M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Front Passenger door lock no longer works. Must lock/unlock manually.

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Old Oct 22, 2020 | 08:22 AM
  #1  
kino1161's Avatar
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From: Virginia
2008 ML350 4Matic
Front Passenger door lock no longer works. Must lock/unlock manually.

My 08 ML350 front passenger door lock no longer works with the fob or lock/unlock button. It has to be manually locked and unlocked. Has anyone found a fix for this? Trying to avoid going to MB dealer. Thanks, all!
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Old Oct 22, 2020 | 06:59 PM
  #2  
expl0rer's Avatar
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Joined: Nov 2019
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From: Yeast Coast, Canada
GL550 X164
Originally Posted by kino1161
My 08 ML350 front passenger door lock no longer works with the fob or lock/unlock button. It has to be manually locked and unlocked. Has anyone found a fix for this? Trying to avoid going to MB dealer. Thanks, all!
Do you have a scanner? Codes will help with diagnostics. I have a GL with a similar problem. I can't lock or unlock using the button or handle, but the fob locks and unlocks it. What about using any of the other doors? Can you lock or unlock it that way? I have Keyless Go, as reference so I only have to touch the handle to unlock. Do you have Keyless Go as well or no?
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Old Oct 26, 2020 | 09:48 AM
  #3  
kino1161's Avatar
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From: Virginia
2008 ML350 4Matic
Yes I have a scanner. All other doors work properly, but the passenger door has to be locked/unlocked manually. I do not have keyless go.
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Old Oct 26, 2020 | 12:02 PM
  #4  
Maj. Dundee's Avatar
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Originally Posted by kino1161
Yes I have a scanner. All other doors work properly, but the passenger door has to be locked/unlocked manually. I do not have keyless go.
Well, did you check for code/s in the Door section?
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Old Oct 27, 2020 | 09:13 AM
  #5  
CaliforniaOldvo's Avatar
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2010 ML350 BlueTec
Check the various repair kits on Ebay.
The springs gets weak and you can replace the spring in the actuator.

" For 06-11 Mercedes M-Class ML Door Lock Actuator Repair Kit W164 4 Springs US"
On ebay and you tube.
It is a bit of work or buy try another lock actuator.
Check the parts catalog both lkefts and both rights are the same part number.

The plastic door switch button broke. Bought a new after market botton, swapped the plastic
button with nibs intact. 30 second repair.
Driving a 10 year car is an adventure.

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