I will give you the schematic and diagnosis for this problem, but I believe that you will find that it is the multifunction switch. If you look at the diagnosis, there is not much else that causes this except the switch or bad wiring. If you need more info, just ask.
Schematic Reference: Headlights Schematics
Did you perform the Lighting Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Lighting Systems
Turn ON the headlamp switch.
Do the headlamps operate normally?
Go to Testing for Electrical Intermittents in Wiring Systems
Go to Step 3
Do the low beams illuminate?
Go to Step 4
Go to Step 6
Connect a test lamp between the ground circuit of the dimmer switch and battery positive voltage.
Does the test lamp illuminate?
Go to Step 5
Go to Step 7
Inspect for poor connections at the engine wiring harness junction block and the dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 8
Repair the open in the headlamp dimmer switch low beam signal circuit between the engine wiring harness junction block and the dimmer switch. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Repair the open in the headlamp dimmer switch ground circuit. Refer to Wiring Repairs in Wiring Systems.
Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt or Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Standard.
Operate the system in order to verify the repair.
Did you correct the condition?
Butch, for some reason when I turn on the light circuit I can hear the relay clicking, does this mean that the light circuit is actually functioning. One
caveat; have interchanged relays so the same clicking noise happens, but the same result. Are all factors still pointing to the multi-switch?
Thanks Butch for the response, I just want to confirm which switch it is that needs to be replaced. Is it the headlamp/dimmer switch or the turn signal multi-function switch?
Its the multi-function switch. They call the switch that turns your headlamps on, a panel dimmer switch. They call the multi-function switch, a headlamp dimmer switch. Kind of confusing but thats GM for ya. Good luck.