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are you in USA.?
are you in Canada with mandatory DRL lighting?
we can not guess that,
DRL car is complex.
DRL has a 20 pin module just for DRL, crazy complex.
the FLASH on DRL grounds the HL directly bypassing DRL relay
so is super important the FLASH test.
There are 2 systems used, the toyota uses hot all time headlights
(via the HL relay and dimmer relay)
I need this?
is it dim on high, yes,
is it dim on low, no.
is it dim , when you push the lever to FLASH.??????
if flash works we know why it fails. see? (paths)
if high beams and FLASH are dim, then DRL relay bad.
(can be other failures., for sure even wires bad)
its just a:
Toyota Corolla. Gen 6 to 8. (in snake skins)
if you have voltmeter this is child's play , really
finding point of voltage drop tells you what is wrong
find a shop with sparks guy? be best or by a meter and learn>?
guessing can take a long long weekend.
is labor time not a matter to you or down time?
ok I pulled up your cars HL schematic.
DRL is super complex
id pull the DRL module and look for burned pins
they love to do that DRL does.
so got DRL
and does FLASH work right>?
It sounds like the battery has just enough "juice" to give the small light some power, but when the larger light is turned on it overloads the bad (or expired) battery. When you put a new battery in you can extend the life by not using the light when the battery starts to die. This is when it starts to permanently damage the battery. Turn it off and recharge as soon as it dims. Charge often, but don't leave on the charger too long unless it is a smart charger and turns off when the battery is fully charged. This will also reduce the life. You can find a replacement battery here: http://batteryinternational.com/spotlight-batteries-vector-battery.html
If only the headlights are dull and not putting out the correct light, I would suspect a bad ground (earth) connection somewhere in the headlight circuit or the fuse for the headlight circuit. Something is causing excessive resistance and causing less voltage to be provided for the headlights. If all the lights are dimly lit, then I would check the charging system, the battery and the ground cable for the battery, chassis, and engine.