How to install headlamp on a 2002 chevy trailblazer

wow no year car told,why? 1998 to now, is it USA? car?
yes sold in S.America too, 2011 and up.
the outside casing lens?
the service manual covers this only
no problem told at all just how to. ( so I guess the whole thing out and in)
why skip saying the problem first.? to the blind.
is the front of the light casing all ugly and yellow?
2001-2008 (separate model, North America)
so I guess 2003, ( using ESP and Karnac mind meld)

replacing all this.??????

https://www.rockauto.com/en/catalog/chevrolet,2003,trailblazer,4.2l+l6,1412277,body+&+lamp+assembly,headlamp+assembly,10762

PULL steps

Headlamp Replacement (TrailBlazer) Removal Procedure

1. Open and support the hood.
2. Remove the grille. Refer to ' Grille Replacement (Chevrolet).
3. Use a flat-bladed tool in order to release the clips that retain the grille to the headlamp panel.
4. Remove the grille from the vehicle.
5. Pull up on the retaining tabs?(1) in order to remove the headlamp assembly from the headlamp panel.
6. Disconnect the headlamp leveling electrical connector from the motor/actuator if equipped.
7. Disconnect the headlamp electrical connector?(2) from the headlamp assembly.
8. Remove the side marker socket?(4) from the headlamp assembly.
9. Remove the park/turn socket?(3) from the headlamp assembly.
10. Remove the headlamp assembly from the headlamp panel.

if confused buy the service manual
or get the car serviced in real shop.

Low beam's don't work , how about high beams . Low beam relay is turned on by the BCM - body control module , headlamp switch is a input to the BCM . Your best bet mite be to take it to a qualified repair shop , rather then guessing an replacing parts you don't need . Hooking up a scan tool an checking for DTC'S - diagnostic trouble codes should have been the first step before replacing parts .
The headlamp driver module (HDM) is an electronic module that provides electrical power to the vehicle low beam headlamps. The HDM is controlled by a pulse width modulated (PWM) ground signal from the body control module (BCM). The BCM determines the desired lamp intensity using the ambient light sensor, multifunction switch , wiper motor, and the park brake switch as inputs. In general, the HDM will operate in one of three modes:
• Reduced Intensity Mode: This mode is used by features that do not require or allow maximum low beam headlamp intensity such as daytime running lights (DRL) (nominal: 81% duty cycle).
• Full Intensity Mode: This mode is used by features that require full low beam headlamp intensity such as low beam headlamp operation in manual, wiper activated headlamp (WAH), or auto modes (nominal: 100% duty cycle).
• Off Mode: This is the default mode of the system that will occur when none of the features described above are active. The BCM will deactivate its PWM output (0% duty cycle) during this mode.

Chevy Trailblazer headlights don work HDM input output testing YouTube

2005 TrailBlazer Clacking and Clunking From Rear End ...

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https://www.youtube.com/watch?v=HIA151KxImM
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https://www.youtube.com/watch?v=GLhTUoHWdNM
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There should be a relay for the low beams. Locate and replace, Or swap it with another relay to see if that fixes the problem.

Headlamp Removal & Installation Bulb Replacement To Remove:
CAUTION
Halogen bulbs contain pressurized gas. Mishandling a bulb may result in the bulb shattering into flying glass fragments.
CAUTION
Make sure to wear eye protection when handling a halogen bulb.
CAUTION
Do not touch the glass of a halogen bulb, only handle the bulb by the base.
CAUTION
Do not allow a halogen bulb to come into contact with dirt or moisture.
CAUTION
Make sure to dispose of a used halogen bulb properly.
CAUTION
Do not allow children to handle halogen bulbs.

1. Turn the lamp switch to the off position.
2. Make sure the bulb is cool before changing.
3. Remove the headlamp assembly from the headlamp panel.
4. Remove the rear access cover from the headlamp assembly.
5. Disconnect the headlamp connector.
6. Remove the bulb from the headlamp assembly by rotating the bulb and socket counterclockwise.

To Install:

1. Connect the headlamp connector.
2. Install the bulb into the headlamp assembly by rotating the bulb and socket clockwise.
3. Install the rear access cover onto the headlamp assembly.
4. Install the headlamp assembly into the headlamp panel.

Headlamp Assembly Chevrolet To Remove:
Headlamp Assembly (Chevrolet)

1. Remove the grille from the front of the vehicle.
2. Release the headlamp assembly retaining tabs.
3. If equipped, disconnect the headlamp leveling motor connector.
4. Disconnect the headlamp connector.
5. Remove the park/turn and side marker bulb sockets from the headlamp assembly.
6. Remove the headlamp assembly from the headlamp panel.

To Install:

1. Place the headlamp assembly into the headlamp panel.
2. Install the park/turn and side marker bulb sockets into the headlamp assembly.
3. Connect the headlamp connector.
4. If equipped, connect the headlamp leveling motor connector.
5. Lock the headlamp assembly retaining tabs.
6. Install the grille onto the front of the vehicle.

1. Open and support the hood.Remove the grille.
2. Pull up on the retaining tabs (1) in order to remove the headlamp assembly from the headlamp panel.
3. Disconnect the headlamp leveling electrical connector from the motor/actuator if equipped.
4. Disconnect the headlamp electrical connector (2) from the headlamp assembly.
5. Remove the side marker socket (4) from the headlamp assembly.
6. Remove the park/turn socket (3) from the headlamp assembly.
7. Remove the headlamp assembly from the headlamp panel.
8. Installation:
   
9. Position the headlamp assembly to the headlamp panel
10. Index and seat the tabs on the park/turn socket (3) to the headlamp assembly.
11. Index and seat the tabs on the side marker socket (4) to the headlamp assembly.
12. Connect the headlamp electrical connector (2).
13. Connect the headlamp leveling electrical connector to the motor/actuator if equipped.
14. Align and install the 4 locator pins on the back of the headlamp assembly into the retaining tab holes.
15. Push down on the retaining tabs (1) in order to lock the headlamp assembly into the headlamp panel.
16. Install the grille. Refer to Grille Replacement .
17. Close the hood

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.

hi my name is Alex the way you could change the light bulb when you open the hood on the front of the car you look behind of the light bulb and there is a latch that you pull up and the whole bulb comes out and from there you will be able to change your bulb. and after your finished with the bulb putting it back in you will have to level it out OK ? i hope this will be in be enough helpful information

your pigtail to the headlight might be burnt. I had the sme trouble on mine. Dealer sells them for about 30.00

if both lamps dont work a common problem was the headlamp module. It looks like a black relay in the underhood fuse block (next to the master cylinder), there is two black small relays right next to each other (they used to say 15016745 on top in white letters.) One is for the low beams and one is for the fan clutch. Swap them and check the lamps - if the come on, go get a new one at the dealer and replace the bad one. If you leave the bad one in the fan clutch your gas mileage will be bad and your ses light will come on.