Thread: Broken key fob
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Old 12-01-2012, 12:59 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,873
Mein Auto: 1997 740iL / 2006 X5 4.4
If taking the route of buying a generic "new style" diamond-shaped key case & blade...first make sure that you have a local keysmith that has the equipment to cut the blade (its not like a simple house key). Secondly, make sure that you buy a blank that has the correct key blade. Not all blank keys sold on eBay have the correct blade for our style of keys. And third, make sure that you buy a key that has the correct RF frequency (315 MHz in the USA...433 MHz in Europe and some other markets). If the RF doesn't match...the the FZV/DWA receiver in the C-pillar won't receive the signal to lock/unlock central locking system & arm/disarm the car's alarm siren system.

Some of our key blades are similar to a sandwich...the section in the middle (the meat) remains solid and uncut...and the top & lower halves (the bread) are the ones that get cut. There may also be a notch cut into the blade near the head of the key. While some key blades are solid from the head to the tip of the blade...and the middle of the blade is cut-out on each side.

Also remember that many blank key vendors on eBay falsely indicate that you can get a BMW dealer to initialize the key to start your car...THAT IS INCORRECT. A BMW dealership has no way to program the EWS transponder inside the key to start your car. As far as programming the key to lock/unlock & arm/disarm (FZV/DWA) your car...you can do that yourself following the instructions that have been posted here and every other BMW forum. Your key contains a transponder that is SPECIFIC to your car and has an ISN (individual serial number) that is assigned to it as well as your EWS control module and DME/ECU. So ALL of the guts/innards of your key will need to be transferred over into the new blank key case.

Good luck.
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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Last edited by QSilver7; 12-01-2012 at 01:03 PM.
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