How To Replace A Seat Occupancy Sensor

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This project has been a very long time coming for me. Virtually a year in the past I left my home windows down during a pretty spectacular thunderstorm (by accident pressed the unlock button on my key in my pocket whereas I used to be walking away from the automobile and both home windows and the sunroof opened), and as a consequence of some slightly drastic measures on my part to dry out the car the only lasting injury was that I now had a seatbelt and airbag warning mild on my dashboard. I was fairly rapidly able to determine that these lights had been being caused by a faulty passenger occupancy sensor. Unfortunately, BMW doesn't sell just the sensor, however relatively all the bottom seat cushion for a cool $1200. Effectively I did not need to try this. So I managed to make it by means of many a month with those annoying warning lights till in the future I occurred upon a list on a salvage car components site that was promoting a standalone seat sensor! I snatched up the half after which spent a whole day switching them out. In researching how to get into the seats I was unable to find a lot of something helpful on this discussion board so I figured I should write up this DIY to assist others out. 1. Take away the seat (duh). You will use the T50 bit to take away all 4 screws holding the seat down. Once unfastened, go to the trunk and disconnect the battery. Again within the cabin, push the chair back so you'll be able to see beneath and disconnect the yellow wiring harness. There is a black tab on the side which you could fit a small screwdriver in. Pull that tab out as far as it'll go, then pull out the wiring harness. There's a separate wire connector on top too: squeeze the sides to release it and disconnect that too. Now pull the seat out of the car. This is less complicated in the event you also take the headrest off. 2. Now you're going to need to take away the plastic cover 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 underside of the piece and 2 are hidden inside near the top. I used to be able to get all but the righthand inside tab using simply my arms. To get that final tab I needed to bend a hook form into a chunk of thick wire and fish that by to the tab and pull the tab while pulling up on the whole piece. That was troublesome. Once off, you may see the best way to controls are wired up, simply unplug them so you possibly can take away the trim entirely. 3. Once the outer plastic trim is off, you will be confronted with a second plastic piece. To remove this there's just one bolt (T30) and then you just need to wiggle it around until it pops off. There are some wires hooked up to this piece with a plastic rivet which doesn't seem like it is meant to return off so I left this piece nonetheless partially hooked up to the seat. 4. Next, there's another plastic trim piece on the opposite facet of the seat on the back 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 factors. The outer two are simple: simply depress the outward going through tab with a small screwdriver and pull outward on the piece. They'll pop out. The middle attachment point is tougher because the tab you'd wish to press in is actually going through inward in the direction of the seat so that you can't get to it. You can, nevertheless, use a small screwdriver and put the top contained in the attachment point, angling it so that it catches on the tab on the inside, and pull the piece downward. It will come off eventually. 4. Now it is time to start eradicating the leather! The purpose of removing all this plastic trim was to be ready to easily and fully remove the complete seat cushion. Note how all around the seat the leather is stitched to this plastic lip. Now that we have removed all of the trim, you possibly can pull this plastic lip off of its hold on the seat body. There's one long piece for the whole entrance, one medium piece in the again, and two brief items, one on both again facet of the chair. Also make sure to undo the little bits on the back corners the place the leather is held by a plastic button and is stretched over a metal nub. Now we are able to pull the again flap by the gap in between the upper and lower halves of the chair after which, from the back ahead, pull the cushion up. There's only one last level of attachment: simply before the leg extension there is a plastic rib that is hooked up to the seat body. This rib is simply held in by some steel tabs, you can begin on one end and pull up and it'll come out. 5. Now for the actual enjoyable part: we have to remove the leather-based from the foam cushion in order that we can get on the occupancy sensor. On the underside of the cushion, beginning from the again, you'll see many metallic hogties. I used a pair of pliers to remove them. Simply pinch the ring and switch it till the ends are dealing with you, then pull them apart and take away the ring. There are 4 on the skin of the cushion to remove. Then on the inside you will must remove a bunch more. I did eleven rings in total, I feel. Once you get get deep enough between the foam and the leather-based, you possibly can totally take away the outdated sensor. It's glued in on the front and on each aspect bolsters. 6. Put in your new sensor! I glued mine back in with some Gorilla Glue Gel. Watch out because not a lot seems to persist with that foam. I most likely went through 4-5 totally different glues earlier than I found the Gorilla Glue. 7. It's all downhill from right here. Now you might want to reattach the leather-based to the foam. To do that, I used zip ties. Just put them in the precise spots the place you removed the metal rings. For a number of the harder components to get a zip tie in place, I used to be capable of push my metal wire through the opening and use it as a guide for the zip tie. 8. Reattach that sucker back to the seat frame. Nothing too difficult here, just take it sluggish and go in the reverse from earlier than. It will all fit. Remember to plug in your new seat sensor to the chair. 9. Reinstall the chair. Total this venture took me about 6-eight hours. Removing the plastic trim is troublesome, removing the hog rings is a pain, and getting the leather reattached to the foam takes time. That stated, it is all utterly doable with minimal instruments. I've written this up as finest I can, however I am positive I neglected a few steps.