Trunk Lid Courtesy Switch Circuits

Turn ignition off and disconnect ATS ECU connector. Close engine hood, all doors and open either front trunk lid or rear trunk lid. Ensure continuity exists between ground and ECU terminal No. 13 (Red/Green wire) with only one trunk lid open at a time. If continuity is not present, repair open in harness or connectors as necessary. If continuity is present in all courtesy switch circuits as specified, replace ATS ECU and retest.