Symptom Chart

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
No communication with the parking aid module (PAM)	Fuse Wiring, terminals or connectors PAM	REFER to MODULE COMMUNICATIONS NETWORK article.
The parking aid is inoperative/does not operate correctly	Wiring, terminals or connectors Parking aid sensors alignment PAM Rear bumper cover	Go to PINPOINT TEST A .
Continuous or intermittent tone when no obstacles or fault codes are present (certain obstacles may appear "stealthy" to the system, depending on geometric shape, size and material)	Dirty or iced over parking aid sensor(s)	CLEAN the rear bumper and sensors with high-pressure water.
	Parking aid sensor bezel(s) or parking aid sensor(s) locked into the rear bumper cover incorrectly Parking aid sensors are not aligned correctly	REMOVE and correctly INSTALL the parking aid sensor(s) and or bezel(s) as necessary. REFER to PARKING AID SENSOR .
	Parking aid sensor(s) PAM	CARRY OUT the azimuth system check and elevation system check. REFER to AZIMUTH SYSTEM CHECK and ELEVATION SYSTEM CHECK .
The Audio Control Module (ACM) volume does not decrease when the transmission is selected to reverse and the reverse sensing system is enabled	Wiring, terminals or connectors PAM ACM	Go to PINPOINT TEST I .