Thread: Key Fob probelm
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Old 06-10-2012, 12:40 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
 
Join Date: Aug 2008
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Mein Auto: 1997 740iL / 2006 X5 4.4
EWS components can get out of sync when something major happens...like a power surge, or if one of the components is disconnected/swapped/replaced with another component that's not coded to the car (by owners unfamiliar with the idiosyncrasies of EWS). For instance, if your car falls under EWS 3.3...it contains "rolling code technology" which changes a series of numerical tables with each use...so again, if an electrical surge interrupts a component or a foreign module is inserted into the mix and a failed attempt to start the car occurs...the components can become "unsynced". But under most situations...this is rare.

The FZV/DWA features get out of sync more often than the EWS components due to owners reinitializing a key in an attempt to restore one of the keys features...but only has one of their remotes with them during the session. Thus the other key will no longer remotely lock/unlock & arm/disarm the car. They then redo that key (and not the other)...and it becomes the "dog-chasing-his-tail" scenario.

Here's more EWS info about how all 10 key positions of the EWS control module are coded at the factory when the car is at the factory. Those key positions are then stored until an owner makes a request for a new key, the chip is then installed into the key of choice and sent to the owner. This is another example as to why performing the key reprogramming instructions has NO affect on EWS. EWS chips are already programmed to your car from when it was manufactured at the plant in Dingolfing Germany.

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