teamfitz

Lots of posts on DRL but I couldn't find one to match what i'm experiencing. I have a 2015 RX350 with 75k miles, i'm in Texas and recently the daytime running lights have stayed on all the time. whether the vehicles locked or unlocked, whether the headlights are on or not, whether the motors running or not the front running lights remain on. I haven't made any modifications or replaced any parts, all the lights work fine, except for the permanent DRLs.
I'm thinking there must be a faulty sensor or switch but I've no idea how to isolate or fix. Any suggestions for me? Or is there a workaround?

Appreciate any advice.

salimshah

If you plan to diagnose and fix the problem, circuit diagram and test light [voltmeter can be helpful but test light is the best] would be needed. You have already confirmed the problem as DRL staying ON even after switching of the vehicle, plus upto 5 mins of courtesy delay [not that there has to be the delay].

I suspect some relay is staying stuck closed [may or may not be released by disconnecting the 12v]. You might be doing this to preserve battery drain.

You can try to change the control input by turning on the head light manually and flicking the high beams on-off. If nothing it will give you one more clue.

Pleas share what you find as you are among the first to report this problem.

Salim