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JGC2008 01-09-2014 01:24 PM

Rear Park Assist Failure
My rear park assist on the driver side lights up instantly inside the cab on the light bar when nothing is behind me. Then shortly after I am in drive the warning on my dash computer says that I need to service my park assist. I think that it is clear that I have a sensor out. However, my question is which one of the driver side two on the rear bumper is the broken one or could they both have gone bad at the same time? How can I figure out which or both need to be replaced?

2005JGC 01-11-2014 12:55 PM

Re: Rear Park Assist Failure
its not easy, especially not having access to a witech (chrysler scan tool). The scan tool will typically tell you which sensor is bad. then you can verify the failure by swapping sensors with another one and ensuring the code follows. Beyond that its going to be a guessing game.

The easiest thing for you to do would be to get 1 sensor then just swap it into each location 1 at a time till it works. That is assuming that it IS a park assist sensor.

bill_de 01-11-2014 01:00 PM

Re: Rear Park Assist Failure
How about swapping with one from the other side? Whether or not the situation changes you have pinpointed the problem.
If after swapping them all, if nothing changes, it's not a sensor. You still have the problem, but saved yourself the cost of a sensor.


JGC2008 01-11-2014 01:36 PM

Re: Rear Park Assist Failure
Thanks for the good ideas. I think switching them around to see what's what is my best option since I do not have the code reader. I will post my findings soon. Thanks again for the great advice to you both. Cheers!

2005JGC 01-12-2014 01:44 AM

Re: Rear Park Assist Failure
Bill, I never had the park assist so I don't have a lot of first hand experience backing my thoughts, but it doesn't tell you where its coming from, just that your getting close (wherever it may be). So moving sensors shouldn't give the driver any different indication other than the fact they are still too close to something. Again, if there was a scanner involved it would pinpoint the sensor and a quick swap would further verify the problem followed but without the proper scanner there is no indication to the driver which one may be bad... furthermore with the issue I wouldn't particularly trust the system to tell me accurate information before it shuts itself off anyway. IF what I have said is not accurate, please correct me, but if it is, the ONLY way to DIY find the bad sensor is with a new one and swapping it in each position.

Also, JGC2008, last one I replaced at the dealer (2 yrs ago or so) we couldnt get a painted on, so have your paint code with you and pick up a bottle of touch up paint!

bill_de 01-12-2014 06:12 AM

Re: Rear Park Assist Failure
It's not just a beeper. On the dash there is a graph with curved lines indicating the right and left rear corners. The number of lines lit indicate how close you are on each side.

From the owner's manual;

The system will indicate a detected obstacle by showing
a single arc in the left and/or right rear regions based on
the obstacle’s distance and location relative to the vehicle.


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