Key Unlock Warning Switch Circuit

Turn ignition off and disconnect ATS ECU connector. Insert ignition key into ignition lock cylinder. Ensure continuity exists between ground and ECU connector terminal A20 (Light Green wire). If continuity is not present, repair open in unlock warning switch circuit. If continuity is present, remove key and ensure continuity is not present. If continuity is present, repair short in unlock warning switch circuit. If continuity is not present, replace ATS ECU and retest.