Symptom Chart

Condition	Possible Sources	Action
No communication with the parking aid module	Fuse Circuitry Parking aid module	REFER to MODULE COMMUNICATIONS NETWORK article.
The parking aid is inoperative/does not operate correctly	Circuitry Parking aid sensor alignment Bumper cover Parking aid disable/traction assist switch Parking aid module	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 blocked parking aid sensor(s)	CLEAN the rear bumper and sensors with high pressure water.
	Parking aid sensor holder(s) or parking aid sensor(s) locked into the rear bumper incorrectly	LOCK the parking aid sensor holders correctly into the rear bumper. LOCK the parking aid sensors correctly into the parking aid sensor holders.
	Parking aid sensors are not aligned correctly	CARRY out the azimuth and elevation checks. REFER to Azimuth System Check and Elevation System Check .