Retrofit heated seats W203 part numbers

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charliehoward

New Member
Joined
Apr 17, 2023
Messages
7
Location
Hampshire, UK
Car
2003 C220D
Hi, I've just picked up a 2003 C220D but would like to retrofit heated seats, I've seen a few posts but not actually seen the part number for the loom I need. I know I will need seats if mine doesn't already have the pads in, which it looks like it should but I don't know, the controls and the loom. I've ordered the controls but can't find a number for the loom. Could someone let me know, thanks.
 
Welcome.

As far as I know, the loom is not available on it own. When I had the heated seats refitted to my W204, I was told that the factory-fitted heated seats are powered from the main loom, and what the retrofitters do is fabricate a small new loom just for the heated seats (instead of replacing the entire main loom with ones that also has the wires for the heated seats incorporated into it). I believe it's the same for the W203.

BTW, on the W204, the original retrofit also required SCN coding via STAR, however I am not sure if this is required for your car which will be older and possibly pre-dates SCN coding.
 
As far as I know, the loom is not available on it own. When I had the heated seats refitted to my W204, I was told that the factory-fitted heated seats are powered from the main loom, and what the retrofitters do is fabricate a small new loom just for the heated seats (instead of replacing the entire main loom with ones that also has the wires for the heated seats incorporated into it). I believe it's the same for the W203.
Hmm all the posts I've seen say it's a separate loom but never provide a part number, I may be wrong. If I am does anyone have instructions on the plugs needed and where to wire?
 
Also, when you say "I know I will need seats if mine doesn't already have the pads in, which it looks like it should but I don't know", are the seats original? If so, then they won't have the pads. The pads themselves can be retrofitted to the existing seats, BTW (though you can obviously choose to replace the entire seat anyway).
 
Hmm all the posts I've seen say it's a separate loom but never provide a part number, I may be wrong. If I am does anyone have instructions on the plugs needed and where to wire?

I was told that it's a separate loom when retrofitting, but part of the main loom when it comes from the factory - but I can't verify this information (and also, my car is the newer W204). I can't help with wiring diagram unfortunately, because as I said the loom was fabricated by the people who retrofitted this option to my car - someone else might know.
 
The loom for pre facelift cars was available at least till last year as I managed to source one. Part number is A 203 540 30 05 98 if you wish to try currently.
 
I recently retro fitted heated seats to my step mother's c class coupe,purchased from ebay as a complete kit,less than £50,carbon fibre heating mats,loom and two stage switch which was mounted discretely, took around two hours per chair and works a treat.
 
I recently retro fitted heated seats to my step mother's c class coupe,purchased from ebay as a complete kit,less than £50,carbon fibre heating mats,loom and two stage switch which was mounted discretely, took around two hours per chair and works a treat.
I know that's an option but personally I prefer retrofitting the factory setup if possible which I know it is
 
Hi Charlie and welcome . You must really , really ...really . Want those heated seats . What is prompting you to carry out this modification on such an old car ? (note : my own S203 is only 3 years 'younger' than yours , it has heated leather , that I rarely use. :) ) .

It seems like a lot of work for little gain ? How is the rest of the car , corrosion/rust wise ?. I believe the later ones (like mine) are more susceptible to rust . Is the rust sorted/non existent on yours. ?
 
Hi Charlie and welcome . You must really , really ...really . Want those heated seats . What is prompting you to carry out this modification on such an old car ? (note : my own S203 is only 3 years 'younger' than yours , it has heated leather , that I rarely use. :) ) .

It seems like a lot of work for little gain ? How is the rest of the car , corrosion/rust wise ?. I believe the later ones (like mine) are more susceptible to rust . Is the rust sorted/non existent on yours. ?
Age and cost of a car don't bother me, originally bought it as a temporary daily as my partner's new car failed within a week but it's quite nice so I wanna add the stuff that's missing. It's not much work really, done it to other cars before and I have my fun car so I can use that while I do it.
No rust that I can could see, so either it's been done or it's been looked after which I think it has, loads of invoices, the interior is immaculate for 120k
 
Could anyone recommend a good heated seat pad? I've seen people mention DK, not sure if they're still around as I can't find them?
 
Well done for finding one without any rust at that age and mileage (PS anyone mentions " all MB's were galvanised from the year 19XX" to you , just ignore them)

This is the favourite place on 203's , starts as a few small spots , ends like this ..if allowed to.

wheel arch rust c class.jpg
 

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