Swapping seats from a. 2009 C63 AMG - Mercedes-Benz Forum
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post #1 of 45 (permalink) Old 07-29-2018, 07:54 AM Thread Starter
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Swapping seats from a. 2009 C63 AMG

I will be meeting with a guy who is parting out a 2005 C230 some time this week. I need to replace the front wheel liners and I will also be looking to see if he has any trim that can upgrade some of my cosmetically challenged parts.

The seller told me that he had already sold the front seats to a guy who was replacing the seats in his 2009 C63 AMG. He has the 2009 seats available and asked if I was interested. Does anyone have any idea if this swap is possible? The seller states that the bolt patterns are the same, but I doubt the electronics are “plug and play.”

I upgraded the seats in my 2000 Porsche Boxster with some from a later car. But, the Mercedes electrical system seems more comlex and unless someone has a good step-by-step guide for adapting the seat controls, this seems like it may be a bit too challenging for me. The seats have some minor cosmetic flaws, but I think they would be a nice upgrade. I think the bolstering was a little too agressive for the previous owner’s comfort, but I generally prefer that type of seat. I have attached a few pictures.
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post #2 of 45 (permalink) Old 08-01-2018, 06:03 PM Thread Starter
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I went to see the seats in person. The seats would need a good clean and some minor leather repair. I have attached photos of the seat bottoms showing the electrical connections. Can anyone suggest a source for an electrical diagram that would help me start to sort out the power and controls?
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post #3 of 45 (permalink) Old 08-06-2018, 08:58 PM Thread Starter
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The seller reduced his price to $300 for both seats. I decided to take the risk that I could make them work in my car.
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post #4 of 45 (permalink) Old 08-07-2018, 06:40 AM
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post #5 of 45 (permalink) Old 08-07-2018, 09:05 PM Thread Starter
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I don’t think they will be. I expect to have some trial and error. If I can’t make them work I’ll sell them to someone else.

Thanks for your interest.
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post #6 of 45 (permalink) Old 08-11-2018, 08:49 AM Thread Starter
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I collected the seats last night, and I'm starting the R&D process

I have the seats and in my opinion they are going to add some character to the interior of my C230.

They are also going to provide me an incentive to watch my weight. The previous owner of the seats swapped them for a pair of stock C230 seats. According to the person I bought them from, the previous owner found them uncomfortable. I think that if I put on 15 pounds I might reach the same conclusion. The C63 seats are "aggressively" bolstered.

There are five issues that I need to address before I can be sure of a successful installation. Please feel free to offer suggestions and critiques as I puzzle this out.

1. Physical installation - Since the previous owner swapped a set of C230 seats into his car, I don't think this will be a problem. The seat rails and seat mounting hardware appear identical. I'm going to measure carefully to confirm this before I invest time and money on any of the other areas.

2. Cosmetic repair - There is wear on the driver's seat bolster, and small holes in the driver's headrest and passenger seat back. I'm considering three options for repairing these flaws: (a) Home repair kit; (b) A mobile service such as Fiber Renew; or (c) Taking the seats to an upholstery shop for professional repair. Option c will obviously be the most expensive, and option a will be the least expensive. I've attached pictures of the damaged areas in the event that anyone can share experience using home repair on this type of damage.

3. Air Bag System - According to this article: https://mbworld.org/forums/c-class-w...-any-w204.html the passenger seat air bag detection system in the C63 seats works differently from a stock W204 seat. I believe the W203 seats are similar to the the stock W204 seats. There are a few options for addressing this article provides some guidance on solutions: You are being redirected... The best option appears to be installing a seat mat with occupancy sensor from a W203 so that the air bag system will operate exactly as designed. I will also need to deactivate the side impact air bags in the C63 seats.

4. Wiring the power seat mechanism - I have the two-way power seats in my car. The power operates only the back-rest tilt and seat height. The C63 seats are full power with memory. It appears that I have two options. (a) Basic operation - This would by-pass the memory function and use stock W204 switches and connectors to operate the seat motors. I found this video on YouTube that provides some insight:
I posted on the W204 forum and asked if anyone was parting out a W204 and willing to part with the seat wiring and switches. (b) Full memory operation - This would enable 100% operation of the seats including the memory function. I was able to do this on my Porsche Boxster, but it was fairly complicated. I think I will need the door panels from a W203 with memory seats and the switches, wiring and connectors to make this work. That will add significantly to the expense, uncertainty and complexity of the project especially if the system works on the CANBUS. So, unless someone has done this before and can provide step-by-step instructions, I don't think I will spend much time on this option.

