my 99' e300td has been displaying "lamp defective" in the message center. The lamp that is not functioning is the drivers side small headlight. Not the big one, but the smaller one beside it. I replaced the bulb and it did not fix the problem. To be sure that I didn't buy a bad bulb, i switched it with the bulb on the other side. Still, it is not working. Any ideas what could be causing this, or what my next troubleshooting step should be? Thanks.

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2006 E320CDI- current dd
1999 E300TD - retired
Wilmington, NC USA