Test No. 4
NOTE:
Test procedure is based on the assumption that standard horns operate properly using horn pad on steering wheel, but will not operate with anti-theft system.
- Check Voltage At Terminal No. 12 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. 12 (Green/Orange wire). See Fig 1. See WIRING DIAGRAMS .
- If battery voltage does not exist, go to next step. If voltage exists, replace anti-theft system ECU. See ANTI-THEFT SYSTEM ECU under REMOVAL & INSTALLATION.
- Check for damaged harness connectors and Green/Orange wire between horn relay changing to Sky Blue and back to Green/Orange wire to anti-theft system ECU and horn relay. See WIRING DIAGRAMS . Horn relay is located in engine compartment fuse/relay box near battery. See Figure. Repair harness connectors or wiring as necessary. To check horn relay, see HORN RELAY under COMPONENT TESTS.