Driver's seat up down: Help me diagnose this
Thread Starter
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Joined: Jul 2017
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2003 E320, 1999 CLK320
Driver's seat up down: Help me diagnose this
I have a problem with the driver's seat on my 2003 E320. The back part of the cushion does not go up an down.
Here are the symptoms:
No DTCs come up. It's communicating with the motor's hall sensor.
All other motors work.
The back part of the seat is stuck in the up position.
When I press the switch on the door for up. I hear a click.
When I press the switch on the door for down. I hear no click.
Any thoughts?
Here are the symptoms:
No DTCs come up. It's communicating with the motor's hall sensor.
All other motors work.
The back part of the seat is stuck in the up position.
When I press the switch on the door for up. I hear a click.
When I press the switch on the door for down. I hear no click.
Any thoughts?
MBWorld Fanatic!
Joined: May 2017
Posts: 2,290
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C320
One of the relays in the seat control module has failed. The easiest solution is to replace the seat control module located under the seat. You can pull the seat the get access to the module, read the PN printed on it and buy an identical PN on ebay.
Thread Starter
Newbie
Joined: Jul 2017
Posts: 6
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2003 E320, 1999 CLK320
Thanks for helping. I really appreciate it. Is there a possibility it could be the switch. If there's no current coming from it then it would be another reason why the relay didn't click.
MBWorld Fanatic!
Joined: May 2017
Posts: 2,290
Likes: 434
C320
One thing you can do when you have the seat unbolted from the floor is to hotwire the appropriate seat more to move it back down into a good drivibg position for you. All the seat motor functions are marked on the housing of the controller.
Thread Starter
Newbie
Joined: Jul 2017
Posts: 6
Likes: 0
2003 E320, 1999 CLK320
Not likely. The failure is usually in the controller. If you had a STAR diagnostic tool or Foxwell nt520 you could could actuate the seat through the scan tool. If it moves you'll know the failure is at the switch.
One thing you can do when you have the seat unbolted from the floor is to hotwire the appropriate seat more to move it back down into a good drivibg position for you. All the seat motor functions are marked on the housing of the controller.
One thing you can do when you have the seat unbolted from the floor is to hotwire the appropriate seat more to move it back down into a good drivibg position for you. All the seat motor functions are marked on the housing of the controller.
I have an iCarsoft MB II. I wonder if that could move the motor? I might try tomorrow to get the leads from the passenger seat and hotwire the motor on the driver's side to check its functioning.
BTW the symbols HH, HV, LV and LK, I assume are seat cushion up down, seat cushion angle, backrest recline and fore-aft respectively. Is that correct?
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