Low Beam Headlights

How do you troubleshoot the low beam headlights on a 2015 Tundra? The driver side and passenger side went out at the same time. Fuses are still good. Don't know how to test relay.

 

Can you give a little more info? I assume they were both working and the just quit? Do the bright lights still work?

 

Any chance it is the headlight stalk itself? I had this same thing happen on a VW I owned years ago. I flipped the stalk from hi-beams back to low and suddenly the headlights went out. Found out it was the switch in the stalk that went bad.

 

Start by checking the bulbs to see if the filament let go. If both died close together, check your charging system. If it's too far north of 14V it can take out the bulbs. Any chance the battery is venting acid? If so you might have other issues.

The relays usually have markings on them. The coil side gets 12v and then verify contacts close using a DMM. It show zero to 2 ohms or less. But honestly I can't imagine both relays dying at once.

Start w bulb inspection.