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Key fob will not lock trunk

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Old Feb 9, 2020 | 03:16 PM
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2016 C300
Exclamation Key fob will not lock trunk

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Last edited by jkhjr; Apr 3, 2020 at 03:11 PM. Reason: misinformed
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Old Feb 9, 2020 | 03:47 PM
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2016 C300W4 (W205), Luxury Pkg, Diamond Silver Met. and Silk Beige\Espresso Interior
Are you sure it's not locking? If you have the fob anywhere near the car and hit the trunk release above the license plate, it will open like it was unlocked and the doors will remain locked.

Or does it still open when the fob is out of range from the vehicle also?
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Old Feb 9, 2020 | 07:27 PM
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You are right!! When key fob is out of range the trunk remains locked. I suppose that is the keyless-go feature. Glad that issue is resolved!!
Now, if I could just get the keyless-go feature to unlock the doors when I place my hands behind the handle. Also, if I could get the keyless-go feature to lock the doors when I press the indention on the outside of the handle.
My dealer did not see any fault codes. Any suggestions why the keyless-go feature will not unlock and lock the doors?
I appreciate your help soooo much!!!
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Old Feb 10, 2020 | 12:35 AM
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Do you have your Keyless Gp button in the ignition - and/or why did your dealer not test this for you to show you how this works ?
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Old Feb 10, 2020 | 11:07 AM
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Thanks for your reply. Yes, I have the keyless-go button in the ignition switch.
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Old Feb 10, 2020 | 01:15 PM
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Does it unlock just the drivers door?
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Old Feb 10, 2020 | 02:19 PM
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Hi Mike and thank you for your reply.
The key fob will lock and unlock all doors and the trunk.
The keyless-go feature will only unlock the trunk but will not lock or unlock any doors. This is my main concern now.
Dealer did not receive any fault codes for the keyless-go feature.
Do you know what the problem would be?
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Old Feb 10, 2020 | 05:27 PM
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Originally Posted by jkhjr
Hi Mike and thank you for your reply.
The key fob will lock and unlock all doors and the trunk.
The keyless-go feature will only unlock the trunk but will not lock or unlock any doors. This is my main concern now.
Dealer did not receive any fault codes for the keyless-go feature.
Do you know what the problem would be?
it’s possible you do not have that feature.

Do you have small squares on the outside of the handles, if not then you do not have keyless entry.
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Old Feb 10, 2020 | 07:26 PM
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Yes, I have the square indentions on the front of the handle.
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Old Feb 10, 2020 | 09:44 PM
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If my fob and iPhone are in the same pocket the keyless go acts up for me. I usually have to separate the two and reattempt.
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Old Feb 10, 2020 | 10:14 PM
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Thanks for your reply. I keep my phone and smart key in separate pockets also.
Keyless-go will not lock or un-lock my doors, however it works on the trunk. Dealer did not see any fault codes for the keyless-go. Strange electrical issue. Thanks again.
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Old Feb 10, 2020 | 11:16 PM
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Try double clicking the lock button on the fob, then double click the unlock button. The double click on the lock button disables Keyless-Go for that fob, but it should automatically re-enable at next usage. Maybe it's stuck in disabled mode?






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Old Feb 11, 2020 | 11:36 AM
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The dealer did that procedure last week, and I just did that this morning. No luck though. I can live without keyless-go, but it would be more convenient.
Also, would you know why driver's side window would have what I call a "squeak". Sounds if glass is rubbing against rubber seal. I can lower the window some and it does not make the"squeak", therefore I know it is the window. Applied some grease that auto parts store recommended to the channel that window follows, but did not help. Any suggestions?
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Old Feb 11, 2020 | 12:46 PM
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It may be the door seal that is squeaking, try putting rubber grease on both door seal rubbers.
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Old Feb 11, 2020 | 12:54 PM
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I am pretty sure it is the window. I can lower the window some, and no "squeak".

UPDATE: SOLVED

I added a strip of black weatherstripping (purchased from a hardware store) to the top of the door between the existing weatherstripping. That made the glass more snug, and no more "squeak".

Last edited by jkhjr; Mar 7, 2020 at 11:42 AM. Reason: solved
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Old Feb 11, 2020 | 01:09 PM
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When you lower the window it's possible the door frame moves just a fraction from the seal due to there being slightly less pressure on it.
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Old Feb 24, 2020 | 05:19 PM
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Mike, since my car is still under warranty I will take it back to dealer and let them try again. You mentioned door frame. I have read that adjusting the door frame could maybe help, and maybe help with the wind noise I hear. Of course, my wind noise is not nearly as bad as many people on this forum have. Also, I wonder is there some way I can adjust the door frame myself, before going back to dealer. Any suggestions? Thanks!!
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Old Feb 25, 2020 | 02:10 AM
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As it's under warranty I would let the dealer sort it.

That way anything goes wrong there is no cost to you.
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