5. Seat heaters - Both my current seats and the C63 seats are heated. This looks like it will be "plug and play." I'll need to confirm that when I am measuring the seat rails.
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post #7 of 45 (permalink) Old 08-11-2018, 09:03 AM Thread Starter
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A few more photos

Here are some additional photos of the seats
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post #8 of 45 (permalink) Old 08-12-2018, 08:31 PM Thread Starter
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I had about an hour to study the wiring today. I focused on two of the connectors coming out of the controller box.

The large white connector has space for 14 pins. On the both the passenger side and the driver's side 12 are used.

The pin assignments are:
----------Driver-----------------Passenger
1------- Red-------------------Red
2. ------Red/Yellow---------Red/Yellow
3.-------Violet----------------Violet
4.-------Brown---------------Brown
5.-------Brown/Yellow-----Brown/Yellow
6.-------Brown/Green-----Brown/Green
7--------Not Used----------Not Used
8.-------White---------------White
9.-------Black/Yellow------Black/Yellow
10------White/Black-------White/Black
11.------Not Used----------Not Used
12.------Blue/Black--------Blue/Black
13.------White/Blue--------White/Blue
14.-------Black/Red--------Black/Red

The smaller (6 pin) black connector has these pin assignments:

---Driver------- Passenger
1. Blue---------Blue
2. White--------White
3. Black--------Black
4. Brown-------Brown
5. Red----------Red
6. Violet--------Violet

I can also see two of the seat motors in each seat. (I think I can see the motors for the forward/aft seat movement and the seat tilt. There should be a third motor in the seat back that controls the seat back angle.)

On the passenger side, the forward/aft seat motor has four wires - A thicker White wire and three thinner ones that are Brown/Green, Yellow/Black and Violet. The forward/aft adjustment motor on the driver's side only has three wires - A thicker White wire and two thinner wires that are Brown/Green and Violet. I think that the additional wire on the passenger side is related to the passenger airbag system. The passenger side has a module marked "Occupant Classification Module" that is not present on the driver's side. I'm wondering whether the additional wire does something to position the seat when the air bag system senses that a crash is imminent.

As my next step I'm considering the purchase of some used W204 seat controllers. They are about $40 from recyclers. This will allow me to set up some tests using a 12-volt power source to see if I can assign a function to each wire. (I will use lower voltage for the thinner wires on the assumption that they trigger relays in the various motors.) Right now, I'm thinking that the wires attached to the large white connectors control the three seat motors and the wires connected to the smaller black connector are for the seat bolsters.

I am almost certain that the blue/brown wires are for the seat heaters.
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post #9 of 45 (permalink) Old 08-15-2018, 07:51 PM Thread Starter
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More parts

I managed to find a couple of seat control switches with a connector and a small part of the wiring harness attached. This will give me something to which to solder when I construct the harness I need. I have attached pictures of the passenger switch the seller provided. I hope to receive the parts by Saturday so I can experiment this weekend.
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post #10 of 45 (permalink) Old 08-18-2018, 04:25 PM Thread Starter
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Driver's Side Switch Arrived

I received the driver's side switch today.* I was able to obtain one that had the connector and some of the wiring that interfaced with the seat motors.* There are 12 pins and all of them are occupied.

1. Black/yellow
2. White/blue
3. White/black
4. Black/blue
5. Black/yellow
6. White/green
7. Brown
8. Red/Black
9. White
10. Black/Grey
11. Black/yellow
12. Brown

The seat moves in the following directions

1. Forward
2. Back
3. Bottom cushion front up
4. Bottom cushion front down
5. Bottom cushion rear up
6. Bottom cushion rear down
7. Back rest backward
8. Backrest forward

I'm assuming that the striped wires are the control wires while the solid brown and solid white are power.* I think there may be two brown wires because one is the ground to the car and the other is the ground to the seat motors.
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