion Sensor) Security Horn Circuit

  1. Disconnect the A36 ECU connector and the A37 horn connector.

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

    Standard resistance:
    Symbol (Terminal Connection)
    		Specified Condition
    SH (A36-1) - (A37-1)
    		Below 1 Ω
    SH (A36-1) or (A37-1) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE