2000 Toyota Echo. No low beams. changed dimmer switch. old one had burnt spot on low beam hot/ground wire. Where is Headlight relay with no DRL?? if i ground blk/wht wire low beams will work. both bulbs good, and also both 10 amp fuses. Im stumped.
There should be separate relays for your headlights inside the fuse panel under the hood drivers side fender
SOURCE: 2006 Toyota Camry....headlights will not come on;
there was a recall on the headlight switch up to 06 camrys,find out if your car is affected by calling Toyota with the chassis no,and month of build
SOURCE: How do you change the headlight bulb (low beam) on
You should be able to access the buld holder from the rear of the headlight. It's a nylon bulb holder with a lock thing on it. You squeeze the lock part and turn it counterclock wise, and it should come out. Remove the old bulb and install the new one being careful not to touch the glass of the new bulb with bare fingers. The finger print you will leave can cause the bulb to prematurely die on you.
SOURCE: low beam drivers side doesn't light; high beam
Looking at the diagram, you dont say if you car has Daytime Running lights or not. The Black/White wire is gounded to make the low beam work. Ground that wire to confirm if the socket and bulb is good. If you ground the wire and the bulb works, there is a juntion block where the wire turns frm Black/white to Red/blue but I donr know how to tell you where it is. The headlight switch may be bad.
SOURCE: 1998 toyota rav 4. right side low beam headlight
sounds like there is a broken wire. the only advise i can give you is to follow the hot wire for that light untill you find the break in the wire.
SOURCE: headlighbeamt cannot work on high beam
It could be in the switch for the low and high beam's
this is the main light diagram Low beam 
this is the diagram for the daytime running lights. 
hope this helps... there have bee a few reported problems with the radio blowing and then the light go out if the radio is fine it could be a fault with the LED control relay if this blows it can blow the 10amp fuse for the lights. you need to get the right relay as there are two types touch and none touch. tast one this is were all the units are 
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