One of my customers has used this term for a market study about new car features.
It is also mentioned in the Langenscheidt Technical PC Encyclopedia.

HTH,
Patricia

Freigabe is translated by all dictionaries as release. However, in your context that may be too little.

Ernst has the following on "Freigabe":
Freigabe f, Auslösung f (Masch) / release, disengaging
Freigabe f, Entblockung f (Bahn) / clearing, unblocking, freeing
Freigabe f (DV, Fernm) / release
Freigabe f (F.Org) / release
Freigabe... (Signal) / enabling
Freigabeanweisung f (DV) / release statement
Freigabebefehl m (DV) / enable command
Freigabeblock m (Bahn) / clearing block
Freigabe-Blocksperre f (Bahn) / device for effecting manual block
Freigabedatum n (F.Org) / release date
Freigabedatum, Verfalldatum n (DV) / expiration date, purge date
Freigabefeld n (Bahn) / permission mechanism
Freigabegrenze f (Luftf) / clearance limit
Freigabeimpuls m (DV) / enable pulse
Freigabeleitung f (DV) / enable circuit
Freigabeschalter m / release switch
Freigabesignal n (DV) / enabling signal
Freigabesignal n (Fernm) / release signal

Basically the comfort system unblocks the window lifters, by giving the appropriate clerance to the door control system.
HTH
Freigabetaste f (DV) / release key

In this context, I would use enable:

The convenience features control unit enables the window lifters for the door control units.

All other words ohne Gewaehr!