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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).

  1. 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.

  2. 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.

  3. Check Circuits

    Check circuits for faults between headlight control switch and body control ECU. See WIRING DIAGRAMS. Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.
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