I have confirmed that on my car it is the fog lights that come on after you close the door. Also, the fog light bulb is in the same reflector housing as the main lights so it is hard to tell the difference (took me a couple of tries before I was sure). I checked the diagrams on AllData (always a pleasure...) and it does not appear that the headlights are on the CAN bus. Only other thing I can say is that when my headlamp bulb burned out, the "bulb out" lamp on the dash went on right away. It is an orange lamp near the bottom of the cluster with a picture on it that looks sort of like a light bulb!! Do you have that on? Another question is does the high beam work on that side?

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra