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Home >> Lexus >> 1998 >> LS 400 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control System >> Circuit Tests >> Taillight Relay Circuit
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Taillight 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. Check Taillight Relay Using Scan Tool

    Using scan tool, operate taillight relay in ACTIVE TEST. If taillight relay does not operate (taillights 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 Taillight Relay

    Check taillight relay. See TAILLIGHT RELAY under COMPONENT TESTS. If taillight relay is okay, go to next step. Replace taillight relay as necessary. Retest system operation.

  3. Check Circuits

    Check circuits for faults between taillight relay, body control ECU 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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