Try checking the basics first. Get a good close look at all the connections to see if they're corroded or dirty. Next, where you can follow the wires from end to end to look for nips, cuts and breaks. Check inside the head lamp and check for condensation. There is a relay in the circuit as well which switches from low to high beam. Get this checked as well. Might be worth just replacing it as they aren't that expensive.
SOURCE: 1998 Chevy Cavalier Z24 left rear brake/turn lamps will not work
Sometimes even a new bulb will not work. If you have a Digital Multi Meter you can check that you have power going to the rear. I know that sometimes when a vehicle loses a bulb in one end that it can make the other end stop working. With that said, I suggest that you double check to see that the front works. I used to own a 98 Cavalier RS with the 2.2 liter motor and I know that there are fuses under the hood and behind a little door on the drivers side in the car. Might check fuses under the hood also.
SOURCE: How do I replace a headlight bulb for a 2004 chevy
Change headlights in 2004 Chevy Malibu Classic
Open the hood and pull up on the two black tabs on either side of the lamp assembly. Pull the lamp assembly forward gently and unclip the wiring harness. Twist the socket counter-clockwise and remove it. The bulb should be removed by wiggling it.
Install new bulb in its place and turn the socket back into place. Reconnect the wiring harness and return the lamp to its original position. Line up the holes in the lamp assembly to the round ends of the mounting pins, and press down on the two black tabs to hook the lamp assembly into place.
SOURCE: Brake lights don't work. Replaced bulbs, checked
Yes, you need to of course check the voltage coming into and going out of the brake light switch, if 12 Volts are there going out and coming in while pressing on the brake pedal, your brake lights aren't getting a good ground or there is a break in the circuit between that switch & the lights.
On occasion the tail lights will work with a weak ground circuit where the Brake lights won't. Best way to determine this is to just hook up the 12 volt tester to the Brake light hot wire & there at the bulb ground, then in an area away from the bulb that has a good possibility of contact/ground.
Really that's it, if the 12Volts is getting to the bulb but it isn't lighting, if you aren't getting the voltage there and the brake switch is hot on both sides when pressed, the break in voltage will have to be traced from that switch to the tail light to find the problem.
good luck.
SOURCE: i only have high beam headlights
about troubleshooting your headlights on your vehicle. I would isolate the wire that comes from the headlight switch to the headlamp bulbs for low beam and check to see if there is a short in the wire. You can find this wire by using a test light turn on the key and get a good ground with the test light poke the wire and see if the test light illuminates with the headlight switch on.
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Also check the wires, and check the fuse for your low beams. could of blown a fuse on your lows, but your highs will still work.
Every single time I have had a failure of low beam in a headlight without failure of high beam, it has been because the lamp bulb or halogen lamp module has reached the end of its serviceable life, not because of any wiring problems. Low beam burns out first because it is on the most. If low beam is lost simultaneously in both headlights, I would check fuse first, then the headlight switch. If low beam is lost on one side only, it is almost always going to be due to the bulb or lamp module needing to be replaced. In that case, replace them in both headlights because the other one will be going kaput in short order, as well.
There is something to check. Does the low beam relay click when you turnt he low beams on?
if it does not click then
Then find the BCM at the base of the steering column. In there find the grey connector and in there, find the pink/white wire in terminal A4. Use a wire to jump that wire to ground. IF the low beams come on, then it is likely the BCM is bad.
Also check a bad wire between the fuse block and the BCM. before replacing the BCM . Start under the fuse block. This is the fuse block under the hood.
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SOURCE: Brakes Lights dont work on a 2006 Chevy Silverado
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
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