How do you replace one of the parking sensors in a GMC Acadia?
You purchase or otherwise procure a service manual and follow the instructions.
Hi these are the steps: You may have a try ,If you are not confident to do it, You may go to 4s store to replace it.
Step 1
Remove the fasteners inside the rear wheel wells. There are four fasteners on each
side, which you can access by pulling off a plastic liner inside the wheel well. It will be
dirty, so have a rag and soap near by.
Step 2
Loosen the bumper cover from the lower quarter panel by pressing down a clip that
holds the two together. On pre-2001 models, you’ll have to remove one screw in addition to
the clip.
Step 3
Take off the bumper trim by pulling on it.
Step 4
Remove the two 8mm or Torx bolts that hold the bumper cover to the bumper. Use an 8mm
socket or Torx 50 tool on the torque wrench to remove them.
Step 5
Pull on the bumper, but don't completely loosen it because your parking sensor wires
may be connected. If so, disconnect these and lay the bumper on a blanket nearby. Putting
the bumper directly on the ground, especially on pavement, will scratch it.
Step 6
Remove the parts of the old parking sensors: the power supply, display, wires, display
panel, and sensors. The sensors should be connected to the bumper with tape. As you remove
the old sensors, note their placement so you can place the new sensors in the right spot.
Make sure the power supply to the sensors is turned off when you remove it so that you don’t
get shocked when taking out the wires. The wires will be fed through a hole in the rear of
the car that the rear lights’ wires are also fed through. Make sure when you remove these
wires you do so carefully, so you don’t damage the wires for the lights.
Step 7
Tape the new sensors where the old sensors were on the interior of the bumper. Feed
the wires of the sensors through the holes in the car just as the previous wires were fed
through, unless you’re using a wireless system, in which case there are no wires to be fed
to the control panel. If that’s the case, make sure the antenna is connected to the bumper
according to the manufacturer’s instructions. Otherwise, you will need a friend’s help to
feed the wires through the body of the car, because you have to reposition the bumper.
Though the bumper’s only about 20 lbs., it’s easiest to attach to the car with a friend’s
help.
Step 8
Attach the wires of the new system to the power supply in the back of the car. This
power supply also powers the rear lights and should be what the previous parking sensor
system used. The parking sensor kit should come with wire nuts to tie the new wires to the
power supply.
Step 9
Test the new sensor system according to the manufacturer's instructions.
Step 10
Reattach the bolts, clips, trim and fasteners that had held the bumper in place.