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With an original key (rather than a cheap replacement key shell), the key pulls apart lengthways, leaving you with two 'halves' - the bit with the flip key blade, and the bit with the buttons and pcb inside. The latter then splits in half again - you'll see a line running along the groove where the key blade lies when folded, prise the two halves apart. You'll see the CR2016 battery which can then be replaced. Reassembly is the reverse of dismantling. You shouldn't need to reprogram the fob, but if you do, proceed as follows - you MAY need to do this for each key that you have, even if they worked before;
1. Press and hold the unlock key on a remote
2. Insert key in ignition and turn to on (while still holding unlock)
3. Hold unlock button with ignition in the on position for 2 seconds
4. Turn key to off, remove from ignition and release button.
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