I would guess that an 03 probably wouldn't have BT. Although I wasn't told, my assist module was probably BT too. When I looked through my owner's manual wallet, I found a BT card with a 4 digit passkey code that matched the code on a sticker on the module in the trunk. If you have this card with a code (not 0000), then you would probably have a BT module. You would probably still need a pairing button, but that can be easily installed under the center console as shown in other threads/links. The button doesn't even have to be mounted, since it's only used once to pair the phone.