Chevy Avalanche low beams

Check for voltage and ground for low beams. Orange wire is voltage, yellow wire is ground for low beams. The yellow wire is grounded through the dimmer switch. Don't know about recalls?

Did you use a voltage tester on the orange wire? Hi beam and lo beam get voltage from same source.

That yellow wire is ground and goes to dimmer switch.

When checking for voltage, did you have the headlamp switch on?

If no voltage, the dimmer switch has nothing to do with it. Use a jumper wire, proper size, just for testing, from hi beam orange wire to lo beam orange wire. Does the low beam work?