Question about 2002 GMC Envoy

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I have a 2002 envoy slt my daytime running lights just went out all other lights works ckd bulbs fuses and relay they all seem good dimmer switch appears to be good what else can i ck or what could problem be

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Their is a photo light sensor someware on the top of you dashboard or on backside of rearview mirror that has been covered possibly dash mat ? something hung on your rearview mirror.let me know.

Posted on Mar 22, 2011

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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

3 Answers

Headlights won't work on my 04 Aztek, checked fuses, relays and bulbs. All are good, only the fog lights and daytime running lights will come on.


as you checked already fuses, relays and bulbs there must be something wrong with the light switch in the dashboard.
- either a loose connector or worn out contacts. first remove the switch and spray some WD-40 or similar contact spray into the connector from behind - if that does not help you have to replace the light switch with a new one...
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Feb 06, 2015 | 2004 Pontiac Aztek

1 Answer

I have no low beam headlights. already checked bulbs, fuses, relay and dimmer switch. can you help?


Before you replace the #46 HDM relay (in the fuse block under the hood) try exchanging it with the #45 cooling fan relay and see if your low beam lights work. If they do, the HDM relay (actually solid state module, not a relay) is bad.

Jul 30, 2014 | 2004 GMC Envoy

2 Answers

Headlights not working


Do you have power in and out of the dimmer switch on the low beam circuit ?

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Headlights dont work 2002 chevy caverlier


Lamps do not light, check whether the light bulb burned, second, take a look at the lamp is plugged in firmly, 3, check the line and the fuse
maybe you need :auto diagnostic tool

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3 Answers

Low Beems are out. I changed both bulbs and the


DIMMER SWITCH OUT OF ADJUSTMENT.I SEEN CAR WITH SAME PROBLEM THEIR HIGH BEAMS WOULDNT WORK.THE DIMMER SWITCH AND BULBS WAS GOOD.IT TURNED OUT TO BE DIMMER SWITCH NEED TO ADJUSTED.

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No low beam lights or daytime lights - high beams work


both low beam ights wont work on my VW 2000 beetle I have checked the fuses, bulbs, and relays what could be the problem

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1 Answer

2002 Toyota Camry daytime running lights don't come on. Fuse and relays have been switched around and seem to be operational. Everything else works fine


Check to see that each bulb in the daytime running light circuit works, replace as required. Good luck, Jim

Oct 02, 2009 | 2002 Toyota Camry

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