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Put the key in the ignition and turn the key 2 clicks to the On position and press and release the lock button on the fob. Then press and hold the unlock button on the fob 5 times and then release. This will reset the fob for your Mercedes.
1 Insert the key into the ignition. 2 Press and hold the "LOCK" button on the key fob. 3 Remove the key from the ignition. Keep the "LOCK" button held down while removing it. 4 Press and release the "UNLOCK" button five times. 5 Release the "LOCK" button. The fob is reset.
You do not have to reset the key fob when changing the battery.
I had same problem with my s reg mondeo if you have a 3 button fob which operates the boot as well its is simple 1 insert key in to ignition 2 turn key from position I to II four times within 3 seconds (your red led next to the clock should be on constantly) 3 remove key 4 press any button on the fob and your done hope this helps
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The batteries in a Ford Mondeo key fob go in with the positive side facing up. This is the more flat side with the writing on it.
how to reset remote key fob for Mercedes SL 320
put the key in the ignition push the lock button on your keyfob, pull th key out while holding down the lock button and press the unlock button 5 times. Your key is now reset and ready for use
look in the owners manual
press button twice very quickly, then put key in lock, turn to position two. job done
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