I have an 03 4Runner with DRL's, the low beams have recently stopped working. The DRL's and the high beams both continue to work (both when on and when the stalk is pulled all the way forward) The interior lights do go one when the headlight switched in put in the on position.

I have tried:
1. Jumping the main headlight relay.
2. Testing the switch; Continuity across pins 16, 14 & 13 (I do not have continuity across pins 16 & 12 though which are labeled as having such when the switch is in Auto)
3. Checking all of the fuses.

Could this have anything to do with DRL system? or is that completely independent?

Is there any way for me to confirm that this is not the switch by bypassing/jumping it?

I have attached the page I have been using for reference.

Any help is appreciated.

 

Are the DRLs the (dimmed) high beams or the low beams?

 

The DRL's are the indicator Lamps. Not the Headlights.

 

Well then, have you checked the obvious? That is the bulbs or low beam filaments?

 

Yep, checked those too.

 

Okay, Now I am going crazy.

I have replaced the DRL relay, tried a replacement headlight switch, jumped the headlight relay in the fuse box under the hood, triple checked the fuses, triple checked the bulbs themselves.

What am I missing here?

Any help is appreciated in keeping me sane!!

Joel