[old_master]

The DRL's use the high beam bulbs, (inner bulbs) at a reduced voltage, that's why they are so dim. When low light conditions dictate, the autolamp feature turns the headlamps on and the DRL's off. If the dimmer switch is in the low beam position, and both low beam bulbs are burnt out, only the parking lights will operate. Here's something to try: Manually turn on your headlamps, cycle the dimmer switch from low beam to high beam and check the operation. If only the inner set of bulbs come on, remove both low beam, (outer) bulbs and look closely at the filaments. If both low beam, (outer) bulbs are ok, post back here and we'll continue with the diagnosis.