Headlights dont work on my 03 cavalier

bad connection or bad earth check all connection or bulb

I think you just need new bulbs in both sides. The High and low beam are in one bulb.

Ok good luck

it may be the dimmer switch located on the base of the steering colume that is not working on the low beam side.also the headlights themselves may need changing if the low beam filament is burnt out and you didn`t realize one was burnt out then the other one burnt out.if that`s not the case then it could be a bad connection at the plug connector for the low beam or for some reason power is lost between the switch and the headlight.you don`t say if this has day time running lights,if it does then it could be the drl relay that is bad.

The blinking light is telling you that you have a headlight out, if you look the service light should be coming on when the light stops blinking.
Replace the head light and all should be fine.

just replace the dimmer switch under the column its wore out on the low beam side

dont replace the bulbs ...check the fuses first...each circuit has its own independent fuse...one for low beam one for high beam and a separate low voltage one for running lights...you may have 1 bad bulb at very worst that could have blown the fuse...why spend extra money on 2

hi the problem is the forward light harness there are broken wires
under the hood left side about middle of the transmission on the body rail there is a black connector with about 10-15 wires diconnect it then there is a ground wire by the battery with a 10mm bolt remove then remove the left headlight then you will see the washer bottle there are 2 10mm bolts that hold the washer bottle the harness goes between the washer bottle and the body remove the bolts then very carefully pry the bottle towards the left front tire enough to pull the harness up then remove the tape and u will find most likely green powder like substance that is corroision and there will be your problem also stripp the harness all the way to the right till the relay that is in the middle of the bumper and repair all the wire spices that is 2 or 3 wires into one i use BLUE heat shirnk **** connectors then tape the harness back together and reassemble ps. your can buy the harness from a GM dealer if you want also hope this helps you

replace the headlight bulbs. Usually when the bulbs blow out the low beam blows out first, but the high beams still work. If you want and need both low and high beams to work then replace the headlight bulbs with brand new ones and I garauntee that both low and high beams will work

possibly head lamp switch. daytime running lights on separate circuit and use the high beams at reduced voltage. does flash to pass work? that's high beams too. do high beams work?

Is it just low beams?
do taillights work?