Principles of Operation

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The parking aid sensors detect objects approximately 1.6 m (5.3 ft) from the rear of the vehicle, 50 cm (1.6 ft) from the rear side of the vehicle, and 16 cm (6 in) above the ground. The parking aid module calculates the distance to an object within the 170 degree semicircular azimuth area around the rear of the vehicle. A 750 Hz variable warning tone is generated from a parking aid speaker attached to the parking aid module. The parking aid speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 25 cm (10 in) of the sensors, the warning tone becomes continuous.

The parking aid system is enabled when the ignition switch is in the RUN position and the REVERSE (R) gear is selected. The parking aid system is disabled if a fault is detected in 1 of the 4 sensors, the parking aid speaker, or the parking aid module. This is indicated by the parking aid disabled warning in the message center. The parking aid module is on the medium speed controller area network (MS-CAN) and can be diagnosed with a scan tool.

The parking aid module communicates with the scan tool, the smart junction box (SJB) and the instrument cluster. The following chart describes network messages used by the parking aid module:

NOTE: Both the medium speed controller area network (MS-CAN) and the high speed controller area network (HS-CAN) are used for inter-module communication. A gateway message is transferred from one network to another network through the instrument cluster. Refer to MODULE COMMUNICATIONS NETWORK .

PARKING AID MODULE NETWORK COMMUNICATION MESSAGES

Broadcast Message	Originating Module	Network Type	Receiving Module
Ignition switch position	Smart junction box (SJB)	MS-CAN	Parking aid module
Parking aid enabled status	Instrument cluster	MS-CAN	Parking aid module
Parking aid system status	Parking aid module	MS-CAN	Instrument cluster
Transmission selector (PRNDL) range	PCM	HS-CAN	Instrument cluster
Transmission selector (PRNDL) range (gateway)	Instrument cluster	MS-CAN	Parking aid module
Vehicle speed	PCM	HS-CAN	Instrument cluster
Vehicle speed (gateway)	Instrument cluster	MS-CAN	Parking aid module