Operation

OPERATION

The module has a number of functions:

- Supply voltage to the sensors and display.
- Disconnection of the display with bus idle and over voltage Vmax.
- Triggering the sensors.
- Analyze echo delay times and calculate obstacle distances.
- Bi-directional data communication to the display for diagnosis.
- System diagnostics - diagnosis and error handling (sensors, display, module).
- Data exchange over the Programmable Communication Interface (PCI) data bus.

The system detection length from the rear of the vehicle is about 0.3 - 1.5 meters (1 - 5 ft.). This area extends around the rear side of the vehicle. The system detection height from the ground is about 0.2 - 1.5 meters (1 - 5 ft.). The radio mutes when the system activates its audible tone.

When the driver selects Reverse, the system scans for objects behind the vehicle using four sensors located in the rear bumper. Objects can be detected from up to 1.5 meters (5 ft.). A warning display above the rear window provides both visible and audible warnings indicating the range of the object.

The system is active only when the vehicle is in reverse for vehicle speeds less than 16 km/h (10 mph). If the vehicle's Parking/Emergency Brake is applied, the system is deactivated.

The display contains two sets of yellow and red Light Emitting Diode's (LED's) that the driver can see as they look over their shoulder while backing up. Each side of the vehicle has its own warning LED's. The system provides a visual warning by illuminating one or more yellow LED's as the vehicle gets closer to the object. As the vehicle continues to approach the object, one red LED is illuminated and the system emits a series of short beeps. The tone will remain constant and both red LED's are illuminated once the vehicle is within 30.5 cm (12 inches) of the object.

The system can be turned ON or OFF through the Electronic Vehicle Information Center (EVIC) when the vehicle is in PARK. If the park assist system is turned OFF, a single chime will sound and the EVIC will display the following message "REAR PARK ASSIST OFF", when the vehicle is in reverse.

- Ensure that the rear bumper is free of dirt and debris to keep the system operating properly.
- Jackhammers, large trucks, and other vibrations could affect the performance of the system.
- Ensure that the parking brake is not applied.

If "Service Park Assist System" appears in the EVIC after making sure the rear bumper is clean, proceed to diagnose the system using a scan tool and the appropriate diagnostic information.

To diagnose the Park Assist Module, use a scan tool and the appropriate diagnostic information.