Inspection Procedure

For circuit wiring diagram, see Fig 1.

1. Check the headlight relay using the hand-held tester. Connect the hand-held tester to DLC3. See Figure. Check that the headlight relay can operate in ACTIVE TEST. If the headlight relay is normal, the headlights come ON. In case that the headlight relay activates but the headlight will not come on, check the headlight circuit. If the results are OK, perform the next test procedure of the problem symptom. See BODY ECU NO. 1 PROBLEM SYMPTOM INDEX  table. If the results are not OK, go to the next step.
2. Check the headlight relay. See RELAYS article under COMPONENT TESTS in STEERING COLUMN SWITCHES. If the results are OK, go to the next step. If the results are not OK, replace the headlight relay.
3. Check for short to power, short to ground and continuity in the wiring harness and connector between the headlight relay and the body ECU No. 2. If the results are OK, perform the next test procedure of the problem symptom. See BODY ECU NO. 1 PROBLEM SYMPTOM INDEX  table. If the results are not OK, repair or replace the wiring harness or connector.

Fig 1: Headlight Relay Circuit Wiring Diagram

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