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2004 Avalanche headlight issue

D21dave

New Member
Joined
Apr 28, 2020
Messages
2
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.
 
Has he had the AV since new or did he buy it used?
Reason being many AV owners did what they call "all 4 on mod" and added wires to make all 4 lights high and low come on and stay on at the same time. Maybe that was done to this AV?
 
could be stalk switch?
 
He bought long time ago. Issue just started the other day. If i unplug stalk completely and dimmer they still stay on.unless i pull relays. High beam light stays on dash until the cab lights time out. I can also pull one of the connectors out of bcm and they go off but truck wont stay running either.
 
Try taking out all the bulbs, and then put them back one at a time...and see what happens.
I've seen weird things happen because of defective bulbs. One that comes to mind is a 20 amp dead short!

CarMech1969
 
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