Quote:
Originally Posted by LizardOfBodom
I wonder - does second key (the one that is confirmed NOT working) can be programmed to the car if it once was working? (assuming it was for this car but just lost the code)?
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Yes.
The process of adding a key requires that ALL keys be present
The process will
enable only those keys physically present, and also
disable all keys not physically present.
Thus ensuring all lost / missing / stolen keys not present on the day cannot be used to start the engine.
Part of the robust security concept.
And remember the way the keys work:
A passive (non-powered) transponder with a unique serial number is fitted to each key-fob. The serial number of the transponder is entered into the vehicle's immobiliser system, thus only known transponders can mobilise the vehicle (permit engine start).
An active (powered by the little battery inside the key) rolling code transmitted is used for the lock/unlock functions. The rolling code needs to be synchronised with the car's UEM to permit that remote control to lock / unlock car (and whatever other functions exist as buttons on the key).
A physical key blade is mechanically paired to the physical key lock in the driver's door, ignition switch and sometimes glove-box. A replacement means cutting a new key. Key blades cannot be disabled electronically. Only physical replacement of the locks can stop a stolen key blade from physically opening the driver's door.