I don't know the locations or specifically which sensor that code would indicate - but there are two items of concern in any door that involve pressure sensors: One that reverses or stops a window from rising if it is obstructed; and the other, a side impact sensor for the airbag. Both are safety related items.
Thanks! Got the door off, on my 2007 s550 there are only 2 screws either dude under the armrest on the rear right door. I didn’t take off the grill cover as shown on the video. Watch those panel pin clips. I broke 1. They are brittle. I did have trouble trying to unplug the tweeter wire from the panel, do I left it on and wired the panel out of the way to keep that wire unstressed. The door crash sensor is what is was replacing. Be prepared it’s riveted in. Had to drill the rivet top off, easy to do and pop the new on on what was left of the rivet stud. Added a bit of job weld to keep it in place, reset the srs error and bingo.
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