Connect TOMTOM to 6000CD radio?

I am trying to connect my TOMTOM sat nav to my cars 6000cd radio

The only way I get any bluetooth connection is by setting the sat nav to search for a external bluetooth HIFI.

The problem I have is it asks for a 4 didget code which I am not aware of. I have tried 0000, 1234 & even the radio security code but it will not connect.

Has anyone been able to connect their sat nav to the stereo