Seats: occupancy sensor transplant and leather repair
- Thread starter PawnSacrifice
- Start date
So has anyone done this with heated seats yet?
I have the exact same seats but with heated elements. I want to be able to fit a pre-facelift m-sport seat sensor and box onto my facelift seat.
It looks quite straight forward, more so if the mat is the right one for the seat. The only thing I'm wondering is where do the heating elements go?
Are they floating between the sensor and the leather, or glued to the back of the leather, or worse still, glued over or *under* the occupancy sensor?
Any advice much appreciated.
PS, the seat leather goes baggy when they get get/damp, probably from bad storage in accident damaged cars at breakers. Mine were baggy but after a day in the car with the heaters on full blast and heated seats turned on they were fine.
Great thread by the way!
Two questions:
Has anyone else fitted these seats and plugged the sensor from a facelift occupancy sensor into their yellow multi-plug? Apart from the light on the dash they actually do work fully, sensing occupants when they are in the seat etc etc...
And,
Has anyone done this mod have INPA installed?
I still have a fault, but not one that brings up a warning light. It says an interrupted detonation circuit 3 for drivers pre-tensioner. All the check screens show the system fully working, show correct responses from both pre-tensioners, show both latches working fine on the seatbelts, everything is 100% fine and working according to the system.
So just for now I wouldn't be sure the drivers seat is plug and play. It won't flag a visible code no, but possibly still some component isn't 100% correct and causes the SIM to be unhappy enough to log internal faults, despite generally the entire swap being 'technically' plug and play, the SIM won't be happy with something
Dave
I have the exact same seats but with heated elements. I want to be able to fit a pre-facelift m-sport seat sensor and box onto my facelift seat.
It looks quite straight forward, more so if the mat is the right one for the seat. The only thing I'm wondering is where do the heating elements go?
Are they floating between the sensor and the leather, or glued to the back of the leather, or worse still, glued over or *under* the occupancy sensor?
Any advice much appreciated.
PS, the seat leather goes baggy when they get get/damp, probably from bad storage in accident damaged cars at breakers. Mine were baggy but after a day in the car with the heaters on full blast and heated seats turned on they were fine.
Great thread by the way!
Two questions:
Has anyone else fitted these seats and plugged the sensor from a facelift occupancy sensor into their yellow multi-plug? Apart from the light on the dash they actually do work fully, sensing occupants when they are in the seat etc etc...
And,
Has anyone done this mod have INPA installed?
I still have a fault, but not one that brings up a warning light. It says an interrupted detonation circuit 3 for drivers pre-tensioner. All the check screens show the system fully working, show correct responses from both pre-tensioners, show both latches working fine on the seatbelts, everything is 100% fine and working according to the system.
So just for now I wouldn't be sure the drivers seat is plug and play. It won't flag a visible code no, but possibly still some component isn't 100% correct and causes the SIM to be unhappy enough to log internal faults, despite generally the entire swap being 'technically' plug and play, the SIM won't be happy with something
Dave
Nice write up! Will be a great resource for many.
A quick note about the metal rings ("hog rings", at least on this side). While it's obviously possible to remove and reuse using common hand tools, it is easier to simply cut them off with side cutters and install new rings using dedicated hog ring pliers. These are common connectors for all manner of upholstery and available from upholsterers supply or online.
A quick note about the metal rings ("hog rings", at least on this side). While it's obviously possible to remove and reuse using common hand tools, it is easier to simply cut them off with side cutters and install new rings using dedicated hog ring pliers. These are common connectors for all manner of upholstery and available from upholsterers supply or online.
Bump.
Has anyone had a post-facelift seat apart and seen where the heat-pad is vs the occupancy sensor?
I'm hoping it's just like Pawnsacrifice's seats, but the heating pads are stuck/bonded to the back of the leather cover, so I can just kinda work the same as he did.
Also does anyone have the part numbers for a pre-facelift box and the M-sport seat sensor?
I've got so far:
72 10 7 919 202 - pre-facelift M-sport sensor mat - £131.68 @ BMW Soper of Lincoln
65 77 6 927 500 - pre-facelift control electronics box - £55.39 @ BMW Soper of Lincoln
I'm semi-tempted on the control box to just get one from eBay since they're on loads of older BMWs.
Cheers for any help/advice
Dave
Has anyone had a post-facelift seat apart and seen where the heat-pad is vs the occupancy sensor?
