Patent ID: RE40878

Claim:
A warning sensor system for a vehicle comprising: a sensor head mountable in an aperture of a trailer receiver attached to a rear of the vehicle and from which receiver a trailer ball mount is absent, wherein said sensor head includes a transceiver emitting wireless signals rearwardly of the vehicle and detecting echoes from the signals reflected from an object behind the vehicle; an electrical coupling connected to the sensor head and connectable to a matching coupling on said receiver; and an alarm device mounted in a passenger compartment of said vehicle and electrically connected to in electrical communication with said sensor head, wherein said sensor transceiver includes a mounting post which inserts into the aperture of the receiver, a plate mounted on an end of the mounting post and a hood, and the post, plate and hood are slidably engaged with the receiver, wherein the transceiver further includes an electronics board mounted on said plate and said hood provides a portion of the outer housing for the transceiver.