Owners of 2007-2014 Cadillac Escalade vehicles may complain that the power liftgate is inoperative from all switches and the keyless entry transmitter only when the ignition is in the off position. If the ignition is in the accessory or run position, the liftgate will operate correctly.
Check for power on the Accessory Wake Up Data Line going to the ECM and the TCM.
With the key in the accessory position, check for battery voltage on circuit 5985 going to pin 18 (2007 and 2010 to 2014 models) or pin 31 (2008-2009 models) of connector 1 of the ECM and pin 11 (MT1 transmission) or pin 9 (for MYC transmission) to the TCM.
If no voltage is present with the key in the accessory position, check for a wiring or pin fit concern.