Horn Switch

WARNING: This page is about a different car, the 2003 Lexus IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Remove horn pad. See the following:
- For 2002 models, see DRIVER-SIDE AIR BAG MODULE under REMOVAL & INSTALLATION in AIR BAG RESTRAINT SYSTEMS article.
- For 2003 models, see DRIVER-SIDE AIR BAG MODULE under REMOVAL & INSTALLATION in AIR BAG RESTRAINT SYSTEMS article.
Remove left and right covers from steering wheel.
Check that no continuity exists between terminal No. 6 of connector and body ground when horn contact plate is pressed against steering spoke assembly. See Fig 1. If continuity is not as specified, repair or replace steering wheel or wiring harness as necessary. See WIRING DIAGRAMS . Install horn pad. Reverse removal procedure.

Fig 1: Inspecting Horn Switch Continuity