Hi,
Just changed the battery CR2016 in one of my key fobs. ( UK stock 350z ragtop, 07 plate )
Managed to rinse the settings from BOTH by not following the instructions in post #7 TO THE LETTER! ðŸ´
BUT If you do manage to render both key fobs useless, don't panic!
Things I had missed...🤔
Car MUST be unlocked either with a functioning key fob or by switching the ignition on to defeat the alarm via onboard transponder using the key fob you need to program. Then leave that key in the ignition.
BOTH doors must be unlocked, either by blipping the unlock button twice or reaching over and unlocking the passenger side manually.
Then do the ignition switch LOCK to ON and back trick six times in ten seconds - the ignition will be OFF at the end of the sequence.
Leave the key in the ignition, the indicators WILL flash twice. If they don't you aren't in Register Mode. Take the key out, lock and unlock the car, set the alarm off, turn on the ignition, unlock the passenger door.
Start again. Don't despair.
After the indicators have flashed twice ( or you hear the relay click twice if it's daylight ) press AND HOLD the UNLOCK button on the keyfob, press and release the LOCK button three times THEN ( and ONLY then ) release the UNLOCK button.
It doesn't always work first time!
If you DON'T see/hear the indicators flash once, simply start again from press and hold, there's no need to go right back to square one.
When you eventually DO see the single flash, you've programmed your key fob 😀
You have also UNPROGRAMMED any other keyfob you might have...👿
REMOVE the key you have just programmed from the ignition - DO NOT switch the ignition on or move the key from the O/LOCK position.
Put your next key into the ignition, DO NOT turn the ignition on ( as that would restart the registration process and unregister the keyfob you've just registered! ) simply do the HOLD/PRESS X 3/RELEASE routine as often as you need to to see the single flash that confirms that your second keyfob has been accepted.
THEN switch the ignition on with the last key you programmed.
You WILL see two indicator flashes if you have succeeded.
If you don't, or all the keys don't work when you try them, then it's back to the top of the page 😕
Took me about five goes to get the process right!