Headlights are Possessed - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 04-29-2018, 05:08 PM
drhode drhode is offline
Junior Member
2002 Chevy TrailBlazer LT EXT
Black 4.2L I6 4X4
Join Date: May 2014
Location: Coalinga,CA
Posts: 3
Headlights are Possessed

I have a 2002 Trailblazer that while sitting in the garage not running, no keys in the ignition the headlights will come on and stay on for a while and then turn off for awhile and then come back on for awhile. This last time I pushed the high beam lever forward and back again and they went out, no sure if it was a coincidence, while driving yesterday the dash lights went out for awhile and then back on, not sure if I did anything by turning headlight switch on and off, it seems to be a relay thing but don't know where to look, has anyone experienced this same issue?
Thanks everyone!!!

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Old 05-02-2018, 04:26 PM
vipergg's Avatar
vipergg vipergg is offline
Senior Member
2008 Isuzu Ascender
Midnight Metallic 4.2L I6 2WD
Join Date: Mar 2007
Location: Rochester,NY
Posts: 915
Sounds like the headlamp driver relay , it's in the fuse box under the hood and are known to have issues in these vehicles .
2008 Isuzu Ascender 128000 miles
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2014 Dodge Grand Caravan 77000 miles
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Old 08-09-2018, 02:00 PM
Envoy04H Envoy04H is offline
Junior Member
2008 GMC Envoy SLE
Silver Mist Metallic 4.2L I6 2WD
Join Date: Aug 2010
Location: Southeast,GA
Posts: 21
Low Beams won't work

My headlights are not possessed. Low beams will not work. I have looked in the fuse box under the hood. I find that there is one relay where all of the documentation for troubleshooting says there should be TWO. One for headlights and one for a fan. They should be interchangeable. I checked the legend for the fuses and indeed there is only ONE. Swapping the relays when there are two is supposed to help to identify the problem. What shall I do when there is only one?

BTW my beloved 04 Envoy SLT was in an accident and they totaled it.

This problem is with the 2008 Envoy SLE with 107K miles that I got to replace it.

It seems to have electrical problems too but no codes being thrown.

Anyone else having this problem?
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