Hope this helps someone... None tried here but the bits and pieces of help that have been posted about in one handy "cut out 'n keep" post :hatoff:
Keys & re-Code
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Changing the Key FOB Battery
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The B6 key fob battery is type CR2032 available from Maplins or RadioShack. If the red LED on your fob doesn't light when any of the buttons are pressed then change the battery as shown in the above YouTube video
General Description
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The VW security system for Immobilsor 4 (IMMO 4) systems as found on Golf Mk5, Passat B5 onwards, etc) supply two key fobs that come part coded from the factory.
When you go to the dealer with all your details, it's so the dealer can be sure you are the legal owner of that particular vehicle.
The parts guy just orders the key from your chassis number, the order is sent to Germany and they part code a blank immobilsor chip to your chassis security details held in the German database. They also cut a physical key, known as the valet key, and attach it to the fob.
The fob can take up to five days to arrive at the dealer in the UK. You then take your car into the dealership, its hooked up to their diagnostic machine and then the pairing of the key you ordered can begin. The techie logs into the car, then starts a key coding process. Techie enters their personal login details and the machine does the rest: it matches the part-coded key to the details that are stored on the database and then codes it to the vehicle system.
There is no way independents or mobile security companies can code the key to the car's new or old keys.
But there are two firms claiming to offer such services are:
ÂŁ110 coded while you wait in Leeds
[URL='http://www.ebay.co.uk/itm/2005-2010-VW-PASSAT-3-BUTTON-REMOTE-SMART-KEY-PROGRAMMED-WHILE-YOU-WAIT-/121056682244?pt=UK_Car_Accessories_Safety_Security&hash=item1c2f8a6104']VW 3 Button Key | eBay[/URL]
ÂŁ175 for same thing in Kent
[URL='http://www.ebay.co.uk/itm/Volkswagen-VW-Passat-B6-CC-Key-Fob-Smart-Key-Remote-Programmed-to-Your-Car-/130909522702?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item1e7ad0cb0e']Volkswagen VW Passat B6 CC Key Fob Smart Key Remote Programmed to Your Car | eBay[/URL]
If You Have One Good Key (not tried here!)
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If your code is lost on one fob you can reprogram it with your other good fob. On the Passat, you must first pry the cover off of the manual key slot in the driver's door: observe from the bottom there is a slot; place the manual key (the plastic valet key released by the side button) from your good fob in that slot; at the same time pry from the bottom and the whole cap will come off revealing the keyhole.
Put the good fob into ignition and press to switch on ignition only but do not start the engine.
With your manual key, lock the door.
Now press the fob you are trying to train twice. It should take the code.
Unlock the door, remove the good fob and test the newly trained fob. It should work -- but only for a fob that's previously been trained to that car's access code. It will not work on a fob that's previously been trained for another vehicle.
If you've Used the Wrong Fob
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I own two '06 Passats. Inserted wrong fob into ignition to start it. Got error code and fob could not be removed. Called dealer and they said car would have to be towed to them.
Checked the internet for help:
1) step on brake pedal.
2) depress automatic shifter knob on "T" handle twice.
3) when click is heard-remove fob...
Broken Key to two Fresh Keys
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A key fob has a RF-ID chip that only works for the one car it was made for. The key fob you bought on e-Bay will not work with your car with one exception. If you happened to have an old, broken key fob for your car you can swap out the RF-ID chips then have the new key fob reprogrammed. Post #24:
http://www.passatworld.com/forums/74-volkswagen-passat-b6-discussion/271181-key-passat-b6.html
B6 Partial RE-train using VCDS
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After a prolonged absence of battery cell voltage, the IMMO functions of a key may still work, it'll still start the engine. But you find you can't gain access to your car -- the locking or unlocking don't work -- even though the little red LED in the fob lights up after changing the battery (see above)
To re-train an IMMO-working keyfob to security system:
VCDS -> Ch46 (central convenience) -> 10 (adaptation) Channel 0: value 0, Save (rests all remotes)
Channel 1: value 2, Save
Press Unlock on each remote for more than one second consecutively. My car did not show any signs of acknowledgement like Ross-Tech said it might.
Close controller, done.
Check operation of each remote for vehicle lock, unlock, and boot. And for vehicle start.
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