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.
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HOMESERVICE MANUALSLEXUS1998GS 300REPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY CONTROL SYSTEMCIRCUIT TESTSHEADLIGHT CONTROL SWITCH CIRCUIT
1998 Lexus GS 300
Headlight Control Switch Circuit
1998 Lexus GS 300SECTION Headlight Control Switch Circuit
NOTE:
If LEXUS scan tool is available, start test from step 1). If this scan tool is not available, start test from step 2).
- Check Headlight Control Switch Using Scan Tool
Using scan tool, check headlight control switch using DATA LIST. If headlight switch is not okay, go to next step. If headlight switch is okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table. - Check Headlight Control Switch
Check headlight control switch. See STEERING COLUMN SWITCHES article. If headlight control switch is okay, go to next step. Replace headlight control switch as necessary. Retest system operation. - Check Circuits
Check circuits for faults between headlight control switch and body control ECU No. 2. See WIRING DIAGRAMS. Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.
RENDER: 1.0x
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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.