Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
FLIP-UP GLASS RELEASE MOTOR
FLIP-UP GLASS RELEASE SWITCH
GROUND CIRCUIT OPEN
TAILGATE SWITCH GROUND
FLIP-UP GLASS RELEASE MOTOR DRIVER WIRE OPEN
FLIP-UP GLASS RELEASE SWITCH SENSE OPEN
BODY CONTROL MODULE - FLIP-UP GLASS RELEASE MOTOR DRIVER OPEN
BODY CONTROL MODULE - FLIP-UP GLASS RELEASE SWITCH SENSE OPEN