AUDI A4 A6 Remote Transmitter Coding

Two remote transmitters are supplied with the vehicle. If further transmitters are required, they must be coded to interact properly with the central locking control module.
This procedure must be performed after changing the batteries in keys with remote control function.
Remote transmitter coding procedure
Switch ignition on (using separate key).
Lock vehicle from outside using key to be coded via driver-side door lock.
Press "unlock" button within 5 seconds often enough to reach next memory position (in example given, twice).
Every press of the button is confirmed by the emergency flashers and the anti-theft system horn.
Wait 5 seconds.
Now press "unlock" button one more time (vehicle unlocks).
Switch ignition off and remove ignition key.
Check function of new transmitter.
Existing remote transmitter recoding procedure
This procedure must be performed after changing the batteries in keys with remote control function.
Press any button on transmitter.
If vehicle does not respond by locking or unlocking:
Lock and than unlock vehicle within 30 seconds using driver-side lock.
Now check function of recoded remote transmitter.

Clearing memory positions
It is possible to clear remote memory positions should a remote become lost.
NOTE: this will clear all remote memory positions, remaining or new remotes will have to be coded to memory.
Switch ignition on using key.
Then mechanically lock central locking from outside vehicle using key.
Activate remote transmitter "unlock" button on key five times at one second intervals. A short horn signal will sound each time.
Then, after 6 seconds, press remote transmitter "unlock" button to confirm this clearing procedure one more time.
Memory is now erased, central locking should no longer unlock itself via remote transmitter.
Switch ignition off.
Up to four transmitters can now be coded again.

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