Anti-Theft Horn 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.
- Connect a jumper wire between DLC1 connector terminals E1 and Tc. See Fig 1. Using scan tool, operate anti-theft horn in ACTIVE TEST. If anti-theft horn does not operate, go to next step. If anti-theft horn operates, go to next test listed in appropriate SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING .
- Check anti-theft horn. See ANTI-THEFT HORN under COMPONENT TESTS. Replace anti-theft horn as necessary. Retest system operation. If anti-theft horn is okay, go to next step.
- Check circuits for faults between anti-theft horn and body control ECU No. 1. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING .