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Stoplight 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 Stoplight Switch Using Scan Tool

    Using scan tool, check stoplight switch using DATA LIST. If stoplight switch is not okay, go to next step. If stoplight switch is okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.

  2. Check Stoplight Switch

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

  3. Check Circuits

    Check circuits for faults between stoplight switch, body control ECU No. 2 and battery. 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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