The head unit and it are tied together on the DataBus, but not otherwise as far as I am aware....the climate control does communicate with the IPM (instrument Panel Module) as well....if you cut a wire, did you check both fuse boxes, (hood and under back seat)? Is it possible you might have cut ...

I know this is an OLD thread but I am having a problem with the climate control display not lighting up,this happened after I installed an after market HU..yes I used a PAC RP3-GM13 interface so I cut NO wires.so i get everything plugged back in and the climate control no longer works no display on ...

anyone know if the climate control is tied into the factory HU? or is it seperate on its on circuit,if so it has to be switched through the IGN circuit

Car is a 2004 Bonneville SLE with On-Star Hi everyone,I have a unique problem,I have installed a Alpine ute-62-bt hu using a PAC rp3-gm13 data-bus interface (Non-Onstar interface ) got everything wired up after some modification of the dash cavity.. and now my dual climate control will not work nor ...