For the last few weeks, I’ve been having problems locking and unlocking my car using the remote built in to the master key. While Chris’ key works fine, mine was working intermittently. I changed the battery of the remote, which allowed it to work for a while, but several days later it stopped functioning altogether. I found myself locked out of my car with the car alarm armed. The only way in is to unlock the car manually and trigger the alarm in the process. Quite an attention grabber when you are in a mall parking lot and your BMW 323i is wailing.
Maybe the battery I put in was defective (or maybe I was too sleepy, absent minded, or confused the first time I replaced the battery that I put in the old one). So I replaced it again. This time, I could tell that there is enough power on the battery since each button press on the remote elicited a bright glow of the red indicator light on the remote. But there was no response from the car. It seems like the car “forgot” about my key. It refuses to recognize it, while continuing to respond to Chris’ key.
I searched the manual for a way to re-program the key but did not find a single mention of programming the key. It’s as if BMW expects all owners to go back to the dealer for any little malfunction. Next stop, google! After a few searches, I stumbled across a document which described how to reprogram a BMW E46 master key (E46 is what BMW calls the 2000 323i). Here are the steps to re-program the key (all credit goes to the original poster):
1. Open the car doors using the remote function of your working key.
2. Get in and close (don’t lock) all the doors.
3. Put the key in the ignition and switch momentarily to position 1 which is
the first position when you turn the key clockwise. This is the accessory
position. Don’t stay in position 1 longer than 5 seconds; then turn the key
back to the off position.
4. Remove the key.
5. On the key transmitter, press and hold the unlock button. Press and release the lock button three times within 10 seconds while still pressing the unlock button.
6. release the unlock button.
7. The system indicates re-programming by locking and immediately unlocking
the door locks.
8. If you want to do more remotes, you must do each within 30 seconds of
step 7 for the preceding key. You just need to repeat steps 5 through 7 for
each key after the first.
Why don’t they put these things in the manual?
-- Posted in Geeks Paradise