e53 car key reprogramming

[fennmd]

hi
can anyone advise how to reprogram my ignition keys as remote does not work after fitting new main battery
thanks

[marti]

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.

[fennmd]

hi marty
thanks for that give a try in the morning

[fennmd]

hi marti,
have tried those recommendations no luck with any of them,
could something have happened when i changed the main battery in the car

[henrym3]

Not a reply, more a question. Should the spare key be used on occasions and if so how often.

[X5Sport]

Probably at least every few months.  We use both keys on ours depending upon who is driving as we have all of the key memory functions set up.  If only one driver then probably worth alternating monthly perhaps?  The key batteries are ageing now so they don’t hold a charge as well as they used to.

That being said, we had a car in storage for 18 months and the keys still worked fine.

[marti]

Odd... changing the battery on an e53 never affected my keys....try disconnecting the battery for 20 minutes... just the negative.....