Question about 2008 Hummer H3

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When I activate the high-intensity headlights, the light beam is projected extols the vehicle and when I use the low-intensity headlights, the light beam is projected away. Is it possible that the wire be reversed. Is it possible to get the wiring diagram and color codes for electrical wiring headlights for 2008 Hummer H3 so I checked if they are properly connected

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  • Hummer Master
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Not the wiring here thats at fault i think but the bulbs are loose or fitted in the wrong way around

Posted on Mar 12, 2011

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Posted on Jan 02, 2017

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Dim on headlight not working, changed fuse,bulb,relay 15016745,and bulb connector,still want work-2002 trailblazer


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

Aug 27, 2017 | Cars & Trucks

2 Answers

Headlight low beam on my envoy 2006 not working


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 and the park brake switch as inputs. In general, the HDM will operate in 1 of 3 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: 85% 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 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.

The normal battery voltage input to the HDM must be between 6 and 16 volts DC to operate. Any deviation to these values could cause improper operation.
Major components of this system are the BCM, HDM, ambient light sensor, multifunction switch, park brake switch and low beam headlamps.
DTC B2575 Headlamp Control Circuit
When the body control module (BCM) senses a request for headlamp or daytime running lamp (DRL) illumination, the BCM sends a pulse width modulated (PWM) ground signal to the low beam headlamp driver module through the low beam headlamp driver module control circuit. The low beam headlamp driver module will illuminate the headlamps, adjusting the intensity based on the PWM signal received
You best bet is to take your vehicle to a ASE certified repair shop or the dealer >

Jan 15, 2016 | GMC Envoy Cars & Trucks

2 Answers

What would cause the low beam headlight not to work when all other lights work?


If you have standard halogen bulbs:

  1. Burned out light bulb; or
  2. Fried wires between the dashboard wiring harness and the headlight bulb connectors; or
  3. Fried headlight bulb connectors.
If you have HEI emitters:
  • Failed ballast.

May 11, 2015 | 2002 Mercury Grand Marquis

1 Answer

2007 envoy the headlights on dim are not working


Did you check the fuse's an HDM relay #46 in the under hood fuse / relay box ?
Headlamps
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 lamp intensity using the ambient light sensor, multifunction switch and the park brake switch as inputs. In general, the HDM will operate in 1 of 3 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: 85% 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 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.

Mar 16, 2015 | 2007 GMC Envoy SLT

2 Answers

2003 GMC Envoy low beam head lights will not come on. The bulbs are not blown, fuse's ok, no power coming to the head light connector. minimal power to the fuse compartment with fuse removed. 9 to 10...


The problem is a Headlight module. Fuse box under the hood has two black modules side by side, the one on your right is the headlight module the one on the left is the fan module. Try swapping them, if the headlights work replace bad module, don't drive vehicle with the bad module in the fan slot. Mine kept going bad because I had a high intensity bulb on one side.

Oct 02, 2011 | 2003 GMC Envoy

1 Answer

93 Golf VR6, headlight high and low beams are very


Did you check battery charge.Must be 13.8 v-14.4v.Or your battery is gone.

May 12, 2010 | Cars & Trucks

1 Answer

How do you adjust headlights on a 1993 chevy C1500


if you look at the light, there is an adjustment screw at the top of the light that controls the up and down motion , clockwise will raise the beam, and a screw on the side that controls the side to side motion. the best way to center your lights would be to park the vehicle 25 feet away from a verticle wall. be sure to be very square to the wall and on level ground. make a tape line vertically on the wall in very close relation to the center of the vehicle, and another tape line vertically in very close relation to the center of each headlight. now place a tape line horizontally in very close relation to the center of the headlights. start with low beam adjustment. adjust the high intensity zone to 2 inches below the horizontal line and 2 inches to the inside of the vertical line directly in front of the headlight. for high beam adjustment, adjust so that the high intensity zone is centered on the center vertical line and just below the horizontal line. hope this helps

Apr 04, 2010 | 1993 Chevrolet C1500

1 Answer

Trying to adjust head lamp in a 1995 chevy C1500 just had to buy a new lamp assembly


if you look at the light, there is an adjustment screw at the top of the light that controls the up and down motion , clockwise will raise the beam, and a screw on the side that controls the side to side motion. the best way to center your lights would be to park the vehicle 25 feet away from a verticle wall. be sure to be very square to the wall and on level ground. make a tape line vertically on the wall in very close relation to the center of the vehicle, and another tape line vertically in very close relation to the center of each headlight. now place a tape line horizontally in very close relation to the center of the headlights. start with low beam adjustment. adjust the high intensity zone to 2 inches below the horizontal line and 2 inches to the inside of the vertical line directly in front of the headlight. for high beam adjustment, adjust so that the high intensity zone is centered on the center vertical line and just below the horizontal line. hope this helps

Oct 20, 2009 | 1994 Chevrolet C1500

1 Answer

Volvo 940 headlights


dim lights are generally bad ground / rusty -loose ground points or wires

Jul 18, 2017 | 1994 Volvo 940

1 Answer

Adjusting Headlamps


I have an 87 MR2 and this is how to adjust mine. Headlights have two spring loaded adjusting screws, one on the top controlling up and down movement and one on the side controlling left and right movement. The simplest method requires a blank wall 25 feet in front of the vehicle and a level floor. Position masking tape vertically on the wall in reference to the vehicle centerline and the centerlines of both headlights. NOTE: It may be easier to position the tape on the wall with the vehicle parked only a few inches away. Adjustment should be made with the vehicle sitting level. Starting with the low beam adjustment, position the high intensity zone so it is 2 inches below the horizontal line and 2 inches to the right of the headlight vertical line. Adjustment is made by turning the top adjusting screw clockwise to raise the beam and counterclockwise to lower the beam. The adjusting screw on the side should be used in the same manner to move the bean left or right. With the high beams on, the high intensity zone should be vertically centered with the exact center just below the horizontal line. NOTE: It may not be possible to position the headlight aim exactly for both high and low beams. If a compromise must be used, keep in mind that the low beams are the most used and have the greatest effect on driver safety. I typed this out of my "Haynes Manual 1985-1987 Toyota MR2 Book. I would think it would be the same method for a 1989 also. Hope this helps you. Redheadedwop

Sep 10, 2008 | 1987 Toyota MR2

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