My remote key does not work on my 3 series BMW

Depending on year & model, you can use the regular key that's integrated into the remote key fob. Simply press the "hidden" button on the fob, slide the key out, put it in the key slot of the driver's door, and turn. How to open BMW 3 series front door without empty remote control Years...

You have to program the new remote, here are the programming instructions on this website.

http://blog.keylessentryremotefob.com/2013/04/2007-bmw-3-series-key-fob-remote.html

At first,it seems your remote has lost its code.Try using your other keys.
Do you have all doors+hood properly closed?Does your key actually turn in door lock!

You might have a door lock actuator (electrical) problem. I would let your local BMW dealer take a look at it. Good luck.

For Remote locking problems I would start troubleshooting the cheap things first.
Replace the battery in your key(s).

CHECK TO SEE IF YOUR REMOTE WORKS. IF SO CHECK LOCK. IF NOT THEN POWER DOOR LOCK ACUATOR IS DEFECTIVE. WAS A REGULAR PROBLEM ON 90'S 5-SERIES

All bmw x3 have immobilizer and alarm system.
To check,lock car with remote
Unlock with key and open door alarm should activate
To stop alarm, shut door press remote.

You must reset your remote control in order for the lock/unlock to work properly.

To reset remote you would:
1)Insert Key in Ignition Turn to Position 1(Don't Start the Engine) for about 5 seconds
2)Turn Key Off and HOLD the LOCK button on Remote while pressing the UNLOCK 3 TIMES
3)Release both lock and unlock buttons you are holding
4)All doors should automatically unlock

And exit the door and lock with the Remote.

this could be seen to be a problem, the servo in your door is prob broken and would require replacement. also if you take the inners of your door and check to see if linkage is connected. does the car make any noises when you press button or use key?

BMW 7-Series - Key Remote Programming
Three methods to try:
Method 1:
1. Working from within the vehicle and with the doors shut
2. Turn ignition to position 1 and back to off within 5 seconds.
3. Remove the key from ignition and press and hold the unlock button for 15 seconds during this time press the key lock button 3 times within 5 seconds.
4. Release both buttons.
5. Doors will lock and unlock to show correct programming has occurred.

Method 2:
To do this procedure you need to have one working key and one key that needs to be programmed.
1) Get in and close all doors.
2) Turn on the ignition and turn off quickly. (No more than 5 seconds) to start the process. Next action must take place within 30 seconds.
3) Remove the 1st key.
4) Hold the key up near your left shoulder (this is so it is closer to the remote receiver antenna.
5) Hold down the unlock button and press the lock button 3 times. Release the unlock button and the doors lock which confirms the operation.
6) Quickly repeat steps 4 & 5 for key #2 etc.
If it does not work, try doing the keys in opposite order. Key 2 then key 1, vs 1 then 2.

Method 3:
Alternate if you do not have a working remote
1. Turn key to position 1 five times very quickly 2. Remove key 3. Hold unlock button then press lock button 3 times, release unlock button.
4. If you have another key do the same button pressing within 30 seconds 5. Turn on ignition to finalise.
PLEASE NOTE: This programming procedure programs the remote control part of the key. Any transponder chip for the immobiliser (starting of car) will not be programmed and must be done by a specialist.
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