Hi
I have a 2007 328xiT and a 2008 328xi (E91 and E90). I paired my
wife's phone to her car and also paired my phone to hercar without a
hitch. In other words, we have two phones paired to her car, albeit
that only one can be used at the same time, of course. But both are
listed as blue tooth devices on her car's iDrive.
I also paired my phone to my car without a problem, even before I had
the phoneholder installed by the dealer.
The code it's asking for is a code you actually type in using your
phone while you are doing the pairing. Any number will do. When you
are prompted to enter a code on your phone, just press 0 (zero), then
you will be prompted by the car to enter that same code on the keypad
on your car. You only have a certain amount of seconds to do that. If
you do, and the car recognizes the code you just typed on the phone
(in this example zero) your phone will be paired. The code it's asking
for is only a temporary one so it can check the phone if it is
transmitting properly that code, and if it does, then the car will
recognize it and ask for that code number you just typed in so it can
send it back to the phone and establish the connection properly. Once
it's connected it will now proceed to read in the address book etc
from the phone to the car, which can take a minute or so.
Do you have iDrive? That may make it easier to perform this task.
In any event, at least in my two cars, you don't need any special code
or the actual phone it was paired to, in order to pair your phone to
the car. As it turns out, when the dealer had installed the phone
holder and tested it on my car (the E-90) I discovered my phone wasn't
paired anymore. He must have used his phone to do the testing. I just
simply paired my phone again.
It may be different on the 2005 model, but see what the manual says.
Or call a service center or BMW assist.