Test No. 5
NOTE:
Test procedure is based on the assumption that headlights operate properly using headlight switch, but will not operate with anti-theft system. Headlight relay may also be referred to as headlight control relay.
- Check Voltage At Terminal No. 10 At Anti-Theft System Electronic Control Unit (ECU)
Access anti-theft system ECU. Anti-theft system ECU is located behind glove box and uses a 12-pin and a 22-pin harness connector. See Figure. - Turn ignition off. Disconnect harness connectors at anti-theft system ECU. Check voltage between ground and terminal No. 10 (Red/Black wire). See Fig 1. See WIRING DIAGRAMS .
- If battery voltage does not exist, go to next step. If battery voltage exists, replace anti-theft system ECU. See ANTI-THEFT SYSTEM ECU under REMOVAL & INSTALLATION.
- Check for defective harness connectors between terminal No. 10 (Red/Black wire) at anti-theft system ECU changing to Sky Blue wire and back to Red/Black wire at headlight relay. See WIRING DIAGRAMS . Headlight relay is located in engine compartment fuse/relay box near battery. See Figure. Repair harness connectors or wiring as necessary. To check headlight relay, see HEADLIGHT RELAY under COMPONENT TESTS.