GMC Repair: 2002 GMC Envoy Headlights, fuse box, gmc envoy

Question
My headlights turn off every so often.  No rhyme or reason and then they just come back on.  Any idea why?

Answer
Hi
I would suspect either a loose connection or terminal on either the headlight switch, or at a connector somewheres that the circuits for the headlamps go through. Maybe the BCM as it controls headlight functions.
The underhood fuse box/relay center is also a possible fault, as the HDM relay is located there and the fuses.
You may want to take vehicle somewhere and have the BCM scanned for codes, see if there is any for headlamp control.
I hope this helps.
Good Luck
Pawl