HVAC Control Plug Wiring 2015 Silverado 2500HD 6.6

[Lucas Hodges]

Hi, I'm looking for the breakdown of the plug for the HVAC controls under the radio display.  I have a 2015 Silverado 2500HD 6.6 High Country.  I have 9 volts on one of the wires.  I just wonder if it's supposed to be that way since everywhere else there is supposed to be power has 12V. This was the closest topic to what I'm looking for. It's the wire I'm pointing to.  It's grey or green (I can't tell) with a yellow stripe.  It's the one next to the black ground wire in the corner. The plug goes into the back of the HVAC controls. Thank you to whoever knows.