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996 seat heating elements in 997 foldable seat

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Hi all,


Sometime back, I installed a pair of 997 foldable buckets in my 996TT. Whilst these are superb, I lost the heated seat function of the original Comfort seats. As the car has this option (M342), all the wiring and control units are there, I thought I could add the heating elements into the 997 buckets, reusing the wiring, switches, etc.


Did anybody try something like this?I have identified, with the help of rosepassion.com, the heating elements, as per PET for MY02 996TT with M342, i.e., left/right heated seats.


I'm intrigued with the fact that for the bottom cushion, there seem to be 2 elements, one below the cushion and another on top of it, integrated with the cushion. In the 2017 PET, sheet 817-05, these are items 8 (996 521 531 01), 9 (996 521 525 00) and 16 (996 653 105 01) as per the photos attached. I don't feel like tearing my original Comfort seats to find out the details and am wondering if anybody had experience with repairing their seat elements and can confirm whether all 3 elements are used and are installed like it seems from the PET illustration:


- Item 8 installed between the backrest cushion and the leather cover;

- Item 9 against the leather as well;

- Item 16, beneath item 9.


As to plugs, do all 3 elements plug directly into the sockets of the wiring harness underneath the seat? From the photos, the cables seem to be long enough for that purpose.


 996 653 105 01.jpg

996 521 525 00.jpg

996 521 531 01.jpg

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Well, after my own digging, I found that the seat bottom cushion does not have a heater integrated, although it looks like it does in the photo above and also in the parts catalog: the illustration shows it with a lead and a plug dangling.


So, to go ahead I just need the two mats, the two cable bundles from my original seats and the two control units and most importantly, find a way to fit the mats into the seat cushions which may not work, given they are segmented. Am investigating that.

Edited by laalves
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  • 1 year later...
22 minutes ago, Landscraper said:

Curious to know how this went for you? I will be swapping over my heating elements to a new set of seats shortly and want to make sure i've got everything I need.


Actually, haven't got'round doing this yet.

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  • 3 months later...
  • 2 months later...
  • 4 weeks later...

Ok well going to be taking apart my 996 sport seats for a replacement of top leather.


From what I have read both the 996 and 997 use a similar element heater type. The differentiation is in the controls and complexity of the switching.


I had added aftermarket heater elements to seats in the past. Going with whatever switching that comes with the aftermarket elements seems to be the way to go.

Edited by 987_RDC
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