Your in for a real treat.... i had a similar problem with mine, the stock gm wiring is terrible, your best bet pull the wiring apart in the front of the car and inspect each wire splice they tend to corrode and once it gets to a certain point it wont allow any electricity to pass, i ended up rewiring the entire headlight system myself. good luck
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If none are working, you need to check the switch itself. The switch acts like a fuse (actually a self resetting breaker), there are no others. If the headlights are partially working, check bulbs. If the headlights are dim or do weird patterns when the high beams are turned on, check ground wires.
Pretty simple. The headlight switch has a circuit breaker built-in for the headlights so you would check power in and out of the switch if none of the headlights work. If you have power in and out of the switch the next step would be the dimmer switch.
No headlight relay I know of. If none of the headlights work, problem could be the dimmer switch or the circuit breaker built into the headlight switch. You would check for voltage in and out of the switches.