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Test No. 12: 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. Using scan tool, operate hazard switch in ACTIVE TEST. If hazard switch does not operate, go to next step. If hazard switch operates, .
  2. Check hazard switch. See HAZARD SWITCH  under COMPONENT TESTS. Replace hazard switch as necessary. Retest system operation. If hazard switch is okay, go to next step.
  3. 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, perform appropriate pin voltage test under BODY CONTROL ECU PIN VOLTAGE TESTS  under COMPONENT TESTS.
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