Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

In case of using the LEXUS hand-held tester, start the inspection from step 1 and in case of not using the LEXUS hand-held tester, start from step 2.

Check theft deterrent horn using LEXUS hand-held tester.
PREPARATION:

Connect the LEXUS hand-held tester to the DLC3.

CHECK:

Check that the theft deterrent horn sounds in ACTIVE TEST.
1. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to next step.
Check theft deterrent horn.
CHECK:

Connect positive (+) lead to terminal 1 and negative (-) lead to body ground of theft deterrent horn connector, and that the theft deterrent horn blows.

OK:

Horn sound

Fig 1: Checking Theft Deterrent Horn
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace theft deterrent horn.
2. OK : Go to next step.
Check wire harness and connector between theft deterrent ECU and theft deterrent horn (See HOW TO PROCEED WITH TROUBLESHOOTING ).
1. NG : Check and repair wire harness or connector.
2. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).