You need to turn your radio off, hold down Buttons 2 and 5 (or 1 and 6) together and then turn the radio on. It should scroll through a number of different numbers but, eventually, should give you a six-digit number beginning with either an "M" or a "V".
Failing that, just obtain a pair of radio removal tools, pull the radio out a couple of inches from the dashboard, and read the serial number from the white label stuck onto the radio's outer casing.
Once you've obtained your serial number please come back to us and I'm sure we'll be able to help you.
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