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

Smart key problem

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Old 06-03-2017, 04:37 PM
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Smart key problem

So yesterday I had an issue turning the car on. First i noticed that the doors didn't unlock right away. So first thing I did was go and buy a new battery for my key. Did that. Still having the same issues.

Here's what happens

I have to press the unlock or lock button several times or hold down until it actually locks/unlocks

Then whole inside the car. I put the key in and turn it. But it acts like there is no key present at all until I play with the remote a bit or press down on the remote. Then it lights up the dash as normal. I have to keep messing with it until the car turns on.

I haven't hooked up a scanner or anything yet. Has anyone got any insight to this issue ????
Old 06-03-2017, 06:25 PM
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Do you have a second key? Does it act the same?
Old 06-03-2017, 06:28 PM
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Unfortunately I don't. I do have another key that is not for this car. I tried it just to see how fast the response is. And it said something like they key isn't recognized.
Old 06-03-2017, 06:48 PM
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If it scanned the other key and sent a "do not recognize" without you having to fumble with it, then I would suspect you have a bad key.
Only a dealer can order you a key and they are not inexpensive. There are no Ebay blanks, etc that can be programmed. It needs to come from the dealer.
Old 06-03-2017, 06:49 PM
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Thanks. I'm going to call them tomorrow
Old 06-03-2017, 06:53 PM
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Old 06-03-2017, 10:46 PM
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Originally Posted by Heisenberg5070
So yesterday I had an issue turning the car on. First i noticed that the doors didn't unlock right away. So first thing I did was go and buy a new battery for my key. Did that. Still having the same issues.

Here's what happens

I have to press the unlock or lock button several times or hold down until it actually locks/unlocks

Then whole inside the car. I put the key in and turn it. But it acts like there is no key present at all until I play with the remote a bit or press down on the remote. Then it lights up the dash as normal. I have to keep messing with it until the car turns on.

I haven't hooked up a scanner or anything yet. Has anyone got any insight to this issue ????
Originally Posted by Heisenberg5070
Thanks. I'm going to call them tomorrow
What year is your car? Did you purchase it CPO? Since you only got one key, I suspect not.
But if it is still under warranty, you may be able to get them to give you another/a working key as a warranty claim.
Old 06-03-2017, 10:48 PM
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Originally Posted by tresean1
What year is your car? Did you purchase it CPO? Since you only got one key, I suspect not.
But if it is still under warranty, you may be able to get them to give you another/a working key as a warranty claim.
Unfortunately it wasn't purchased cpo. And it is out of warranty. So the only thing I think I can do now is go to the dealer and suffer the costs.
Old 06-03-2017, 10:48 PM
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Sounds like what happens when I have my key in the same pocket as my phone. Did you check the battery with a multimeter or other tester? Don't assume it has the proper voltage.

Keep us posted.
Old 06-03-2017, 10:49 PM
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Originally Posted by thefisch
Sounds like what happens when I have my key in the same pocket as my phone. Did you check the battery with a multimeter or other tester? Don't assume it has the proper voltage.

Keep us posted.
Purchased a brand new battery for it. Thought that was the problem.
Old 06-03-2017, 10:53 PM
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Originally Posted by Heisenberg5070
Purchased a brand new battery for it. Thought that was the problem.
I saw that, but I've gotten new batteries that didn't have the proper voltage so I'm in the habit of checking them. These keys start flaking when voltage gets even a tad under 3v. Not saying that it's that for sure, just an easy thing to check before you go to dealer.

If the battery is at least 3v on the meter, you can also check the contacts in the key itself and bend them to provide better contact in case that's the issue.
Old 06-03-2017, 11:11 PM
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Originally Posted by thefisch
I saw that, but I've gotten new batteries that didn't have the proper voltage so I'm in the habit of checking them. These keys start flaking when voltage gets even a tad under 3v. Not saying that it's that for sure, just an easy thing to check before you go to dealer.

If the battery is at least 3v on the meter, you can also check the contacts in the key itself and bend them to provide better contact in case that's the issue.
I'll def give that a try
Old 06-04-2017, 11:26 AM
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It sounds crazy (I still don't believe it 100%), but my SA told me to only use Panasonic Batteries. I told him I bought the expensive Energizers and Duracells, so why were they "dying" so quickly? I stocked up on Panasonic's from Amazon.
Old 06-04-2017, 12:04 PM
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Originally Posted by Heisenberg5070
Unfortunately it wasn't purchased cpo. And it is out of warranty. So the only thing I think I can do now is go to the dealer and suffer the costs.
atleast you could've asked us on or before may 30th. We have a 100$ off of 200$ or more coupon for servicing. But, if you talk to the SAs nicely, they might consider it as a discount for the 2nd key.
Old 06-04-2017, 12:05 PM
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Originally Posted by raja777m
atleast you could've asked us on or before may 30th. We have a 100$ off of 200$ or more coupon for servicing. But, if you talk to the SAs nicely, they might consider it as a discount for the 2nd key.
This just happened a 2 days ago
Old 06-04-2017, 12:11 PM
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Originally Posted by Heisenberg5070
This just happened a 2 days ago
I Know, I'm sorry I couldn't save you 100$.

I didn't read all the comments above, so, if you don't have keyless go, the cost is less than 300$ I believe, else 385$ or less than 450 for the other.
Old 06-04-2017, 12:12 PM
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Originally Posted by raja777m
I Know, I'm sorry I couldn't save you 100$.

I didn't read all the comments above, so, if you don't have keyless go, the cost is less than 300$ I believe, else 385$ or less than 450 for the other.
Would that include the purchase of the key and programming?
Old 06-04-2017, 12:14 PM
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Originally Posted by Heisenberg5070
Would that include the purchase of the key and programming?
I believe so, because before buying my current one, I looked at other vehicles and it was missing a key. When I asked the dealer for a quote for the replacement and he mentioned that price. I assume everything is included.

Also, first have them tested, may be it is a normal fix..!
Old 06-04-2017, 12:16 PM
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Originally Posted by raja777m
I believe so, because before buying my current one, I looked at other vehicles and it was missing a key. When I asked the dealer for a quote for the replacement and he mentioned that price. I assume everything is included.

Also, first have them tested, may be it is a normal fix..!
I'm going to give a few dealers a call. I developed a good relationship with one so I will try them first.
Old 06-04-2017, 12:16 PM
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Originally Posted by Heisenberg5070
I'm going to give a few dealers a call. I developed a good relationship with one so I will try them first.
good luck, hope that is something an easy fix
Old 06-04-2017, 01:00 PM
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Originally Posted by AkaSigFreak
It sounds crazy (I still don't believe it 100%), but my SA told me to only use Panasonic Batteries. I told him I bought the expensive Energizers and Duracells, so why were they "dying" so quickly? I stocked up on Panasonic's from Amazon.
OP, this also sounds crazy...but did you buy the correct battery?
I believe some are CR2025 and some are CR2023, etc. I would verify you installed not only a certain brand, but a certain model/type.
That could possibly have something to do with it.
Old 06-04-2017, 01:01 PM
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Originally Posted by tresean1
OP, this also sounds crazy...but did you buy the correct battery?
I believe some are CR2025 and some are CR2023, etc. I would verify you installed not only a certain brand, but a certain model/type.
That could possibly have something to do with it.
Yup. Made sure of it. 3 times.

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