Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Horn Switch Test
- Disconnect negative battery cable. At sides of steering wheel, remove covers, then loosen Torx screws that secure air bag module to steering wheel. Lift out air bag module and place it on top of steering column (leave connector attached). Disconnect 6-pin connector from combination switch. See Fig 1.
- Connect ohmmeter between chassis ground and terminal No. 6 of the 6-pin connector (backprobe the terminal). There should be no continuity. Press horn contact plate against steering wheel spoke. There should be continuity. If continuity is not as specified, replace steering wheel or harness as necessary.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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