This is for 2009 9-7x, not sure it applies to other years/versions.
I don't have the official GM diagram, but I looked at several other diagrams online. They all show the HDM driving the low beams, acting as a (modulated) low beam relay. Seems normal. However, looking in my fusebox I have the HDM AND high and low beam relays. The back of the cover confirms with both graphics and text.
Does anyone have a GM diagram that shows this arrangement? Why would it need a relay in addition to the HDM?
I don't have the official GM diagram, but I looked at several other diagrams online. They all show the HDM driving the low beams, acting as a (modulated) low beam relay. Seems normal. However, looking in my fusebox I have the HDM AND high and low beam relays. The back of the cover confirms with both graphics and text.
Does anyone have a GM diagram that shows this arrangement? Why would it need a relay in addition to the HDM?