Auto headlights pet peeve
 

Maybe, if you are outside and the knob is in OFF and the headlights are ON then you need to make a trip to the dealer or troubleshoot it yourself. Maybe a broken headlight switch. If you have the Command system there is a setting to keep the headlights on for a certain period of time after the car is turned off and you exit. That will override the headlight switch.

I never had an issue or seen anyone when position at 0 and their headlights still auto come on. Error in wiring?
Def an issue.

Are you sure you're not getting confused with your DRL's?

Absent of that, are you saying that if you're in your driveway with the switch set to "0" that the lights are off. Then when you pull into the garage, the lights come on? That's not right. I can turn my lights completely off in the middle of the night and they stay off.

My guess is a bad switch.

Position "0" with DRLs set to ON in the instrument cluster is the same as postion "AUTO" on the headlamp switch. It's stupid IMO, but there's a 'safety reason' behind it. If you turn off the DRL function in the IC and switch the headlamp switch to "0" then all exterior lights stay off completely. Position "AUTO" still works as intended but no DRLs in bright ambient conditions. If you have a facelifted model the DRLs only turn on when the low beams turn on. Hope this helps.

Cone think about it there could be a bad relay. First question, did this just start or has it been that way since 2011? If it just started then check the relay. The headlight switch doesn't actually supply power to the headlights, it powers a relay that supplies power to the headlights. The relay could be stuck. The contacts could be stuck closed. Could try tap it gently or just replace, they are cheap and just plug in. I think they're in the fuse panel. Get out the manual that body reads or the inside of the fuse panel cover should I'd it. Or the headlight switch has gone bad.

I definitely need to check my relay, and or switch. I noticed today that no matter what time of day and with the switch in the "0" position, my headlights come on as soon as I start my truck. :wall:

What setting do you have your DRL set at in the setup in the dash display info?

I will check for that first chance that I get but, it didn't do that before and I haven't changed anything so, I find this to be weird. Maybe I did change it and just didn't realize it.

Oh, I see. It wasn't clear from your first post. I guess check it just to be sure, but yeah, it'd be odd for it change by itself. Maybe a battery change could have reset it - I dunno.

I did just disconnect the battery in order to reset the clock. That could have possibly done it.

Only partially correct. This only applies to the headlights. The other bulbs do not go perma-on.

Problem solved, had to change it back in the dash settings, then decided to leave it on constant anyway. :nix:

At least that was a "freebie" fix!

DRL is set to On. If I turn them to off the LED units dont turn on....so assume it's the proper setting

Yea weird. Mine are like that too. Mercedes Benz 2011 GL550. I leave the DRLs "On" in the dash/speedometer cluster portion. If I try to turn the headlights off when I'm in a dark location, they stay on, even at the "0" portion.

Have any of you guys checked the manual to see if there's a way to turn them off (again, mine is a '08, but they stay off if I want them to)? Maybe some sort of switch-turning combination?

It appears there are different "rules" the car follows depending on whether it was originally sold in Canada or the US, as well.