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Driver's seat stuck

Tiny
IMAGING
  • MEMBER
  • 2010 MERCEDES BENZ C350
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
The drivers seat is stuck. Doesn't move forward or backwards, up, down, nothing. What could be the problem?
Here is the VIN: WDDHF8HB7AA138562
Friday, September 17th, 2021 AT 1:48 PM

17 Replies

Tiny
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  • MECHANIC
  • 6,383 POSTS
Hello,

You could have a bad motor, switch or relay.
First check the relay. It is located in the trunk in side the right hand side panel (see pictures below).

Inspect the relay for any corrosion or burn pin(s).
You can also test the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relay is good then you will have to check to see if you are getting power to the switch and check the motor. But start with the relay.

Let me know what you find.
Thank you.
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Friday, September 17th, 2021 AT 6:42 PM
Tiny
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Where is the motor so I can check everything at once in case the relay is all good.
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Friday, September 17th, 2021 AT 9:55 PM
Tiny
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This car has motor control module as few motors for the seat.
I have attached the location for each of those.
Let me know if you have any questions.
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Saturday, September 18th, 2021 AT 10:57 AM
Tiny
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So you are telling me that each function in the driver's seat has a motor. So maybe up to 10 motors per chair?
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Saturday, September 18th, 2021 AT 1:08 PM
Tiny
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Is there one relay for the seat functions of the car or are there multiple relays? Also, are there multiple motors or just one main motors?
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Saturday, September 18th, 2021 AT 1:15 PM
Tiny
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There are 4 motors for the driver seat. I have attached the pictures for each ones location.
Since none are functional it is likely the relay.
The relay is located in the trunk (see picture below).
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Saturday, September 18th, 2021 AT 1:24 PM
Tiny
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The fuse was checked and has power, replaced the relay and still nothing. What else could it be if not the 4 motors like you said. The last resort will be to check the motors for power. What do you think is the best solution?
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Monday, September 20th, 2021 AT 10:51 AM
Tiny
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Check the switch to see if it is getting power.
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Monday, September 20th, 2021 AT 11:05 AM
Tiny
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Now for argument sakes, if there is power in the switch, what could it be?
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Monday, September 20th, 2021 AT 11:09 AM
Tiny
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Then the next item to check would be the control module for the motors. They are located inside the seat as well. If you look at one of the answer to the top that has the motor locations also have module location.
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Monday, September 20th, 2021 AT 11:47 AM
Tiny
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Which one if the pics you sent shows the control module?
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Monday, September 20th, 2021 AT 1:13 PM
Tiny
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See below please.
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Monday, September 20th, 2021 AT 1:15 PM
Tiny
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So just replace the control module? How can you test it to see if it's working?
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Monday, September 20th, 2021 AT 1:42 PM
Tiny
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Is there a way to move the seat up manually?
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Monday, September 20th, 2021 AT 1:46 PM
Tiny
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Not sure about moving it manually, unless of course you take apart the rail and adjust it as necessary. Let me do some checking on that.
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Monday, September 20th, 2021 AT 2:57 PM
Tiny
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So with the control module, just replace it with a new one?
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Monday, September 20th, 2021 AT 4:26 PM
Tiny
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Well, for every electrical components there are tests that can be performed to verify if it is bad. Typically done by checking internal resistance. However Mercedes does not have those information available for us to use.
So if the issue is something else like a wiring issue then this won't fix the problem.
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Tuesday, September 21st, 2021 AT 5:47 PM

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