Rear Lock
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Control for the auxiliary climate control system can be controlled by the front or rear climate controls. When REAR CONTROL is selected on the front auxiliary climate controls, the rear auxiliary climate controls can be used. When REAR CONTROL is not selected, REAR LOCK is illuminated in the rear auxiliary climate controls. The rear auxiliary climate controls does not work when the REAR LOCK indicator is illuminated and only the front auxiliary climate controls may be used.