blown headlamp

I'd use wiring diagram and check voltage and ground circuits for head lamps. You can see head lamp fuses, use a test light and check for voltage, headlamp switch on, r/l, hi and lo beams. When you turn on headlamp switch it signals the bcm to ground the relays. I'd do all the testing I could to try to find the problem. bbbind.com should have free wiring diagrams and service bulletins. You could check bulletins to see if anything listed for headlamps? Just my opinion.