Trunk Lid Courtesy Switch Circuits

Turn ignition off and disconnect ATS ECU connector. Open trunk lid and close all other doors and engine hood. Ensure continuity exists between ground and terminal B10 (with power door locks, Red/White wire) or No. 13 (without power door locks, Red/White wire). 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.