2003 GMC Envoy low beam head lights will not come on. The bulbs are not blown, fuse's ok, no power coming to the head light connector. minimal power to the fuse compartment with fuse removed. 9 to 10 volts. Parking lights work when head light switch is on low beam but no low beam lights. High beam work fine.

The problem is a Headlight module. Fuse box under the hood has two black modules side by side, the one on your right is the headlight module the one on the left is the fan module. Try swapping them, if the headlights work replace bad module, don't drive vehicle with the bad module in the fan slot. Mine kept going bad because I had a high intensity bulb on one side.

Joe there is a fuseblock under the hood and there is a fuse next to the fan fuse thats for the headlights take the fan fuse and put it in the haedlight space then try it should correct the problem I had the same problem biouht a new one at pep boys. Good Luck