Question about 2004 Chevrolet TrailBlazer

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How do u replace the headlamps.i dont want to brake something trying to get them out

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Open the hood then you need to remove the grill assembly it just snaps off. once grill assembly is off then the headlight assemblies are locked in with four metal clips, two per light.they just lift upwards to unlock the lights. now pull out assemblies and take off rubber discs to reviel the light bulbs

Posted on Oct 08, 2009

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Remove the turn signals using a philips screw driver. this will expose 2 bolts that have to be removed (they bolt in using a flange from the headlight DONT remove the bolts in the plastic bezil behind the headlight) after you remove the 2 bolts the headlight has 2 tabs that rock into the grill, just remove the side you pulled the bolts from first then rock the other side out of the grill...Then you remove your headlight from the lamp by turning the harness 1/4 turn (left or right depending on side) and remove the bulb. Installation is reverse from this

Posted on Oct 08, 2009

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Posted on Jan 02, 2017

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My brake lights dont work most of the time, they illuminate when it wants to, intermittently, i have a 2004 Buick rainier, also my headlights work fine during the day, but at night when they want to.


Do you know anything about automotive electrical circuit testing ? Using voltage drop testing to find which part of the circuit has the problem , Voltage or ground side ? There is no common problem with both of these systems. After looking at a wiring diagram ,they have different grounds an B+ voltage supply's .
The STOP fuse in the engine wiring harness junction block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the VEHICLE STOP fuse and the VEHICLE CHMSL fuse. The current flow is now to the stop lamps which are grounded at G401 and G402. The center high mounted stop lamp (CHMSL) is grounded at G401.
For trailer wiring, a separate stop lamp circuit is connected through the GMSF to the trailer wiring harness.

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 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.

DTC B2575
When the BCM receives a ground signal from the headlamp switch requesting the low beam headlamps, the BCM will energize the HDM low beam relay by grounding the low beam relay control circuit.
For the brake light problem ,without testing , i would say there is a ground problem . Voltage drop testing the circuit would show what is wrong.


Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
How to Use Multimeter to Troubleshoot Common Problems

Do you know what a wiring diagram is ? You need to look at one to see which wires to test . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year,make , model ,engine ! Under system click on lighting ,under subsystem click on exterior lighting . Click the search button ,then the blue links ! The fourth one down is the brake lights . You see the fuse's for the brake lights in the rear fuse box ? Do you know where that is located ? Fuse Block - Rear
Beneath the left rear seat.
Know as for your headlamps , probably the headlamp driver module is bad ! The headlamp switch is a input to the BCM - body control module . Hooking up a factory scan tool to view DTC'S - diagnostic trouble codes , an view input data to the BCM . To see if it is getting the signal to turn on the headlamps an see if it send PWM signal to the HDM .
Your best bet ,take it to the dealer .


Jun 29, 2017 | Buick Cars & Trucks

1 Answer

Why does my 1999 chevy malibu headlights turn on by them self in middle of night


You have a gremlin ! No , just kidding . No it's not the ignition switch ! The headlamps right an left have there own fuse in the under hood fuse box . LH HDLP - RH HDLP . Power direct to the head lamps an they ground through the headlamp switch when placed in high or low beams . Next time they come on wiggle the headlamp switch an see if they go out ! Does your vehicle have auto lights ? Day time running lamps ? The BCM - body control module controls Automatic lamp control !
Battery voltage is applied to the headlamp bulbs at all times. The headlamps are controlled by supplying the ground for the lamps through the turn/headlamp switch assembly or the body control module (BCM). When the turn/headlamp switch is in the ON position, the ground is supplied through CKT 150.
The BCM controls the daytime running lamps (DRL). The system allows the headlamps to operate at a reduced intensity under the following conditions:
?€¢
The engine is running.


?€¢
The transaxle is not in the PARK position.


?€¢
The normal headlamps are turned OFF.

The BCM activates the system by grounding CKT 592. This action energizes the DRL relay. This condition allows a reduced voltage to flow to the headlamps. When the headlamp switch is turned to ON, the headlamps operate normally.
The parking brake provides an input to the BCM. When the parking brake is engaged, the DRL remain disabled until the parking brake is disengaged.

May 30, 2015 | 1999 Chevrolet Malibu

1 Answer

Chrysler Sebring 2008 headlight assembly removal


some times headlamp units have a plastic retaining clip on the underside of headlamp, does the headlight move from side to side? try to pull the headlight back from the top of unit then lift up the headlamp unit, if not it could be the headlamp adjusters holding unit in place.

Dec 06, 2013 | 2008 Chrysler Sebring

1 Answer

1997 ford contour tail lights won't work but brake lights do already changed bulbs what fuse is for parking light


There are 2 fuses,left and right, so I dont think both could be out? fuses. 33 and 35. make sure they have power on both sides of the fuse. If one side has power, its blown, if no power, the headlamp switch is bad, or bad connection. The RED/BLACK wires coming out of the headlamp switch go to those fuses. 33-35

Dec 10, 2010 | 1997 Ford Contour

1 Answer

Trying to replace the brake lights in my Ford


revove the plastic nuts, doesn't hurt to try,

May 08, 2010 | 2005 Ford Escape

1 Answer

I have 2008 yukon. i have replaced 7 headlamps


Check the plug ins. Than check the light bulbs and see if they are melted If that is the case than you have to find the bad wires eather way it has something to do with your wires

Apr 20, 2010 | 2001 GMC Yukon Denali

1 Answer

Brake lights not working (goes out) when headlights is turn-on. tail lights bulbs replace, brake switch appears to working otherwise.


would appear as if the lamp switch is bad or you have something crossed but i am leaning towards the headlamp switch

Sep 12, 2009 | Jeep Cherokee Cars & Trucks

2 Answers

Brake light dont work


check the fuse for the brake lights. The brake lights and siganl lights use the same bulb filament. The parking and running lights use a dimmer filament in the bulb. There are 2 filaments.
Your brake lights work through the multifunction switch which operates the signal lights. If the signal lights work, you may have a bad brake lamp switch which is on your brake pedal arm.
Let us know what you find.

Mar 20, 2009 | 1998 Lincoln Town Car

1 Answer

Headlights don't work after replacing brake lights


check the power with a meter at the lights,no power a supply voltage fault,battery voltage at the plug ...new bulbs needed

Jan 19, 2009 | 2001 Volkswagen Golf

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