low beam light problem.

[bonujj]

Hi everyone.. i have a 99 corolla with left side low beam problem. it switches to high beam but no low beam .other side works fine.checked bulb.fuse.has 12 volts at plug when on high beam zero on low beam.changed plug too. could it be low beam relay/ or DRL causing it.if its left side relay where is it located.i am not sure.. appreciate any help on this one. thanks...

[TiloToy]

I don't know my (just-puchased) Corolla yet, but all other Toys (and most Jap cars) I've worked "backward"- they switch ground to the headlamps to control them; the 12v battery is supplied full-time via a relay, to the "ground" or common contact on the H4 bulb (in your case). Probably switched from 9-12v by the DRL controller if you have that. You likely need to see if the ground moves from hi to low filament as is proper. Someone will have to provide you a quick shot of the wiring diagram. I have manuals on order, so no diagram yet.

[bonujj]

Took me awhile just got this thing working..again..thanks alot for your help.