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Wiper/Washer 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, check wiper/washer switch using DATA LIST. If wiper/washer switch is not okay, go to next step. If wiper/washer switch is okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.

  2. Check Wiper/Washer Switch

    Check wiper/washer switch. See WIPER/WASHER SWITCH in appropriate WIPER/WASHER SYSTEMS article. If wiper/washer switch is okay, go to next step. Replace wiper/washer switch as necessary. Retest system operation.

  3. Check Circuits

    Check circuits for faults between wiper/washer 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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