Cross traffic system check check rear parking aid
It could be the speaker that alerts you when you back up. If it is going bad, you will get a cross traffic system fault. A replacement speaker will cost you $20 or less and a half an hour of your time if you are handy. (It is possible the fault could be caused by something else, but my speaker was making a screeching sound for several weeks, then stopped working altogether. After reading several forums and blogs, I felt confident the speaker was my issue.)
I have a 2010 Milan with the Sony speakers. I read about taking out the seat to access the speaker, but did not want to do that. found several sites that said one could go in from the top, so that's what I did. The speaker is on the driver's side.
The speaker grill is made of plastic and has tabs down the sides. I used a long, thin flat screwdriver to pop it out. You may not get it back on perfectly when you are done. If that's important to you, then you may want to remove the seat instead. You can also use double-sided tape to hold it in.
After removing the grill, I removed the stereo speaker. I used a 7mm socket wrench. The backup speaker is to the right (toward the outside of the car) under the deck. I went into the trunk and pushed out the push pins to remove the speaker. See this site for good pictures: https://imgur.com/gallery/NCr3w
After removing the speaker from its moorings, remove the connector by using a small flat screwdriver to push on the part of the connector showing through where it connects to the speaker.
The replacement speaker came with tape. I found that easier than using the push pins again. I would use double-sided tape if it did not come with it.
The stereo speaker went back in rather easily, then the grill, which is not perfect, but again, I did not have to remove any seats.
SOURCE: I have a 2006 Ford Explorer and 2 of my park aid
You only need to remove the bumper cover. Remove both tail lamp assemblies. Under the tail lamps you will a 10mm and a 8mm bolt, remove these. Look into each rear wheel well rearward and you will find a T20 torx screw on both sides, remove these. On the top of the rear bumper, between the bumper and the bottom of the liftgate opening you will find 6 to 8 plastic rivets that can be removed by pulling the center pins out, remove these. At this point you should be able to lift upward and rearward and release the bumper cover. Once the cover is free you must disconnect the electrical connector to the sensor wiring harness. With the bumper cover on the ground or a bench, you will see 4 9/16" nuts that hold the styrofoam bumper cushion to the bumper cover, remove these. Now you should be at the point where the backup sensors are accessable. When you install the new sensors be sure your electrical connectors click when they connect. these connectors go on hard and if they don't click you will be doing this job again. Reassemble in reverse order.
Hope this helps
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