Driver's seat controls problem - Please, help to diagnose (2004 E320)
 

I have my driver's seat controls working only partially on my E320 (W211 - 2004 E320 with dynamic/vented seats option). The back rest works only one way (reclining) and the head rest does not move at all. The seat still moves back/ forward/up and down.

Can anyone suggest a good way of diagnosing whether it is the control module that is failing? Which control module would this be? I understand there are two of them one under the seat and another one behind the door panel.

Any help greatly appreciated.

I had a mechanic checking the seat controls last night. He was not able to identify what the problem was. The only thing he did was what I specifically asked him not to do - that is while testing it, he moved the back rest back a little more!....
I am running out of pillows to put behind my back to be able to drive my car ;)

Is there by any chance a way to manually adjust the back rest back up before I am able to sort this out?

Thanks

Quick update: the problem fixed.
I have purchased the 2004 Mercedes Benz E320 W211 Left front seat module P# A2118201185.

The replacement of the unit (it is the one located under the seat) took about 10 minutes.

The seat controls are back to normal. Thanks

I am going to replace mine over the weekend. I tried the switch first - it did not fix the problem. I have ordered a control module and it is coming today. Any advice on how to do the job, in the ten minutes it took you sounds great, would be appreciated! 2004 E500 Wagon

So how much does a seat module cost?

I have a similar problem on my CLK W208 the seat goes forward only but try using the pre programmed buttons 1,2,0r 3 if these work you are in good shape , mine still work normal .Good luck

MY05 e320cdi left seat: 2118201185, 2118208585, 2118700526, 2118704926, 2118709926, 2118704085, or 2118704785. Quick search:
http://www.ebay.com/itm/03-06-MERCEDES-E320-E55-E500-LEFT-FRONT-SEAT-CONTROL-MODULE-2118208585-OEM-/171659402660?pt=Motors_Car_Truck_Parts_Accessories&hash=item27f7b29da4&vxp=mtrhttp://www.ebay.com/itm/2005-2006-Mercedes-Benz-W211-W203-C230-Left-Seat-Control-Module-2118700526-/261451334364?pt=Motors_Car_Truck_Parts_Accessories&hash=item3cdfb6c2dc&vxp=mtr