E-Class (W211) 2003-2009

replaced smartkey batteries, now keyless go doesn't work

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Old 01-26-2005, 05:03 PM
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2003 E320
replaced smartkey batteries, now keyless go doesn't work

a week ago i started getting the low battery warning. i read the manual and it shows how to replace the batteries so i bought the batteries from the local store and replaced them.

now the keyless go doesn't work. the key works if i put it in the ignition but the doors won't open automatically, the buttons on the key don't lock/unlock the doors from outside, and pushing the button to start the ignition doesn't work. they all say key not recognized.

is there anything i need to do to make this work? otherwise it's back to the dealer...

Rock.
Old 01-26-2005, 05:16 PM
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2015 ML 350
Batteries in right side facing up? (+/-)
Old 01-27-2005, 10:58 AM
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W215 CL600
I think you might have to reprogam the key? Not sure...

Anyone else know?

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