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if your question is that my back up sensors stopped being accurate in my rear bumper , yes ive seen that , seems the brushes of auto car washes tend to frost them over making them less able to "see" whats behind the car they do pop out for replacement , just look to see what ones most frosted over (that's the dead one !!)
You have to take bumper cover off .
Remove rear bumper fascia. Refer to Rear Bumper Fascia Replacement . Disconnect electrical from the rear object sensor. Lift the locking tabs on the housing and remove the rear object sensor.
Rear Fascia Push Pin Retainers (Qty: 2)
Rear Fascia Nuts (Qty: 4)
10 N?·m (89 lb in)
Rear Fascia Bolts (Qty: 2)
Rear Fascia Bolts (Qty: 6)
Energy absorber and fascia are removed together. Cannot be separate on vehicle.
if you have something in trailer hitch blocking bumper rear bumper dirty ,damaged rear bumper by sensor[s] or damaged /malfunction of sensor check the wiring and connections behind bumper those circular inserts are the rear sensors
disconnect the connector from the park aid module push the connector and grommet out of the back panel remove screws from lower rear of wheel arch liners remove boot floor trim remove plastic boot closing panel trim remove both boot side trims you wil find a number of 10mm headed bolts around the boot at the sides and back remove these and get someone to help you remove the bumper liner the 2 outer sensors can normally be changed without removing the bumper liner on some models
One of your rear sensors ( 4 of them located on the back bumper) has most likely failed or was damaged. Check the back sensors for any visual damage (they are about the size of a nickle) and panted to match the rear bumpers paint.
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
Remove the tail lamps,remove the plastic retainers from the wheel well area. Remove the retainers below the tailgate opening and below the bumper. Lift up on the sides of the bumper to disengage the sides of the bumper. Pull it back a little and disconnect the connector for the park aid sensors if equipped. Pull back and it is off.