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Symptom Chart: Parking Aid

WARNING: This page is about a different car, the 2016 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
Condition Possible Sources Action
A module does not communicate with the diagnostic scan tool Fuse
Wiring, terminals or connectors
PAM
REFER to: Communications Network
The audible parking aid is inoperative Refer to the Diagnostic Routine GO to Pinpoint Test A 
Continuous or intermittent tone when no obstacles or fault codes are present Dirty or iced over parking aid sensor(s) CLEAN the rear bumper and sensors with high-pressure water.
Ice between parking aid sensor(s) and bezel(s) ALLOW time for the ice between the parking aid sensor(s) and bezel(s) to melt.
Parking aid sensor(s) locked into the bumper incorrectly INSTALL the parking aid sensor(s) into the parking aid sensor bezel(s) correctly.
Parking aid sensors are not aligned correctly CARRY OUT the azimuth system check. REFER to: Azimuth System Check 
The parking aid audio tones are inoperative Wiring, Terminals or connectors
ACM
Audio DSP (if equipped)
To diagnose the audio system, Refer to the appropriate Infotainment article for the procedure.
The parking aid menu is not available in the message center and cannot be deactivated A MyKey® restricted key is in use The parking aid disable feature is not available when a MyKey® restricted key is in use. This is normal operation.