Headlamp replacement How do I replace the headlamps on the cavalier?

Headlamps
The headlamps are operated when the driver places the headlamp switch in the HEADLAMP position. The LT HDLP and RT HDLP fuse in the IP fuse block, supply battery positive voltage to both the left and right headlamps. The low beam and high beam circuits continue to the headlamp switch. Depending on the position of the dimmer switch, either the low or high beam circuit will now have a path to ground. Ground is provided at G204. The low beam and high beam circuits also provide the body control module (BCM) with both low and high beam inputs. The headlamp switch includes the dimmer and the flash-to-pass switch.
If the headlight switch is left in the HEADLAMP position, the headlights will remain on until turned off or the battery runs dead.

The ground under the battery has nothing to do with the headlamps . G-204
G204
On the steering column support bracket

Just the low beams not working ??????
Headlamps Inoperative - Low Beams
Step
Action
Yes
No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics
1
Did you perform the Lighting System Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Place the headlamp switch in the HEADLAMP position.
Place the headlamp dimmer switch in the LOW position.
Do the low beam headlamps illuminate?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 5
NO - Go to Step 4
4
Replace the headlamp switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.
YES - Did you complete the replacement?
NO - Go to Step 5
--
5
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know

Learn how to test the electrical circuit's properly . Using a DVOM - digital volt ohm meter . An get yourself good factory service repair manual ,don't guess an think you know how to fix it.

You have two voltage sources for the headlamps. the right headlamp fuse and the headlamp circuit breaker, both hot all the time, when relay is not energized. Does that make sense? The top wires in diagram for headlamps is voltage. Use a test light to test. The bottom wires in the diagram from headlamp are grounds. Your headlamp and dimmer switch are on the ground circuit. Just between me and you, I don't like drl. Just my opinion.
If you have any questions, holler, on the comment link.

Get flat screwdriver and star screwdriver

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How to Adjust a Headlamp Beam on a 2005 Chevrolet Cavalier...

When you replace the headlamp assembly in the 2005 Chevrolet Cavalier, you must also adjust the headlamp beams. Like most vehicles, there are two screws located on the headlamp assembly that control the vertical and horizontal direction of the headlamps. Proper adjustment is necessary for adequate visibility during nighttime driving; bad adjustment can make it difficult for you to see or make it difficult for oncoming drivers to see, creating a potentially dangerous situation. You can adjust the headlamp beams yourself with a screwdriver in about 15 minutes.
Park the Chevrolet Cavalier on a flat surface facing a wall or garage door approximately 15 feet away. Park the Car so that it is perpendicular to the wall.

Lift the hood and remove the plastic trim panel above each of the headlights. There are three plastic fasteners that secure the trim panel; pry the fasteners out using a flathead screwdriver. Lift the trim panel up to remove. There are two adjusting screws beneath the trim panel, one on the top of the headlamp assembly and one along the outer side of the headlamp assembly.

Turn the headlights on so that they shine on the wall. Ensure the headlights are on the "dim" setting.

Adjust the vertical bolt, located on the top of the headlight assembly near the center of the vehicle to raise or lower the headlight, using a crosspoint screwdriver. Turn the screw counterclockwise to lower the headlamp beam; turn the screw clockwise to raise the headlamp beam. Adjust the headlamp so that the beam is below a driver's eye level.

Adjust the horizontal bolt, located on the outer side of the headlamp assembly to move the headlamp beam right of left, using a crosspoint screwdriver. Turn the screw counterclockwise to move the headlamp beam right; turn the screw clockwise to turn the beam left. Adjust the headlamp so that the beam shines straight ahead or slightly toward the center of the vehicle.

Replace the plastic trim panel and fasteners and close the hood. Warning: raising the lights too high can make it difficult for other drivers to see you.

Hi Carol , your going to have to remove the headlamp assembly to replace the bulb !


Remove the headlamp assembly. Refer to Headlamp Replacement.



1



Headlamp Bulb Accessory Covers (Qty: 2)



2



Headlamp Bulb Assembly (High Beam)




Caution: Refer to Halogen Bulb Caution in the Preface section.




Tip

Disconnect the electrical connectors and remove the bulbs.



3



Headlamp Bulb Assembly (Low Beam)


Callout

Component Name

Preliminary Procedure

Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement .




Headlamp Assembly Bolt (Qty: 4)

Notice: Refer to Fastener Notice in the Preface section.

Tighten

6 N?·m (53 lb in)







2





Headlamp Fascia Brace Fender Reinforcement Bolt




Tighten

6 N?·m (53 lb in)







3





Headlamp Cam Adjuster




Procedure

Set the headlamp adjusters at the nominal setting of 6 turns off fully seated.







4





Headlamp Cam Locking Nut







5





Headlamp Assembly




Tip

Disconnect the electrical harness as the headlamp assembly is being removed from the vehicle.

Here is a link to the wiring diagrams for most vehicles http://bbbind.com/free_tsb.html

1. Loosen only, do not remove, the lower outside hidden headlamp bolt (2). 2. Depress the housing support tab with a flat-bladed tool downward in order to release the headlamp assembly from the support. 3. Pull the lamp assembly slightly forward to access the electrical connection. 4. Disconnect the forward lamp harness main electrical connector from the headlamp harness.
Headlamp Screws (Qty: 2)
1 Caution: Refer to Fastener Caution .
6 Nm (53 lb in)
O Headlamp Screw (Hidden)
6 Nm (53 lb in)
3 Headlamp Housing Support


Preliminary Procedure Remove Healamp
Remove either the LF or RF headlamp assembly. Refer to Headlamp Replacement (Chevrolet) Headlamp Replacement (GMC HD)
Headlamp Replacement (HD Diesel).
Headlamp Bulb (Hi)
Warning: Refer to Haiogen Bulb Warning .
Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the bulb from the headlamp.
Headlamp Bulb (Lo)
Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the bulb from the headlamp.

Need more come to https://www.autorepairhelp.us

remove the mounting screw on the lens, then remove the top 2 bolts holding the headlamp, pull headlamp out to gain access to the mounting nut on the turn signal. Remove the nut and the turn signal light will pull straight out allowing you to replace the bulb.

Removal & Installation To Remove:

1. Remove or disconnect the following:
   • Hood close out filler panel.
   • Bolts from the headlamp.
   • Headlamp from the headlamp mounting panel.
   • Electrical connector from the headlamp.
   • Headlamp bulb/socket retainer ring from the headlamp.

Headlamp bulb/socket from the headlamp.

Bolts from the headlamp adjuster mechanism.

Headlamp adjuster mechanism.

To Install:

1. Install or connect the following:
   • Headlamp bulb/socket to the headlamp.
   • Headlamp bulb/socket retainer ring to the headlamp.
   • Headlamp adjuster mechanism to the headlamp housing, if necessary
   • Bolts to the headlamp adjuster mechanism. Tighten to 6 N.m (53 lb in).
   • Electrical connector to the headlamp.
   • Headlamp to the headlamp mounting panel and lower mounting bracket.
   • Bolts to the headlamp. Tighten to 10 N.m (89 lb in ).
   • Hood close out filler panel.

I would check the voltage at the battery while the engine is running. If over 15 volts , your voltage regulator is shot , and your headlights cooked.

If that is problem , alternator will have to be replaced.

could be or it could be the the relay for thr day time lights