Two problems related to headlight switch have been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
About 4 years I noticed my low beam headlights sometimes would not work at night, forcing me to drive with my high beams on, blinding other motorists. This was reported to the dealer's service manager and he said it may cost $500 to determine the cause. I could not afford this expenditure. I try to avoid driving at night and only recently I had to drive at night and again my low beams would not work, forcing me to again drive with my high beams on. My fianc� did a google search and learned this is a common problem with this fuse/relay. We learned we could pull out the high beam fuse/relay which is identical to the low beam and switch them. Upon doing so, the low beams once again worked.
The contact owns a 2005 GMC Envoy. The contact stated that while driving at an unknown speed, the low beam headlights failed. The vehicle was taken to a private mechanic, who diagnosed that the relay switch for the low beam headlight assembly needed to be replaced. The vehicle was not included in NHTSA campaign id number: 07e014000 (exterior lighting). The manufacturer was notified of the failure. The approximate failure mileage was 103,750.