Truck Trend Garage: 2005 Cadillac Escalade EXT Parking Assist Stopped Working

Backup Plan

Alex Steele
May 24, 2011
Question: My 2005 Cadillac Escalade EXT was rear-ended and I had it repaired at a good body shop. Everything looks great, except the rear parking assist stopped working. They replaced everything including sensors in the bumper, wiring, and module. They can't figure it out. What else could be wrong?
Photo 2/2   |   Backup Plan
Answer: The rear-object sensor-control module is located under the rear seat. It must've been some crash if the module itself was damaged on impact. The fault can be in several locations; it may be as simple as a connector not fully seated into one of the four distance sensors in the rear bumper. If the red light on the rear parking assist display flashes when the transmission is put in reverse, there are trouble codes stored in the module, which should lead you in the right direction. The trouble codes can be retrieved without a scan tool. There's a procedure where grounding a diagnostic connector will flash the codes at the three lights (two amber, one red) on the rear parking assist display. Get it to a technician with the proper diagnostic information, or you could get the procedure yourself with a subscription to Please note there is a rear-parking-assist disable switch above the driver information center (DIC). Make sure it's on. Don't go any further without retrieving the diagnostic trouble codes.

If you have a technical question regarding your pickup, SUV, or van, feel free to contact Alex, a master technician with the National Institute for Automotive Service Excellence. Send a letter to him in care of Truck Trend Garage, 831 S. Douglas Street, El Segundo, CA 90245, or e-mail us at Please include the VIN with your question. Due to the volume of questions received every month, we cannot guarantee that everyone's question will be personally answered or will appear in the magazine.

Can't wait for help with a problem you're having with your Truck or SUV? Ask the expert we trust here at Truck Trend Garage -- visit Alex Steele at
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