DRL issue

2018 4Runner
DRL does not work - but lights can be turned on
Abt 6 mths ago I put LeD in wifes car
She noticed a hummong abt 6 wks ago
Now no DrL

Bulb or sensor?
I do not thing bulb since can be turned on manually

 

Any answers?

 

I'm guessing, please be aware! I would bet the sensor feeds a relay, which turns on the DRL lights. When you put the LEDs in, you reduced the current draw throughout the system dramatically. I would guess, again a GUESS! that the sensor, feeding the relay coil, either fried the relay coil, hence the humming, or fried the relay's contacts. Lower current draw than the system is designed for will cause parts, like relays and capacitors, to heat up a great deal, and eventually fail.

Did you check the fuse(s)? Did you pull the cover off any relays in the system that are directly involved with the lights, and ohm their coil and contacts? Might be worth a look, anywho...

Good luck!
Pat☺