In the process of getting extra keys for my Z4 which came with one key.
Have already had one Diamond key cut and have synced it to the car using the hold button and press lock three times as described in the following guide. If you are doing multiple keys you have to be quick to get them synced together.
As to coding to the car the EWS module has to be removed from the car and the file downloaded to the AK90 so the new key can be programmed into one of the unused key slots, no need to write anything back to the EWS as it already has the 1 - 10 keys already programmed into it. Worth saving the Bin file thats downloaded just in case you need it to make another key in the future.n
(Post amended re not writing file back to EWS module see later post by @mrscalex )
I am in the process of using a AK90 coding machine but fell at the first hurdle when the borrowed machine failed to connect to the processor, currently waiting for a replacement machine to try it again as borrowed machine may have duff cable. If the new machine fails I will be looking at investing in a BMW Editor set up which connects direct to the circuit board and negates the hit and miss connection to the processor. That system costs about £60, bit of an outlay to get all the required stuff and buy key blanks with cutting on top of that but still lower than the price charged by BMW for one key. There are services out there by traders that will code a new key but it involves sending them your working key and the EWS module for them to do it, usually done by return post so a couple of days. I notice that they advertise on ebay, locations Lake District and London for these traders. They seem to do one key for cica £50.
Guide to syncing keys to the Central Locking are...................
BMW Z4 - 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.
