Huge thanks to IAmSuperBleeder for the detailed instructions. Bought a second hand Seat Exeo a couple of months ago and I've just had to remove the battery to unblock the bulkhead drains. The previous owner couldn't remember what he'd set as the password and you've just saved me a fortune as I would have had to remove the factory fitted 930BT from the car and send it to Pioneer. Once again. many, many thanks.