I'm going to show the way that I use to make this retrofit on my 2010
step 1
switch the Pin 10 (red) to Pin 6 (mirror connector)
step 2
I get supply voltage from the red/white wire from the instrument panel to console harness or
CLSTR fuse (F4) is the same circuit. With this wire is it possible to use the mirror (make call or connect to Onstar ) even if the engine switch is off as in the previous mirror by pressing the power button on the stereo and maintain the mirror on until the call is over
or
step 3
I get (Low Speed GMLAN) from instrument panel to console harness
step 4
I cut these wires. (Left-Light green Right yellow/black) the new mirror DOES NOT USE. this harness is under the right kick panel, closest to the door
I use this wires to send supply voltage and data signal
plug the GMLAN wire to Left-Light green
plug the supply voltage to Right yellow/black
step 5
connects the mirror and enjoy it
Apparently in the 2010 the Onstar module the green and red LED's commands to BCM are not sends
any questions send me a PM.