on my 2005 trailblazer the headlights will turn themselves on.

Asked by Oct 12, 2014 at 02:41 PM about the 2005 Chevrolet TrailBlazer EXT LT 4WD SUV

Question type: Maintenance & Repair

my 2005 trailblazer's headlights will turn themselves on even after the vehicle has been locked for an hour or more . it has caused the battery to be run down and prevented the vehicle from starting unless it is "jumped". it doesn't do it all the time , any ideas ? it has the 5.3 v8 engine  thank you

4 Answers


Do you have lights that turn on automatically after dark? The switch may be defective. If not you may have a short in the switch. The only way lights will turn on is if there is power applied to the system. The switch is where the break is in the electrical system. If you can, feel the switch after the lights are on and see if you can feel heat from an electrical short. Find out quickly before the fire department is called to put out the fire.

3 out of 3 people think this is helpful.

solid state relay i do beleive its 46 is failing just had it happen to me the relay is in the fuse box

6 out of 6 people think this is helpful.

Well I just thought of something. Is this part of the GM recall on ignition switches? Check it out as to what the issues were on the recall. If the symptoms are the same, talk to GM, not a dealer, but to GM about the possible switch being defective.

2 out of 2 people think this is helpful.

The same problem happened exactly to my car Trailblazers 2005! When I went to garage the Mechanical said to me bullshit things such as he has to chick all car Electrical system to find what kills the battery and it's gonna cost me $1250! Then I asked a friend he has a garage too, he asked me to chick the box fuse and replace the relay that feeds the headlamps which was number 45. So I changed the relay number 45 with new one costs me $31 and it worked with me. Be careful, You don't need to change the battery, it's just the relay that feeds the headlamps which kills the bettrery while the vehicle has been locked!

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

TrailBlazer EXT

Looking for a Used TrailBlazer EXT in your area?

CarGurus has 1,334 nationwide TrailBlazer EXT listings starting at $2,900.


Search Chevrolet TrailBlazer EXT Questions

Chevrolet TrailBlazer EXT Experts

#1 jimjimjim
Reputation 400
#2 chevyp2p
Reputation 90
#3 Jack Adams
Jack Adams
Reputation 80
View All

Related Models For Sale

Used Chevrolet TrailBlazer
94 Great Deals out of 5,326 listings starting at $1,700
Used Chevrolet Tahoe
776 Great Deals out of 28,447 listings starting at $1,500
Used Ford Explorer
937 Great Deals out of 74,004 listings starting at $750
Used GMC Envoy XL
29 Great Deals out of 840 listings starting at $1,200
Used Dodge Durango
298 Great Deals out of 24,124 listings starting at $1,500
Used GMC Envoy
50 Great Deals out of 2,395 listings starting at $1,800
Used Chevrolet Suburban
461 Great Deals out of 18,781 listings starting at $1,399
Used GMC Yukon
520 Great Deals out of 17,128 listings starting at $1,799
Used Ford Expedition
419 Great Deals out of 24,749 listings starting at $1,999
Used Jeep Grand Cherokee
843 Great Deals out of 68,691 listings starting at $864
Used Mercury Mountaineer
39 Great Deals out of 1,478 listings starting at $150
Used Chevrolet Silverado 1500
2,286 Great Deals out of 155,167 listings starting at $1,395
Used Honda Pilot
463 Great Deals out of 19,638 listings starting at $599