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Discussion Starter #1
Well, passing the old family vehicle down to a 16-year-old son usually means problems to follow. To wit, he has already lost two of the three original keys that came with our old '99 ML 430. The key he has left is one of the two fully remote auto keys that came with the car. However, none of the RF remote features (for instance - all lock or alarm) work. Do these keys have a replaceable battery inside? Has anyone here have this problem? If so, what is the fix, if any? Again, thanks in advance!

ReBell in MS
 

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ML550, W212 E350 4 matic, 1966 Corvette C2 convt.
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2,675 Posts
Yes the keys have a battery. I am surprised that it has not been replaced before.
 

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2012 ML350 4Matic Capri Blue Metalic w/ Almond interior
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104 Posts
There should be instructions for battery replacement and resyncing the remote in your owners' manual.

Resync:
1 - Turn key to position 2 (ON) then to position 0 and then remove
2 - Within 10 seconds, push and hold the lock button while pushing the unlock button five times

Hope this helps :)
 

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2002 ML320, 2005 S430 4MATIC RIP, 2010 F150 Crew Cab
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You know there were only 8 keys made for that vehicle, right?If he keeps losing them, you'll be looking at a new AAM at about $3,500!
 

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2012 ML350 4Matic Capri Blue Metalic w/ Almond interior
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cmitch said:
You know there were only 8 keys made for that vehicle, right?If he keeps losing them, you'll be looking at a new AAM at about $3,500!
At which time i would get rid of the kid and keep the car :)

Just kidding......OK, well, sorta.....
 

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98ML320
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There are also instructions on battery replacement on the KEY itself, molded into the plastic.

You should mention to your son that the next key will cost over $200 to replace and takes some time for shipping.
 
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