Trunk keeps opening by itself?!?!

Old Feb 12, 2016 | 07:18 PM
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Question Trunk keeps opening by itself?!?!

WTF? 2012 CLS550: Every time I go out in the garage the trunk is open. Closes fine. Come out later and it's open.
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Old Feb 12, 2016 | 10:36 PM
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Same thing was happening to my wife's car, came to find out that the trunk button was getting pushed while key was in her pocketbook..haha!
Have you checked your pocketbook? Haha!
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Old Feb 12, 2016 | 11:49 PM
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Well, it IS my wife's car, but that doesn't seem to be the problem. As I stood there, I heasrd the trunk latch recycling occasionally with no input, so something was stuck (computers). The lock button on the truck wasn't working, so hit it twice and it confused itself and moved 1/2 way, then hit it once and it worked correctly, and the whole car locked. I'll see if it's open again in the morning. Made a service appointment just in case.
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Old Feb 13, 2016 | 02:01 PM
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It was open again this morning. No one touched a key. Glitch in program probably, needs a reset?
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Old Feb 13, 2016 | 02:51 PM
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I had the same problem with a new 2015 E-Class. I was prepared for multiple trips to the dealer as they "tried" and failed to replicate the problem. I was favorably surprised. I mentioned the issue to my service advisor and he said that they have had one other car with the same problem, and that car had a defective rear SAM. They replaced the rear SAM in my car and it has been fine since.
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Old Feb 13, 2016 | 02:54 PM
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Thank you so much. I'll ask specifically about that.
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Old Mar 13, 2016 | 10:54 AM
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Apparently it was ghosts. Hasn't happened since and the dealer couldn't find a fault code or any operational issue. I hate gremlins.
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Old Mar 13, 2016 | 02:06 PM
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The problem with ghosts is that when they get bored, they come back.


My dealer "pre-emptively" replaced the rear SAM - meaning that there were no codes shown or pending. They just relied on their experience of having that be the solution for another customer. That's just showing that they are willing to go out on a limb for customers, I guess.


My gremlins haven't been back, either. So, who knows?
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Old Apr 11, 2016 | 12:59 AM
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Update. Dealer couldn't find it. And, of course, it immediately quit. Probably waiting for warranty to expire.
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Old Apr 11, 2016 | 11:09 AM
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lol... yup.
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Old Jul 31, 2016 | 02:17 PM
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Update: No problem since. The gremlin just disappeared.
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Old Jul 31, 2016 | 07:39 PM
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Did you by chance get rear window tint put on the car when it started happening? Mine did this because I think they got moisture inside the trunk and it stopped after it dried.
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Old Jul 31, 2016 | 08:34 PM
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Nope. Nothing changed. No rational explanation.
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Old May 24, 2019 | 04:24 PM
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Whats a SAM? Mine opened by itself this AM

Originally Posted by SteveE400
The problem with ghosts is that when they get bored, they come back.


My dealer "pre-emptively" replaced the rear SAM - meaning that there were no codes shown or pending. They just relied on their experience of having that be the solution for another customer. That's just showing that they are willing to go out on a limb for customers, I guess.


My gremlins haven't been back, either. So, who knows?

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Old May 24, 2019 | 06:14 PM
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Originally Posted by gregorynp
Whats a SAM? Mine opened by itself this AM

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