Question about 2002 Chevrolet TrailBlazer

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Both brake lights went out on my 02 trailblazer

I checked the fuses and replaced the brake switch and bulbs, I don't know what else to check.

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  • t_elmore20 May 08, 2009

    kind of a car mechanic virgin and I am not sure if I should take the plastic off of the wheel well to find the module for the brake light or not

  • Darren Redmond May 09, 2009

    both rear tail/stop lights went out. i've replaced the bulbs (3157). my next thought was the actual brake switch, can you tell me where to find this. thanks

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There was a significan issue with brake lights on the early s-trucks from GM. I do not know if there was a recall on this issue, I do think so as it is safety related. If you have not taked your vehicle in for replacement lamp sockets to your dealer, I would suggest that you do. It should be free of charge. If you do not know if the vehicle has been repaired, the dealer can look it up in the GM service system under the vin code. I am not sure if they will do this over the phone for you, but it is worth the call.

Posted on May 26, 2009

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Most brake lights end in parrallel grounds check them ... bad sockets and some cars have a module for the brake lights in the rear fender area looks like a pager or garage door opener if you find it unplug it and smell it if its burnt..

Posted on May 08, 2009

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1 Answer

No brake lights


This may sound confusing, so here goes.
Normally I would say check the turn signal switch because for decades the brake light switch power went thru the turn signal switch.
But in your case, its more complicated.
The wiring diagram looks like you have a wire from the brake switch and another from the turn signal that joins inside the right and left rear tail lamp assembly. There are also fuses in the rear fuse box including one for just the brake lights. So its possible that fuse is dead and yet the turn signals would work.
You may have to get a book with the wiring diagrams to trace the circuits.

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Does your car have the `lamp out'indicator system? It's more complicated.
My manual shows fuse #28 , a 15 amp fuse powers the brake bulbs.Is this the one you changed?
A bulb can be out for a long time and you don't notice it,then the other burns out and you think they both went out at the same time,but they might not have,see?
So check the bulbs and make sure you got that brake switch installed correctly. don-ohio (:^)

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When you say you checked the fuse, are you getting power in and out of it and the brake light switch ?

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For the low beam problem, Swap relays 45 & 46 in the underhood fuse panel. Relay 46 is for the Low Beams. If that fixes the light, replace the relay that cam out of position 46.
Since the high mounted brake light is working, that indicates that the brake switch is good. You need to check the bulbs in the rear tail light assembly, if they are good, check fuse #34.

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This is going to be a problem with your light switch or dimmer switch. Replace the light switch and see if that resolves the issue.

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1 Answer

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Apr 16, 2011 | 2002 Chevrolet TrailBlazer

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