E46 M3 Nokia 112 hands free kit question.

[PJS917]

I have just bought an E46 M3 and am so very happy with it. It has fitted a Nokia 112 blue tooth
hands free but no code. However the code is the last 4 digits on the comms box. Before I start pulling random bits of trim off to find this box has anyone any idea of the most likely place this box would have been installed in?

[E30M3SE]

Behind the glove box or behind the HU/Nav screen is where I would start, if it is not behind either of these then drivers underdash.