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A Quick Fix To Keyless Go Locking Issue

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Old Oct 26, 2025 | 02:46 AM
  #1  
BenzV12's Avatar
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A Quick Fix To Keyless Go Locking Issue

I recently had an issue and thought I have to share it with you . It would most likely would work on other cars having keyless go as well. Well, this is what happened :
I try to lock the left rear door by pressing the rectangular button on the door handle and nothing happens . I try again, same thing . Well, I open and close the left rear door and then touch the rectangular button on the door handle , it works .
If you also encounter a similar problem as mine, open & close the door and try to lock it with the button . Hopefully, it would work on your end as well
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Old Oct 26, 2025 | 01:46 PM
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W212 MY'14 M276-3.5NA @75kMi
unstable door modules

Originally Posted by BenzV12
I recently had an issue and thought I have to share it with you . It would most likely would work on other cars having keyless go as well. Well, this is what happened :
I try to lock the left rear door by pressing the rectangular button on the door handle and nothing happens . I try again, same thing . Well, I open and close the left rear door and then touch the rectangular button on the door handle , it works .
If you also encounter a similar problem as mine, open & close the door and try to lock it with the button . Hopefully, it would work on your end as well
This unresponsive door modules are the tip of an iceberg. It evidence the DCU/Keyless over CAN-B are hardly stable.

This is 100% what is responsible for drained batteries while parked.

CAN-B networking is made increasingly slower.

Experiment Rebooting the chassis to temporary restore normal functionality.
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Old Oct 26, 2025 | 01:47 PM
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Originally Posted by BenzV12
I recently had an issue and thought I have to share it with you . It would most likely would work on other cars having keyless go as well. Well, this is what happened :
I try to lock the left rear door by pressing the rectangular button on the door handle and nothing happens . I try again, same thing . Well, I open and close the left rear door and then touch the rectangular button on the door handle , it works .
If you also encounter a similar problem as mine, open & close the door and try to lock it with the button . Hopefully, it would work on your end as well
almost like open the door and triggering the door pin woke up a sleepy module and then reset the keyless touch mechanism
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Old Oct 26, 2025 | 08:22 PM
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Andre Cateb's Avatar
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W212 (212.065/276.820)
Resoldering the keyless go module was the solution to all my keyless go issues. The FOB battery now lasts 6~8 months and all detection areas are super sensitive.
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