I have retrofitted a Volkswagen OEM Bluetooth unit to my Golf MK6 which has a factory RNS310 Navigation Radio fitted. The CAN BUS Gateway has been set using VCDS to show the bluetooth module present. All connectors are seated fine but when pressing the phone button the RNS310 just mutes as it did before and doesn't show the phone display.
I have access to a car with an RNS510 and swapped this unit with the RNS310 in the problem car and the phone display is correctly selected by pressing the phone button on the unit. The phone pairs fine with both units (I hear the chime on connect), I just can't select the phone display on the RNS310. I had a look through the 37-Navigation channel in VCDS but see no documented settings I can change for the phone button.
Is there some setting which can be changed through VCDS for the RNS310 phone button to function correctly with the bluetooth unit fitted (not mute)? If anyone can assist, it would be appreciated! Thanks.