One filament in the headlamp bulb.

[ellenbetty]

Am I missing some detail about the Yaris headlamp bulb? On-line I was looking at different Yaris headlamp bulbs. The headlamp bulb is listed as 65/55W. But all I could see in the clear headlamp bulbs is just one filiment. :thumbdown: It looks like the Yaris uses resistors and/or relays to create high beam, low beam and daytime running lights. If I am right, when the DRL burns out the filiament in the headlight bulb, you need to replace the headlamp bulb before dark (or have fog lamps as a backup plan) to avoid driving a one eyed monster.

[RedRide]

The yaris uses a 9003/H4 bulb with two filiments.

The DRL uses the low beam (at lower voltage) so, yeah if you loose a DR, replace the bulb ASAP.

[goku87]

one of my headlights looks sad. is this why? one of the filaments died?

[IllusionX]

yeppers, you will not see the 2nd filament by looking through the headlight assembly.

Also, if one of your headlight look very DIM compared to the other, you could have a bad ground somewhere... check all your wiring.

[Yaris Hilton]

When a headlight does need replacing, it's best done in matching pairs. Replace one, and the two will probably not appear the same color and brightness.

[RedRide]

Also, once one goes, the other is living on borrowed time.

[ellenbetty]

Found this at Candle Power Inc. Diagram shows 2 filaments. Front filament for high beam. Rear filament for low beam. Not the best diagram.

[RedRide]

Interesting read. The PDF explains the "difference" between a 9003 and H4 and clears that up.