Minimum Detectable Object Locations.

Fig 1: Locating Minimum Detectable Object

Courtesy of FORD MOTOR CO.

Turn the ignition to the ON position, engine off.
NOTE: The object used, in this system check can be fabricated using a 7.62 cm (3 inches) diameter pipe, 99.06 cm (39 inches) in length.

NOTE: The following system check should be carried out with the vehicle on a level surface.

NOTE: The parking aid module (PAM) system will default to on when the ignition key is cycled from the OFF position to the ON position.
Set the parking brake on.
Place the gear shift in R (reverse).
Verify that the PAM detects the object above when placed in the five specified locations (P1, P2, P3, P4 and P5).