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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).

  1. Check Anti-Theft Horn Using Scan Tool

    Connect a jumper wire between DLC1 connector terminals E1 and Tc. See Figure. 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 TROUBLE SHOOTING SYMPTOMS table.

  2. Check Anti-Theft Horn

    Check anti-theft horn. See ANTI-THEFT HORN under COMPONENT TESTS. If anti-theft horn is okay, go to next step. Replace anti-theft horn as necessary. Retest system operation.

  3. Check Circuits

    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 TROUBLE SHOOTING SYMPTOMS table.
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