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Old and New side by side
Dremel Tool to cut along the edge where the glue/welding would be.
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The corner where the key release button is mounted is completed cut off. Be careful not to cut too
much to the other side where the RF id chip is located.
The cover on the left of the Mercedes logo is the battery cover. I trimmed it off and put it back on so
that the batteries are still connected to avoid resync later on but I ended up have to resync it anyway,
so just remove the battery cover. (I was careful the first time, keep checking to see it the remote still
function along the way, that’s why the batteries still in). By the way, what I observed was that if you
take the batteries out for a brief time, then put them back, no resync is needed.
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With the battery cover removed, or trimmed, you can continue to cut along the edge of the case around
the battery housing.
When you feel enough cutting to get rid of the glue/welding along the edge, you can start separate the
halves. Use small screw drivers will help.
You might want to start from the corner where the key release button used to be. Be gentle…
Be careful and make sure that you don’t let the RF id chip flying off, it’s small
I taped the RF ID chip here to show where about the chip is.
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Not it’s time to put it back together with new case.
Since the case I got from fleabay is not quite for ML350, it’s fit ML320 and other models but I bought it
anyway it’s about $15 include shipping instead of at around $30, I had to do a bit of modification.
I had to peel off the key pad covers – don’t worry, you can put them back – and widen the holes so that
button switches from the circuit board will line up properly. Otherwise, the button(s) might be pressed
all the time be the case and you will have hard time to resync (I learned the hard way )
This picture shows the uncut key plate assembly and my original key plate which fell off the key base.
For the key plate, I had to transfer the old plate over because the base of my original one broke …which
is the reason for the upgrade….I t would be easier if I could find a place to cut the plate, but could not
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find any place they would do that for a reasonable price. Hopefully you don’t have to do the same thing.
It a bit involved just swapping the key plate.
You see the white plastic? That’s to hold down the RF ID chip. The new case does not include this and I
had to cut/modify it a bit.
Now, put the PCB on top after placing the RFID chip underneath the tab, don’t forget the RFID chip.
Without the chip, the car won’t start. A piece of double tape will help to keep the chip in place too.