Headlights not working, but DRL work just fine

Tiny
VULCAN2864
  • MEMBER
  • 1999 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 278,000 MILES
When my car is on during the day, the DRL work just fine. However, when the I go to turn the headlights on using the dimmer switch the lights do not work at all, both low and high beams; though the high beam light will illuminate on my dashboard when trying to use the high-beams.

I have checked all of the fuses and replaced all of the relays in addition to replacing the dimmer switch with no luck. I have also replaced the relay/running light control module with one from a junkyard.
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Saturday, March 13th, 2021 AT 12:12 PM

1 Reply

Tiny
JOE F
  • EXPERT
Hi,

If all fuses are good, the relays are good, and you replaced the main DRL relay above the glove box, power is likely being lost before the switch.

I attached the headlamp wiring schematic below. Check the wires I highlighted at the switch for power. Also, if you haven't already, confirm there is power to the fuses you checked. Note I had to cut the schematic in half to make it readable. I did overlap the two pics so you can follow from one to the next.

Here are a couple of links you may find helpful when checking:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find or if you have other questions.

Take care and God Bless,

Joe
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Wednesday, March 31st, 2021 AT 12:57 PM

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