Commander 4WD V8-4.7L VIN N (2006)
Ultrasonic park assist sensors in the front or rear bumper fascia allow the park assist system to locate and identify the proximity of nearby obstacles.
These sensors each generate ultrasonic sound pulses when triggered by the park assist module, then signal the module when an echo of the reflected
sound pulses is received. The detection distance range from the front or rear of the vehicle is about 0.3 meters (11.8 inches) to about 1.5 meters (59.1
inches), and the detection height range from the ground is about 0.2 meters (7.8 inches) to about 0.8 meters (31 inches). The detection area extends
somewhat around both sides (corners) of the vehicle.
The park assist display units provide the vehicle operator with both visible and audible warnings indicating the relative range of a detected object. The
front display is visible to the vehicle operator while looking forward. The rear display is visible to the vehicle operator over an inboard shoulder as they
look rearward while backing the vehicle up, but is not visible in a properly adjusted inside rear view mirror while looking forward. Each display contains
two sets of eight Light Emitting Diode (LED) indicator units, one set dedicated to each side of the vehicle, and an audible chime tone transducer. The
LED units are concealed beneath a smoked oval lens and are not clearly visible when they are not illuminated. When the park assist system is active and
no obstacles are detected, the two outermost, amber LED units in the display are illuminated at a reduced intensity to provide visual confirmation that the
system is operating.
Each display provides a visual indication of a detected object by illuminating one or more LED indicators, amber first followed by red, moving toward
the center of the display as the vehicle gets closer to the object. As the vehicle comes to within about 40 centimeters (31 inches) of the object, 1 red
LED is illuminated and the display emits a series of short, intermittent, audible beeps. If the audio system is turned ON, the audio output will be muted
automatically while the park assist audible warning is being generated. The audible warning changes from intermittent beeps to a continuous tone as the
final red indicators are illuminated on 1 or both sides of the display and the vehicle comes to within 30.5 centimeters (12 inches) of a detected object.
When the park assist module monitors a problem in any of the park assist system circuits or components, it stores a fault code or Diagnostic Trouble
Code (DTC) in its memory circuit, sends an electronic message to the instrument cluster, and a SERVICE PARK ASSIST SYSTEM textual message will
appear in the instrument cluster reconfigurable dot matrix display. See the owner s manual in the vehicle glove box for more information on the features,
use and operation of the park assist system.
The hard wired park assist system inputs to and outputs from the park assist module may be diagnosed and tested using conventional diagnostic tools and
procedures. However, conventional diagnostic methods may not prove conclusive in the diagnosis of the park assist system components, the CAN data
bus, or the electronic messages sent to or received from the park assist module by other modules in the vehicle. The most reliable, efficient and accurate
means to diagnose the park assist system, the CAN data bus, or the electronic message inputs and outputs used to provide the park assist system features
requires the use of a diagnostic scan tool.
