Swapping seats from a. 2009 C63 AMG - Page 3 - Mercedes-Benz Forum
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post #21 of 45 (permalink) Old 08-21-2018, 06:56 PM Thread Starter
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One trick I learned with sing JB Weld to fashion "parts" is to use duct tape. Not the fabric "duck tape", but real metal duct tape. It can be molded into a shape ou need, filled with JB Weld, then peeled off when done.
Thanks for tip. I actually have some of the real duct tape laying around.

I had 30 minutes to work on the seat. I used my multimeter to check out the wiring on the plugs under the seats. I found that:

On the white 14-pin connector:
1. The White wire in pin 8 and the Black/Yellow wire in pin 9 have continuity. They appear to power the forward and backward motion of the seat.
2. The White/Black wire in pin 10 and the Blue/Black wire in pin 12 have continuity and appear to power the rear tilt of the seat bottom.
3. The White/Blue wire in pin 13 and the Black/Red wire in pin 14 have continuity and appear to power the front tilt of the seat bottom

On the black 6-pin connector:
The White wire in pin 2 and the Brown Wire in pin 6 have continuity. I cannot tell where they go, but Iím wondering whether they power the seat back tilt.

Tomorrow night Iím planning to use the power source I salvaged from a personal computer to apply 12-volt power to each of the circuits I identified and see if I can get the motors to move.
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post #22 of 45 (permalink) Old 08-22-2018, 06:13 PM Thread Starter
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I took my brief week night time allotment and confirmed the motor operation. Reversing polarity operated the motors in opposite directions.

I still need to determine how the seat bolster, and upper and lower lumbar supports are wired. There are 6 pins on the smaller black plug:
1. Blue
2. White
3. Black
4. Brown
5. Red
6. Violet

As mentioned above, the White and Brown wires control the seat back tilt. When I tested the other 4 with my multi meter, none of them form a circuit. I need to poke around in the seat some more to see whether there is another connector.
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post #23 of 45 (permalink) Old 08-22-2018, 06:59 PM
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Are the seat bolster and lumbar supports pneumatic? If so, then those circuits just open and close valves, so you'll need pneumatic pressure applied for them to function.

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post #24 of 45 (permalink) Old 08-22-2018, 07:23 PM Thread Starter
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Are the seat bolster and lumbar supports pneumatic? If so, then those circuits just open and close valves, so you'll need pneumatic pressure applied for them to function.
These guys:
https://mbworld.org/forums/c63-amg-w...echanical.html

Seem to think they are pneumatic. I am not sure whether the pump is in the seat or external.

If it is external could I use the air tube the controls the rear headrests to inflate them?

When I searched on lumbar support, there were several complaints about them failing. Seems like it could be a weak spot.
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post #25 of 45 (permalink) Old 08-23-2018, 07:14 AM
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I poked around in WIS and EPC and yes, the multi-contour seat function is pneumatic. There should be an air line in the seat itself that connects (via another air line) to the PSE pump. You cannot use the rear headrest release line in your car because that is operated by engine vacuum and the multi-contour seats require air pressure. If you want to use the multi-contour feature, you would need to retrofit the PSE pump in the trunk and run lines to the seat. The electrical wiring just connects to a valve block in the seat to open and close airflow.

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post #26 of 45 (permalink) Old 08-23-2018, 07:05 PM Thread Starter
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Thanks for your help. I found one tube that looked like it could be for a pneumatic device, but it looped in and out of the seat bottom. I couldn't find an external connection. Is it possible that the bolsters and lumbar supports are pneumatic and the pump is located in the seat?

After exploring the seat bottom, I removed the cover that holds the bolster and lumbar controls. There is a 10-pin plug that emerges from the seat back. It has these wires in it:
Yellow/White
Red
White
Grey/Green
Brown/White
Green/Black
Blue/Black
Blue/Brown

That connects to a wiring harness that connects to the switches. This has some wires of the same color and some different:

Tan/White
Red
Grey
Brown/White
White
White/Black
Brown/Blue
Green/Black

By the time that connector reaches the switches, it gains two additional red wires (for a total of three.) What I need to figure out is where does the wiring harness from that emerges from the seat back terminate in the seat bottom.* I assume I need to determine how to provide power and ground to it.
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post #27 of 45 (permalink) Old 08-23-2018, 08:16 PM
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No, I checked WIS and EPC and the pump is definitely trunk mounted. There are pneumatic lines that run from the PSE pump in the trunk to the seat.

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post #28 of 45 (permalink) Old 08-24-2018, 05:41 PM Thread Starter
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Any clue as to location of the attachment point on the seat? Iíve looked at both seats and it is so obvious.

I may need to go forward without the bolster and lumbar functions.
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post #29 of 45 (permalink) Old 08-24-2018, 07:50 PM
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The pneumatic hose should be fairly obvious. It looks like a hard plastic air hose. The connection is one of those snap-on things wit an o-ring inside.

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post #30 of 45 (permalink) Old 08-24-2018, 08:05 PM Thread Starter
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I found this on the bottom of the passenger seat, but it seems to be on a loop that ties in with the air bag wiring. I can’t trace it to the seat back. There is nothing like it on the driver’s seat.

I plan to put a post on the C63 forums and ask whether they know. I did not buy the seats directly from the owner of the C63, but I think the C63 owner and the guy who sold me the seats are friendly. He may be able to share some information.

Thanks again for your responses.
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