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Home >> Lexus >> 2001 >> GS 430 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Systems >> System Tests >> Test No. 14: Headlight Relay Circuit
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Test No. 14: Headlight Relay 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 headlight relay in ACTIVE TEST. If headlight relay does not operate, go to next step. If headlight relay operates, go to step  3.
  2. Check headlight relay. See HEADLIGHT RELAY  under COMPONENT TESTS. If headlight relay is okay, go to next step. Replace headlight relay as necessary. Retest system operation.
  3. Check circuits for faults between headlight relay, body control ECU No. 2 and battery. 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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