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Ben:
I'll look around at work and see if I can get an answer. My impression is that the DRL's are only on with the headlights "off", turning on the headlights deactivate them. I also believe the DRL's are only the 2 bulbs in the headlights that used to be the foglight socket. The feature in the US is only available starting in 2002 (on an ML). Be aware we did try to activate them on a 2002 and had trouble with the AAM and ended up not being able to activate DRL, may be an isolated case though, the guy at MB said they are working on a fix. I don't believe the tail lights will come on with DRL's, not 100% sure on that. On GM cars with DRL, the tail lights don't come on. Also, on Canadian ML,s, and I believe all or at least MOST of their cars, setting the parking brake for some odd reason also deactivates the DRL's, I'm not sure if this is true with US versions or not.
Gilly
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