Cruise Control, all 3 brake lights out - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 07-13-2010, 10:39 AM
jaywdetroit jaywdetroit is offline
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Cruise Control, all 3 brake lights out

I am trying to search the forums for answers to this. I apologize if it's been answered.

Can someone get me started troubleshooting this? I realize these can be separate issues, but I noticed someone else on the board had the same situation. (Both Cruise Control, and ALL 3 brake lights out.)

I have a 2002 Trailblazer. I called autozone and they tried to tell me that there are no fuses for the brake lights on a 2002 Trailblazer, and wanted to sell me the pedal switch.
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  #2  
Old 07-13-2010, 04:07 PM
WOOLUF1952 WOOLUF1952 is offline
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IIRC, if the brake lights don't work the cruise control won't work.

Did you test all the fuses in the rear fuse box?
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  #3  
Old 07-13-2010, 04:14 PM
jaywdetroit jaywdetroit is offline
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Originally Posted by WOOLUF1952 View Post
IIRC, if the brake lights don't work the cruise control won't work.

Did you test all the fuses in the rear fuse box?
No, because 1. I don't know how to test a fuse. 2. I don't know which one's to test. 3. I was told by Autozone, that the fuses are irrelevant.

I am hoping someone who knows what they are doing can steer me straight and say something like - Replace fuse X and Y and it should work.
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  #4  
Old 07-13-2010, 08:47 PM
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RayVoy RayVoy is offline
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Without checking, the only mechanical component that is common is the brake light switch.
I think it's mounted near the pedal arm.

There may also be a fuse that is common, hang on and I'll look it up

Yep, fuse #12 in the underhood fuse panel
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  #5  
Old 07-13-2010, 11:48 PM
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the roadie the roadie is offline
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Some Autozone staff seem to be in a competition to see who can be the dumbest neanderthal in the world so they can get picked for next season's Big Brother. I swear.

The cruise control switch is also fed power from the HVAC1 fuse #39 in the rear fuse block, but a failure of that wouldn't take out the brake lights. I bet Ray has it nailed. Some things he nails first, and I just stand by and cheer him on.
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Old 07-14-2010, 06:40 AM
jaywdetroit jaywdetroit is offline
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Some Autozone staff seem to be in a competition to see who can be the dumbest neanderthal in the world so they can get picked for next season's Big Brother. I swear.

The cruise control switch is also fed power from the HVAC1 fuse #39 in the rear fuse block, but a failure of that wouldn't take out the brake lights. I bet Ray has it nailed. Some things he nails first, and I just stand by and cheer him on.
Thanks to both of you, I will try that fuse later today...
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Old 07-14-2010, 06:49 AM
jaywdetroit jaywdetroit is offline
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Okay- I actually went and tried this right away.

I have my truck parked in the garage so it is easy to see the reflection of the brake lights off the door.

I checked fuse #12. Yep you were right. It's fried. (I'm no tech, so forgive the simplicity of my language here.) The 'silver' band inside the fuse was broken.

I replaced the fuse with the extra '25' on the side. I pressed the brake pedal...

The brake lights lit up for about 1 second, then went out. Checked the 'new' fuse. It was blown. (Silver band melted away)

So something is blowing the fuse out when I press the brake pedal.

Now What????
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Old 07-14-2010, 07:03 AM
ghoster ghoster is offline
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Sounds like a nice little short somewhere in the brake light circuit. My first guess, knowing that they had some issues, would be the circuit board attached to the tail light assembly. You will need to get a couple of fuses to test it. I think you can unplug one of the tail lights completely and press the brake pedal. If it blows the fuse, plug that one back in and unplug the other side and try it again. If it still blows, at least you will know its not either of the brake light assemblies...... but I would bet a dollar that it is one of them.
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Old 07-14-2010, 07:07 AM
jaywdetroit jaywdetroit is offline
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Quote:
Originally Posted by ghoster View Post
Sounds like a nice little short somewhere in the brake light circuit. My first guess, knowing that they had some issues, would be the circuit board attached to the tail light assembly. You will need to get a couple of fuses to test it. I think you can unplug one of the tail lights completely and press the brake pedal. If it blows the fuse, plug that one back in and unplug the other side and try it again. If it still blows, at least you will know its not either of the brake light assemblies...... but I would bet a dollar that it is one of them.
Thanks, I'll give that a try. Assuming it is one of the circuit boards, are the difficult/expensive to replace?
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Old 07-14-2010, 07:13 AM
jaywdetroit jaywdetroit is offline
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Originally Posted by jaywdetroit View Post
Thanks, I'll give that a try. Assuming it is one of the circuit boards, are the difficult/expensive to replace?
Again assuming that it's the circuit board, would it be worth the extra money to save time and hassle to just buy a whole tail light assembly?
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