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Test 10

  1. Anti-Theft Horn Circuit  - Turn ignition switch to OFF position and disconnect ATS ECU connectors. Ensure battery voltage exists between ground and ATS ECU connector "B" terminal No. 4 (White/Blue wire). If battery voltage does not exist, check HAZ/HORN fuse. If HAZ/HORN fuse is okay, go to next step.
  2. Anti-Theft Horn Operation  - Turn ignition switch to OFF position. Locate anti-theft horn and disconnect horn 2-pin connector. See COMPONENT LOCATIONS . Connect battery positive lead to one terminal. Connect battery negative lead to other terminal. If anti-theft horn does not blow, replace horn. If anti-theft horn is okay, repair open or short in harness or connectors between HAZ/HORN fuse and ATS ECU as necessary. If harness and connectors are okay, check ATS ECU. See PIN VOLTAGE TESTS . If found to be defective, replace ATS ECU and retest system.
  3. Standard Horn Circuit  - Turn ignition switch to OFF position and disconnect ATS ECU connectors. Ensure battery voltage exists between ground and ATS ECU connector "B" terminal No. 11 (Green/Red wire). If battery voltage does not exist, ensure continuity exists between standard horn relay terminals No. 1 and 2. If standard horn relay is okay, repair open or short in harness or connectors between standard horn relay and ATS ECU as necessary. If battery voltage exists, check ATS ECU. See PIN VOLTAGE TESTS . If found to be defective, replace ATS ECU and retest system.
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