Note: The wire colors may be different for different models/years but the pin info should be the
same.
I cut the C1 and C2 connectors off of the adapter harness I bought leaving about 6 inches of wire to connect
to the mating Molex adapter connector I added to the original harness. I also removed the AUX input
harness/pins that were already in C2 and shortened the AUX harness because it was way longer than it
needed to be. The pin-out info for that is included in the WIS/Service Bulletin on my website. This is what
the modified adapter harness looks like before installation in the vehicle:
And after installation:
Now for the GPS antenna connection …. Again, these steps are not necessary if you install an additional
GPS antenna under the dash as Steve (MBenzNL) and others do. Or, the GPS antenna connector
(rectangular gray, HRS type) may already be located behind the radio, although it was not on mine.
To install and route the GPS antenna coax to the COMAND head unit you need to remove the right side C-
pillar panel, right side front and rear door sill trim plates, and the glove box side access panel. You will
also need to remove the two screws on the access panel below the glove box for cable routing and you
