The Right Way To Change A Seat Occupancy Sensor

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This undertaking has been a very long time coming for me. Nearly a year in the past I left my windows down throughout a fairly impressive thunderstorm (accidentally pressed the unlock button on my key in my pocket while I was strolling away from the automotive and both home windows and the sunroof opened), and due to some reasonably drastic measures on my half to dry out the automobile the one lasting injury was that I now had a seatbelt and airbag warning gentle on my dashboard. I used to be pretty quickly in a position to find out that these lights had been being brought on by a faulty passenger occupancy sensor. Sadly, BMW does not promote just the sensor, however fairly the entire bottom seat cushion for a cool $1200. Well I did not want to do this. So I managed to make it via many a month with these annoying warning lights until in the future I happened upon a listing on a salvage car components site that was selling a standalone seat sensor! I snatched up the part after which spent a complete day switching them out. In researching easy methods to get into the seats I was unable to search out much of anything useful on this forum so I figured I ought to write up this DIY to assist others out. 1. Remove the seat (duh). You will use the T50 bit to take away all 4 screws holding the seat down. Once loose, go to the trunk and disconnect the battery. Again within the cabin, push the chair again so you'll be able to see underneath and disconnect the yellow wiring harness. There is a black tab on the aspect which you could match a small screwdriver in. Pull that tab out so far as it's going to go, then pull out the wiring harness. There's a separate wire connector on prime too: squeeze the sides to launch it and disconnect that too. Now pull the seat out of the automobile. This is simpler should you additionally take the headrest off. 2. Now you are going to must remove the plastic cowl on the righthand aspect of the seat that has the seat controls on it. This piece is held on with 5 plastic tabs: Three are seen on the bottom of the piece and a couple of are hidden inside close to the top. I was able to get all but the righthand inside tab using simply my hands. To get that last tab I had to bend a hook shape into a chunk of thick wire and fish that by means of to the tab and pull the tab while pulling up on the entire piece. That was tough. As soon as off, you may see the right way to controls are wired up, just unplug them so you possibly can remove the trim fully. 3. As soon as the outer plastic trim is off, you may be confronted with a second plastic piece. To take away this there's only one bolt (T30) and you then simply should wiggle it around till it pops off. There are some wires hooked up to this piece with a plastic rivet which doesn't appear to be it is meant to come back off so I left this piece still partially attached to the seat. 4. Subsequent, there's another plastic trim piece on the other facet of the seat on the again corner. Use the T20 bit to remove the screw, and pull the piece off. 5. There's now just one final piece of trim left, and it is a ache. It is the lower plastic piece on the entrance of the chair. You may see that there are three attachment points. The outer two are easy: simply depress the outward going through tab with a small screwdriver and pull outward on the piece. They will pop out. The center attachment level is harder because the tab you'd need to press in is actually facing inward in direction of the seat so you cannot get to it. You may, however, use a small screwdriver and put the head contained in the attachment level, angling it so that it catches on the tab on the inside, and pull the piece downward. It's going to come off ultimately. 4. Now it is time to start eradicating the leather-based! The purpose of removing all this plastic trim was to be ready to easily and absolutely take away your complete seat cushion. Note how all across the seat the leather is stitched to this plastic lip. Now that we have eliminated all of the trim, you possibly can pull this plastic lip off of its hold on the seat frame. There's one lengthy piece for your entire front, one medium piece in the again, and two brief pieces, one on both again aspect of the chair. Also you'll want to undo the little bits on the again corners the place the leather is held by a plastic button and is stretched over a steel nub. Now we will pull the back flap through the hole in between the upper and decrease halves of the chair after which, from the again forward, pull the cushion up. There's only one final level of attachment: just before the leg extension there's a plastic rib that's attached to the seat frame. This rib is simply held in by some metal tabs, you can start on one end and pull up and it will come out. 5. Now for the true fun part: we need to remove the leather from the foam cushion so that we will get on the occupancy sensor. On the underside of the cushion, starting from the back, you may see many metal hogties. I used a pair of pliers to remove them. Just pinch the ring and switch it till the ends are going through you, then pull them apart and take away the ring. There are 4 on the surface of the cushion to take away. Then on the inside you may need to take away a bunch more. I did 11 rings in complete, I feel. When you get get deep sufficient between the foam and the leather, you can totally take away the old sensor. It is glued in on the entrance and on both aspect bolsters. 6. Put in your new sensor! I glued mine again in with some Gorilla Glue Gel. Be careful as a result of not much seems to stick with that foam. I probably went by means of 4-5 different glues before I found the Gorilla Glue. 7. It's all downhill from right here. Now it's essential reattach the leather-based to the foam. To do that, I used zip ties. Simply put them in the exact spots where you eliminated the steel rings. For a number of the harder components to get a zip tie in place, I used to be capable of push my metallic wire through the opening and use it as a information for the zip tie. 8. Reattach that sucker back to the seat body. Nothing too tough here, just take it slow and go within the reverse from before. It's going to all fit. Remember to plug in your new seat sensor to the chair. 9. Reinstall the chair. Overall this venture took me about 6-eight hours. Eradicating the plastic trim is tough, removing the hog rings is a pain, and getting the leather reattached to the foam takes time. That said, it's all fully doable with minimal instruments. I've written this up as greatest I can, however I am certain I left out just a few steps.