How You Can Replace A Seat Occupancy Sensor

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29 September 2021

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This challenge has been a very long time coming for me. Almost a yr ago I left my home windows down during a fairly impressive thunderstorm (by chance pressed the unlock button on my key in my pocket whereas I used to be strolling away from the automotive and each home windows and the sunroof opened), and due to some reasonably drastic measures on my part to dry out the car the only lasting damage was that I now had a seatbelt and airbag warning mild on my dashboard. I was pretty shortly able to find out that these lights have been being caused by a faulty passenger occupancy sensor. Unfortunately, BMW doesn't sell just the sensor, however fairly the whole backside seat cushion for a cool $1200. Effectively I did not need to do that. So I managed to make it via many a month with these annoying warning lights until one day I occurred upon a list on a salvage automotive parts site that was selling a standalone seat sensor! I snatched up the part after which spent a whole day switching them out. In researching easy methods to get into the seats I was unable to find much of something helpful on this forum 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 four screws holding the seat down. Once free, go to the trunk and disconnect the battery. Again within the cabin, push the chair again so you possibly can see beneath and disconnect the yellow wiring harness. There is a black tab on the facet that you would be able to match a small screwdriver in. Pull that tab out as far as it can 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 car. This is less complicated when you also take the headrest off. 2. Now you're going to need to take away 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 visible on the bottom of the piece and 2 are hidden inside near the top. I used to be able to get all however the righthand inside tab using simply my hands. To get that last tab I needed to bend a hook shape into a chunk of thick wire and fish that through to the tab and pull the tab whereas pulling up on the entire piece. That was difficult. Once off, you will see how to controls are wired up, simply unplug them so you'll be able to take away the trim fully. 3. As soon as the outer plastic trim is off, you'll be confronted with a second plastic piece. To take away this there's just one bolt (T30) and then you definitely simply need to wiggle it around till it pops off. There are some wires attached to this piece with a plastic rivet which doesn't appear like it's meant to come back off so I left this piece nonetheless partially attached to the seat. 4. Next, there's one other plastic trim piece on the other facet of the seat on the again nook. Use the T20 bit to take away the screw, and pull the piece off. 5. There's now just one last piece of trim left, and it's a pain. 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 dealing with tab with a small screwdriver and pull outward on the piece. They'll pop out. The center attachment point is harder as a result of the tab you'd need to press in is definitely facing inward in direction of the seat so that you can't get to it. You can, nonetheless, use a small screwdriver and put the head inside the attachment point, angling it so that it catches on the tab on the inside, and pull the piece downward. It's going to come off finally. 4. Now it's time to start removing the leather-based! The point of removing all this plastic trim was to be able to easily and fully take away your entire seat cushion. Be aware how all across the seat the leather-based is stitched to this plastic lip. Now that we've eliminated all the trim, you can pull this plastic lip off of its hold on the seat body. There's one lengthy piece for the complete entrance, one medium piece in the again, and two brief pieces, one on both back side of the chair. Additionally be sure to undo the little bits on the back corners where the leather-based is held by a plastic button and is stretched over a metal nub. Now we are able to pull the back flap by means of the gap in between the upper and lower halves of the chair after which, from the back forward, pull the cushion up. There's just one final level of attachment: simply earlier than the leg extension there is a plastic rib that's attached to the seat frame. This rib is just held in by some metallic tabs, you can begin on one finish and pull up and it's going to come out. 5. Now for the real fun half: we have to take away the leather from the foam cushion in order that we are able to get on the occupancy sensor. On the underside of the cushion, beginning from the back, you'll see many steel hogties. I used a pair of pliers to take away them. Simply pinch the ring and turn it till the ends are dealing with you, then pull them apart and remove the ring. There are 4 on the skin of the cushion to take away. Then on the inside you will must remove a bunch extra. I did 11 rings in complete, I believe. When you get get deep sufficient between the foam and the leather-based, you may fully remove the outdated sensor. It's glued in on the front and on both aspect bolsters. 6. Put in your new sensor! I glued mine again in with some Gorilla Glue Gel. Watch out as a result of not a lot seems to stick to that foam. I most likely went by way of 4-5 different glues earlier than I found the Gorilla Glue. 7. It is all downhill from right here. Now it's essential reattach the leather to the foam. To do that, I used zip ties. Simply put them in the precise spots the place you removed the steel rings. For among the more difficult parts to get a zip tie in place, I used to be able to push my metallic wire via the opening and use it as a information for the zip tie. 8. Reattach that sucker again to the seat body. occupancy light switch , just take it gradual and go within the reverse from before. It'll all fit. Don't forget to plug in your new seat sensor to the chair. 9. Reinstall the chair. Total this mission took me about 6-eight hours. Eradicating the plastic trim is tough, eradicating the hog rings is a ache, and getting the leather reattached to the foam takes time. That mentioned, it's all fully doable with minimal instruments. I've written this up as greatest I can, but I'm positive I unnoticed just a few steps.

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