I'm hoping it's just like Pawnsacrifice's seats, but the heating pads are stuck/bonded to the back of the leather cover, so I can just kinda work the same as he did.
Also does anyone have the part numbers for a pre-facelift box and the M-sport seat sensor?
I've got so far:
72 10 7 919 202 - pre-facelift M-sport sensor mat - £131.68 @ BMW Soper of Lincoln
65 77 6 927 500 - pre-facelift control electronics box - £55.39 @ BMW Soper of Lincoln
I'm semi-tempted on the control box to just get one from eBay since they're on loads of older BMWs.
Cheers for any help/advice
Dave
I think that some boxes can essentially say 'always occupied' and 'always clipped' on the seatbelt.
The only downside of that is that if a seatbelt isn't clipped properly you might not get a warning.
The really frustrating thing with this is that my seat sensor works absolutely fine.
In INPA it logs occupancy fine, SIM is responding with ready to trigger for airbags, yadda yadda. For all intents and purposes post-facelift works fine plugged directly into the pre-facelift loom.
The issue is the checksum on the sensor mat doesn't match what the SIM expects, so it flags an error.
That really isn't a big issue bar the new MOT check rules, and also that the light is illuminated and may be masking other issues.
Part of me also wonders if it's worth feeding a sensor mat with 12v and see what signal comes out. I assume it must be a digital stream on the facelift (box integrated in the mat), while pre-facelift the mat just gives a raw signal and the box makes it a digital signal.
I do wonder if there is a way to get the raw signal from the facelift sensor and take it to the pre-facelift box... assuming the raw signals from both is compatible of course. Hmmmm.
Yep, just easier to get the old mat retrofitted methinks
My thought is that a mat can be bought for £130, fitted, and then the one I take out is worth maybe £60 to sell to a post-facelift owner with a dodgy sensor.
The total cost for me is then a box for £25 off eBay and then about £60 for a new mat, and a few hours work to swap. Not bad considering it's all working as needed.
The 'cheaper' option is £25 for the box, and then £30 for a de-activator. I'd rather pay £30 more and have it right and do some decent write-up on the job for the forum
My biggest gripe with the entire thing really is that BMW are dicks for not fitting M-sport seats as standard. The worst bit about BMW is that there are too many options that are important but not standard.
The only downside of that is that if a seatbelt isn't clipped properly you might not get a warning.
The really frustrating thing with this is that my seat sensor works absolutely fine.
In INPA it logs occupancy fine, SIM is responding with ready to trigger for airbags, yadda yadda. For all intents and purposes post-facelift works fine plugged directly into the pre-facelift loom.
The issue is the checksum on the sensor mat doesn't match what the SIM expects, so it flags an error.
That really isn't a big issue bar the new MOT check rules, and also that the light is illuminated and may be masking other issues.
Part of me also wonders if it's worth feeding a sensor mat with 12v and see what signal comes out. I assume it must be a digital stream on the facelift (box integrated in the mat), while pre-facelift the mat just gives a raw signal and the box makes it a digital signal.
I do wonder if there is a way to get the raw signal from the facelift sensor and take it to the pre-facelift box... assuming the raw signals from both is compatible of course. Hmmmm.
Yep, just easier to get the old mat retrofitted methinks
My thought is that a mat can be bought for £130, fitted, and then the one I take out is worth maybe £60 to sell to a post-facelift owner with a dodgy sensor.
The total cost for me is then a box for £25 off eBay and then about £60 for a new mat, and a few hours work to swap. Not bad considering it's all working as needed.
The 'cheaper' option is £25 for the box, and then £30 for a de-activator. I'd rather pay £30 more and have it right and do some decent write-up on the job for the forum
My biggest gripe with the entire thing really is that BMW are dicks for not fitting M-sport seats as standard. The worst bit about BMW is that there are too many options that are important but not standard.
The full kit one, just to be clear, that doesn't replace the need for the generic occupancy interface box thingy under the seat does it?
Ie, for me with just facelift M-sport I'll be needing a used box for about £25, and also this kit for £39.
So £64.
Seems reasonable to just check I can get rid of this pesky light... then go for a full mat replacement later if I feel like some more pain and expense
Dave
Ie, for me with just facelift M-sport I'll be needing a used box for about £25, and also this kit for £39.
So £64.
Seems reasonable to just check I can get rid of this pesky light... then go for a full mat replacement later if I feel like some more pain and expense
Dave