Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit wiring diagram, see Fig 1.
- Check the horn. See HORN under COMPONENT TESTS. If the results are OK, go to the next step. If the results are not OK, replace the horn.
- Check for short to power, short to ground and continuity in the wiring harness and connector between the horn relay and body ECU No. 1. If the results are OK, perform the next test procedure of the problem symptom. See BODY ECU NO. 1 PROBLEM SYMPTOM INDEX table. If the results are OK, repair or replace the wiring harness or connector.