Make sure all the plugs/harnesses for each individual rear sensor are plugged in. Each sensor has it's own wire plug, and then there is 1 main one (on the driver's side). I found this out the hard way when I installed my Mopar hitch. I initially unplugged each individual harness -- only to later find out I needed to only unplug the main one. I didn't have to remove - battery in order to reset anything after the job was complete.
In your case, the shop has to fix it for you if it worked prior to them touching it.
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Traded '09 Aspen: Silver, 2wd, Hemi, Mopar Running Boards, Mopar Splash Guards, 20% tint, aFe Pro Dry S filter, Wrangler Silent Armors, 11" Overhead DVD.
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