Diagnostic Aids

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Manually pushing in the ignition lock cylinder solenoid pin will allow the ignition key to be turned to OFF.
The ignition lock cylinder control switch is part of the shift lock solenoid/switch assembly.
The retained accessory circuit feeds the voltage to the automatic transmission shift lever.