Towbar Enabling
WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
If the vehicle has a factory Trailer Hitch installed and the owner uses a factory ball mount package there is a personalization option available to allow the Rear Park Assist system to work with the factory Trailer Hitch.
This option can be selected using the Vehicle Personalization in the Radio and selecting Collision/Detection Systems. Press the MENU/SELECT knob when Park Assist is highlighted. Turn the knob to select Tow Bar. Press the knob to confirm and go back to the last menu.