I have successfully connected the Stereo output from the Zumo 660 to the 2010 R1200RT’s audio system. The audio from the Zumo will now interrupt and mute whatever is playing on the RTs audio system and the Zumo audio will be heard.
The one fairly serious limitation of this setup is that the level of the Zumo audio is significantly lower that the audio level of the RTs audio. This is the case both with or without the resistors in place (only one channel was connected to test this to protect the Zumo from short circuiting the output.)
It seems that the setup would benefit from some amplification of the signal coming from the Zumo.
I’m not sure what the optimal value for the resistors is, but it seems to work with the values I selected as well as others that I tried. Use my design at your own discretion. If anyone has any data that would support a different value, please let me know.
The attached pictures show the components required and the assembly process to build the required interconnect.
• Acquire the BMW repair connector as pictured
• Acquire a 3 conductor stereo connector or cable to match the audio output on the Zumo
• Acquire 2 resistors
• Assemble the components following the included schematic and photos. Soldering skills and shrink tube required.
• Install the finished cable between the audio output connector on the Zumo and the audio input on the RT (located attached to the frame near the steering head on my 2010) and secure the cable with wire ties are required.
Feel free to duplicate for yourself and enjoy the results, but use at your own risk.
The full set of pictures can be found here: Link to pictures