My grandfather has a issue that has came up on this 2004 avalanche. The low beam and high beams are stuck on. The high beam light on dash is stuck on and does not change with lever. If i pull relays underhood they go off but light on dash stays on. DRL, high beam and low beam relay removed. The hazards, turn signals, running lights , dimmer all work. If i force the lights off on dimmer switch the running lights turn off but head lights and high beam stay on. If i pull the first large connector out of BCM the dash light goes off but truck will not stay running.