Looking for a few more details on the hookup. The Dynavin has only one radio antenna input. You are saying you are using your new amp for the radio so I am presuming you are connecting the output from your amp to the existing dynavin antenna lead. Where are you connecting the output from the OEM amplifier that you are now using for the TMC? Where are you picking up the 12v power from?
2001 E46 325i - Australian RHD
2001 E46 318i - Australian RHD