Key Fob
MBWorld God!
Joined: Dec 2019
Posts: 33,397
Likes: 6,625
MBWorld God!
Joined: Dec 2019
Posts: 33,397
Likes: 6,625
Member
Joined: Apr 2011
Posts: 182
Likes: 74
From: Denver
2005 ML500, 2011 E350 4M, 2012 GL550
I don`t know if he could do it remotely but it won`t hurt to check.
MBWorld God!
Joined: Dec 2019
Posts: 33,397
Likes: 6,625
my key doesn’t have a light
https://cimg0.ibsrv.net/gimg/www.mbw...37bbe55f0.jpeg
https://cimg0.ibsrv.net/gimg/www.mbw...37bbe55f0.jpeg
Junior Member
Joined: Apr 2025
Posts: 17
Likes: 0
2012 GL 450
I can’t believe it but I tried this and it worked. Panasonic 2032 battery and the key works again. I had a new energizer in there and it didn’t work. Insane. Thank you so much, you saved me a ton of headache and time. 🙌
MBWorld God!
Joined: Dec 2019
Posts: 33,397
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My pleasure to help and I am happy to hear it worked, I am just sharing knowledge I gained on the forums : )
Super Member
Joined: Oct 2012
Posts: 538
Likes: 89
From: Hollywood, CA
W209, W124
they can frequently be fixed, especially ones that still partially function
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MBWorld God!
Joined: Dec 2019
Posts: 33,397
Likes: 6,625
Super Member
Joined: Oct 2012
Posts: 538
Likes: 89
From: Hollywood, CA
W209, W124
EIS creates magnetic field that is converted into DC current to energize key to start car. Batteries are there to unlock doors and roll down windows.
For “won’t work in ignition” issues it is best not to fiddle with batteries, it just adds confusion and additional opportunities to damage key.
KLG requires batteries but it is best to fix core issue. If key won’t work in EIS you start there and don’t even think about batteries.
Last edited by MacVidMB-V8; May 26, 2025 at 04:51 PM.
MBWorld God!
Joined: Dec 2019
Posts: 33,397
Likes: 6,625
This may be true, but has nothing to do with starting car.
EIS creates magnetic field that is converted into DC current to energize key to start car. Batteries are there to unlock doors and roll down windows.
For “won’t work in ignition” issues it is best not to fiddle with batteries, it just adds confusion and additional opportunities to damage key.
KLG requires batteries but it is best to fix core issue. If key won’t work in EIS you start there and don’t even think about batteries.
EIS creates magnetic field that is converted into DC current to energize key to start car. Batteries are there to unlock doors and roll down windows.
For “won’t work in ignition” issues it is best not to fiddle with batteries, it just adds confusion and additional opportunities to damage key.
KLG requires batteries but it is best to fix core issue. If key won’t work in EIS you start there and don’t even think about batteries.
Yes I understand the keyfob can start the car without the battery when the keyfob is placed in the marked spot or for those who have keyless go, to remove the push button start and insert then turn. it has an emergency key that you manually open the door when the fob battery is dead after all.
