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Hazard 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 Hazard Switch Using Scan Tool

    Using scan tool, operate hazard switch in ACTIVE TEST. If hazard switch does not operate (hazard lights do not operate), go to next step. If taillight relay operates (taillights operate), go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.

  2. Check Hazard Switch

    Check hazard switch. See HAZARD SWITCH under COMPONENT TESTS. If hazard switch is okay, go to next step. Replace hazard switch as necessary. Retest system operation.

  3. Check Circuits

    Check circuits for faults between hazard switch and body control ECU No. 1. 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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