E-Class (W212) 2010 - 2016: E 350, E 550

Help! I can't get the grey lock to slide down (Pics)

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Old 06-06-2023, 01:55 PM
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2012 E550 Sedan
Help! I can't get the grey lock to slide down (Pics)

I can't get one of the wire harness connectors to slide down and lock into place. (See pic)

On 3 of the other ones I looked at they all slid down easily, but this one won't. (It's the grey plastic piece in the picture).

I'm trying to push the grey plastic piece down to lock into place, but it won't budge. It's stuck.

Does anyone have any tricks on how to get it to slide down and lock into place? Thanks


Old 06-06-2023, 02:49 PM
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The top part of the grey plastic broke off while I was trying to push it down. Great.

I'm guessing there's no way to replace it without reconnecting all the wires to a new connector.
Old 06-06-2023, 03:54 PM
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 Sport (W212 @96K), 2015 ML350 (W166 @92K)
You can buy the new connector, and carefully remove the gray part using a small "jewelry/eyeglass" screwdriver. I know it works

Summary: no need to create more problems moving wires from one connector to another.

Here is a thread about that connector, https://mbworld.org/forums/e-class-w...ml#post8385341

Last edited by juanmor40; 06-06-2023 at 03:57 PM.
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Old 06-06-2023, 06:34 PM
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Originally Posted by jumpman726
I can't get one of the wire harness connectors to slide down and lock into place. (See pic)

On 3 of the other ones I looked at they all slid down easily, but this one won't. (It's the grey plastic piece in the picture).

I'm trying to push the grey plastic piece down to lock into place, but it won't budge. It's stuck.

Does anyone have any tricks on how to get it to slide down and lock into place? Thanks

For me it looks the grey connector is NOT the right one for this black connector. The pegs in the grey piece do not line up with the slots in the black connector half.
Old 06-06-2023, 06:56 PM
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 Sport (W212 @96K), 2015 ML350 (W166 @92K)



Arrie, those two are the stops when the connector is finally closed/secured. If I recall correctly, if the grey tab is pull too far something inside gets out of position, and it must be carefully put back in place; otherwise, pushing too hard breaks it.

The first time I changed spark plugs I pull one of them too much, and I mistakenly forced it in when I finished and broke it as well. Now I am bit more careful since those are the same safety latches on the camshaft connectors.

Last edited by juanmor40; 06-06-2023 at 07:08 PM.
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Old 06-07-2023, 11:00 PM
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2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
The best method I tried to be safe on these connectors is one hand ( right hand fingers for me ) push down grey* clip ( *after it reverse out 3 mm ) to allow the true black latch to lift up aka un-lock,
but removing the connector is not by pulling it, but by pushing it from the bottom upwards using my left hand fingers.
Yes a 2 hand job but its worth preventing this baby connectors from damage.

I got a few test connectors MALE and FEMALE, so I can practice with them on my working table with ease and the method I mentioned is so far the best I tried.


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