Disconnect and isolate the battery negative cable.
Remove rear wiper arm. See: Wiper Arm Service and Repair Wiper Arm - Removal Rear.
Remove liftgate trim panel. See: Body and Frame Doors, Hood and Trunk Trunk / Liftgate Interior Trim Panel Service and Repair Liftgate Trim Panel - Removal.
Disconnect wire connector from rear wiper motor.
Remove screws holding rear wiper motor to liftgate.
Remove wiper motor (1) from liftgate.