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DIY: Do It Yourself
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Old 10-04-2018, 02:06 PM   #181
Landlorder
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Join Date: Aug 2012
Location: London and Bristol
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My Ride: 330CI 6sp Vert
Year: 2003
Model: 330ci
Transmission: 6 speed & 3.38 LSD
Hi thanks for the reply, i've got a used button centre panel ordered with the heated seats buttons. I've been reading up on this a fair bit and it looks like some people don't need to run cabling from fuse box to centre panel.

The part number I put is for convertible only. It's called wiring heated seat. Part of wiring set seat diagrams on real oem. Hoping someone can confirm it is the one to get.

If not then sure i will run the 6 wires myself.
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Old 10-06-2018, 03:38 PM   #182
Landlorder
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Year: 2003
Model: 330ci
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Any idea on part numbers to connector pins needed?
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Old 10-06-2018, 10:00 PM   #183
Landlorder
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My Ride: 330CI 6sp Vert
Year: 2003
Model: 330ci
Transmission: 6 speed & 3.38 LSD
Just took off the driver seat cover. Never done that before. Was careful with the cable. Am getting bolster repaired before fitting seats to car.

Also dyed the passenger seat.
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Old 10-09-2018, 08:58 PM   #184
Landlorder
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My Ride: 330CI 6sp Vert
Year: 2003
Model: 330ci
Transmission: 6 speed & 3.38 LSD
Ok problem. My replacement heated passenger seat has an extra small yellow plug with 2 wires. I fitted the seat to the car (did not disconnect battery). Connected the large yellow plug fine. Left the unknown plug hanging. And I now have air bag light on.

My old seat did not have this extra plug.

What the hell?!

Some reading is showing it might be a passenger seat occupancy sensor plug!?!? Or that I might need to swap seat belt pretensioners? Any idea ?
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Old 10-13-2018, 02:33 PM   #185
Landlorder
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My Ride: 330CI 6sp Vert
Year: 2003
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Transmission: 6 speed & 3.38 LSD
That extra plug was for the seat belt pretensioner. All ok now. Waiting for driver side to be repaired with a panel from old passenger seat cover. Once done will fit and sort out wiring. Time to go through this thread again. Also dyed the passenger side - came out nice and Matt no glossy look.
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Old 10-21-2018, 10:39 PM   #186
Mless5
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Seems like later cars already have the wiring from the fuse box to the center panel.
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Old 11-03-2018, 05:37 PM   #187
Landlorder
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My Ride: 330CI 6sp Vert
Year: 2003
Model: 330ci
Transmission: 6 speed & 3.38 LSD
Yep mine already had the fuses there. Just waiting on plugs I managed to get a used 23pol plug with wires for heated seats and the plugs for under the seats with wires for 20. Also got driver seat cover on with repaired bolster panel. Fitted it today. Those hog rings are a pain. I didn't do them all on top half of backrest.
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Old 11-04-2018, 03:36 PM   #188
Landlorder
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Fitted them. That was so easy. Just 2 wires to each seat from switch panel. And extra ground for each seat. You really need to buy a used plug to make this easy to do. The pins come out easy from the connectors. So if you have a convertible with electric memory (driver) seats its very easy to retrofit heated seats. I am surprised at how quickly they warm up. Very pleased. This guide certainly helped.
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Last edited by Landlorder; 11-15-2018 at 07:32 PM.
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Old 01-04-2019, 07:43 PM   #189
nahramp330
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I just did this in my car as well, and I enjoy the new feel.
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Old 01-14-2019, 11:36 AM   #190
Landlorder
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Year: 2003
Model: 330ci
Transmission: 6 speed & 3.38 LSD
What did it cost you?. Now seems to be a great time to do this.

Quote:
Originally Posted by nahramp330 View Post
I just did this in my car as well, and I enjoy the new feel.
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Old 11-13-2019, 02:11 PM   #191
tobestool
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Well this seems to be the definitive place on the Internet for retrofitting heated seats - thanks especially to the OP and everyone who's contributed. About to embark on this to put them in my 330i touring in the UK. I'm off to get some used seats from my local breaker soon, but they don't match my interior and I'm not keen to lose my blackberry nappa seats (or hopeful of finding matching heated seats). To save me some experimenting can anyone answer the following, please?

Is it practical to take the heating elements out of one seat and put them in another (I'm patient and I've fitted an aftermarket heated seat kit before, but I'd rather keep the OEM switch this time).

Does the OEM switch work with the temperature sensor in the universal heating element kits available form ebay? I assume that the heating element will, even if the power's a bit lower.

Does anyone have part numbers, or just the names of the right contacts to crimp / solder new connectors onto the wires rather than splicing onto a cut off plug?

Thanks in advance!

Last edited by tobestool; 11-13-2019 at 02:34 PM.
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Old 11-13-2019, 03:14 PM   #192
325Turbo
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Quote:
Originally Posted by tobestool View Post
Is it practical to take the heating elements out of one seat and put them in another (I'm patient and I've fitted an aftermarket heated seat kit before, but I'd rather keep the OEM switch this time).
If you don't have matching color etc then this is the only alternative. I carefully cut off the elements from standard gray seats and got then sewed into my black leather seat covers. Local upholstery shop did good job.

Quote:
Originally Posted by tobestool View Post
Does the OEM switch work with the temperature sensor in the universal heating element kits available form ebay? I assume that the heating element will, even if the power's a bit lower.
Most likely not.
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Old 11-13-2019, 03:50 PM   #193
tobestool
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Quote:
I carefully cut off the elements from standard gray seats and got then sewed into my black leather seat covers. Local upholstery shop did good job.
Ah, great. Good to know someone has managed it before me.

Quote:
Quote:
Does the OEM switch work with the temperature sensor in the universal heating element kits available form ebay? I assume that the heating element will, even if the power's a bit lower.
Most likely not.
Hmm, fair enough; I can't say I was particularly hopeful. I'm pretty sure that the aftermarket kit in my other half's MX-5 (Miata) is the same as many of the ebay kits. I'll see if I can get any clues with a multimeter when I've got some genuine seats to compare it with.
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