W203 - Memory seats retrofit

Jim3880

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Mar 7, 2020
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6
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Sussex
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W203 C320 CDI
Hi guys I’m looking for any advice on retrofitting front memory seats into my 2006 W203 C320 CDI.

Currently I have heated + power seats, with only the manual adjustment for physically moving the seat forward and backwards.

I recently purchased a full set of C55 amg interior (including door cards with switches mounted on them) which is in great condition. This interior has the memory facility and additional motors to move the seats forward and backwards.

What I would like to find out is if my current door control modules will be the same as for the memory seats? (I didn’t get the door modules with the seats) Is it possible that my modules just need recoding? (The under seat modules for the C55 seats were included).

I assume that I may need a new wiring loom to accommodate the memory seats. Sadly I didn’t get this from the C55.
Does anyone have any part numbers for the loom(s) I may require?

Any advice or comments would be most welcomed!

Thanks in advance,

Jim
 

Petrol Pete

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Hi guys I’m looking for any advice on retrofitting front memory seats into my 2006 W203 C320 CDI.

Currently I have heated + power seats, with only the manual adjustment for physically moving the seat forward and backwards.

I recently purchased a full set of C55 amg interior (including door cards with switches mounted on them) which is in great condition. This interior has the memory facility and additional motors to move the seats forward and backwards.

What I would like to find out is if my current door control modules will be the same as for the memory seats? (I didn’t get the door modules with the seats) Is it possible that my modules just need recoding? (The under seat modules for the C55 seats were included).

I assume that I may need a new wiring loom to accommodate the memory seats. Sadly I didn’t get this from the C55.
Does anyone have any part numbers for the loom(s) I may require?

Any advice or comments would be most welcomed!

Thanks in advance,

Jim
Hi can't help you on the seat fitting but may I ask where you purchased the C55 stuff from ? I might ned a few parts. :thumb: You can PM me if preferred
 

Hectors Dad

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Joined
Oct 10, 2016
Messages
111
Car
E220
Hi guys I’m looking for any advice on retrofitting front memory seats into my 2006 W203 C320 CDI.

Currently I have heated + power seats, with only the manual adjustment for physically moving the seat forward and backwards.

I recently purchased a full set of C55 amg interior (including door cards with switches mounted on them) which is in great condition. This interior has the memory facility and additional motors to move the seats forward and backwards.

What I would like to find out is if my current door control modules will be the same as for the memory seats? (I didn’t get the door modules with the seats) Is it possible that my modules just need recoding? (The under seat modules for the C55 seats were included).

I assume that I may need a new wiring loom to accommodate the memory seats. Sadly I didn’t get this from the C55.
Does anyone have any part numbers for the loom(s) I may require?

Any advice or comments would be most welcomed!

Thanks in advance,

Jim
Jim,
I did this retrofit on my facelift 2015 S212 and it took a while as I went the whole 9 yards and did electric steering column and full 275 memory package.
If you just want full electrics without memory then it actually consists of 2 CAN wires (if the W203 has CAN?) on each seat, maybe an updates door control module and a swap of feeds in the rear SAM.
All of this is taken from my S212 so may be different for the W203 but it's a starting point.
 
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OP
Jim3880

Jim3880

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Joined
Mar 7, 2020
Messages
6
Location
Sussex
Car
W203 C320 CDI
Thanks for your reply. One of my friends recently purchased a w203 with memory seats and I managed to get some photos of the underneath of his seats. It appears he has an additional plug on his wiring loom which goes to each seat, which I do not have on my current factory seats. This must be for the memory / door control switches.
I’m not sure if cars which factory fitted memory seats have a different loom which goes from the door control module to the CAN. If so, this will be too much of a job for me I feel (both fitting and working out the loom part numbers required)
I may just have to swap the C55 cushions onto my current seat frames. I will carry on looking into it and post on here with the outcome!
 

zipdip

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Yes I think like others before you have found that the looms are different,quiet why car makers do this is crazy,just how much time and money is lost by not having the looms for one or two different builds,when if they paid maybe a very small amount to have one loom fits all,there would be large cost savings,
 

DSM10000

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Yes I think like others before you have found that the looms are different,quiet why car makers do this is crazy,just how much time and money is lost by not having the looms for one or two different builds,when if they paid maybe a very small amount to have one loom fits all,there would be large cost savings,
If there were such cost savings then manufacturers would do so, the fact that they generally do not is surely an indicator that it is not?
 

zipdip

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Well the vast amount of looms are made in the far east,South Korea is a big maker of them,the cost of two extra wires and two plugs is minute,and set against the fact that people who order cars with say a heated steering wheel or rear massage seats,find that there orders are delayed because the makers of the looms do the big orders first,and the little orders cost more as they have to spend time setting up for them,but hey many think that car makers like it that way because as the op has found out it is not so easy to add extras to the car he has.
 

richard

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As someone who talks to a rather large amount of people about retrofits, many are surprised to find that there is no spare wiring, or that when you have COMAND or Digital Cockpit additional fans are needed etc.

My answers are always as follows:
a) Saving $1 per car on a million cars adds up pretty quickly
b) Mercedes would not waste $$ adding a cooling system for your Digital Cockpit / COMAND if they could avoid it. Without it things will break within the 3 year warranty period or they really wouldn't have bothered to put it in

And if they really want a chat about it, then theres a whole bunch of things that get wired differently depending what options are in the car. The MOST fibre optic network that goes to each device (and the fibre is actually quite expensive), and the FlexRay data network that goes around the parking system and all the driver aids on the newest cars.

R
 

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