Discussion
This happened to me (e46 M3) and method 1 worked for me first time.
Method 1 (proven method!)
The remote key sometimes stops functioning because it loses synch with the rolling code. It can be reset by doing the following:
1) Get inside the car and close all doors.
2) Switch the ignition briefly to position 1 and then switch off again (position 0) - this must be done under 5 seconds.
3) Take out the key, get out of the car and then close the door.
4) Whilst pressing button 2 (unlock/disarm), press button 1 (lock/arm) 3 times and then release button 2 - this must be done under 10 seconds.
5) A successful initialization will be acknowledged by an automatic locking and unlocking of the car.
6) Repeat 4 and 5 with the other key straight away.
Method 2
To do this procedure you need to have one working key and one key that needs to be programmed.
1) Get inside the car 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 this does not work, try doing the keys in opposite order, i.e., key 2 then key 1 instead of key 1 then key 2.
Method 3
Alternative method if you do not have a working remote key.
1) Turn key to position 1 five times very quickly.
2) Remove key.
3) Hold unlock button then press lock button 3 times, then 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.
Method 1 (proven method!)
The remote key sometimes stops functioning because it loses synch with the rolling code. It can be reset by doing the following:
1) Get inside the car and close all doors.
2) Switch the ignition briefly to position 1 and then switch off again (position 0) - this must be done under 5 seconds.
3) Take out the key, get out of the car and then close the door.
4) Whilst pressing button 2 (unlock/disarm), press button 1 (lock/arm) 3 times and then release button 2 - this must be done under 10 seconds.
5) A successful initialization will be acknowledged by an automatic locking and unlocking of the car.
6) Repeat 4 and 5 with the other key straight away.
Method 2
To do this procedure you need to have one working key and one key that needs to be programmed.
1) Get inside the car 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 this does not work, try doing the keys in opposite order, i.e., key 2 then key 1 instead of key 1 then key 2.
Method 3
Alternative method if you do not have a working remote key.
1) Turn key to position 1 five times very quickly.
2) Remove key.
3) Hold unlock button then press lock button 3 times, then 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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