2004 Tahoe Z71 brake lights not working. I replaced the bulbs, fuses, and brake light switch and they still are not working. Any ideas??

brivas
100

Asked by Sep 12, 2012 at 10:10 PM about the 2004 Chevrolet Tahoe Z71 4WD

Question type: Maintenance & Repair

I replaced the bulbs, fuses, and brake light switch and they still are not working.  Any ideas??

12 Answers

Michael McGrail
8,265

Does your Tahoe have the tow package?

3 out of 3 people think this is helpful.
brivas
100

Yes, though we've never used it

3 out of 3 people think this is helpful.
Michael McGrail
8,265

Inspect the trailer hook up wires. Make sure the t-plug has not come unhooked. Also, you should have two fuses for brakes. make sure to inspect both.

Best Answer
brivas
100

I replaced three fuses, two for the brake lights and one for the third brake light and cruise control. Can you tell me where the t-plug is? I've never used the towing components. Thanks!

3 out of 3 people think this is helpful.
Michael McGrail
8,265

Back track the trailer plug. It will run to a t-plug where it connects to the brake lights and the main harness. Your tail lights run through the t-plug so if it fails.. No brake lights. And it is quite common. The t-plug is usually tucked up behind the bumper (different on every vehicle though). Once you find it, I would just unplug it and connect the tail lights up to the main harness directly. See if that fixes your problem.

Best Answer
Michael McGrail
8,265

Here is a photo to give you an idea what to look for

2 out of 2 people think this is helpful.
Michael McGrail
8,265

Additional question.. Do your turn signals and hazard lights work?

3 out of 3 people think this is helpful.
brivas
100

Thank you! I will give it a try

2 out of 2 people think this is helpful.
brivas
100

Yes, turn signals and hazards work. Cruise control does not. Symptoms seemed to match bad stop light switch, but replscung it didn't help. The retainer clip is in place, as well.

2 out of 2 people think this is helpful.
Michael McGrail
8,265

If there is any fault in the brake light system, the cruise will not work. But the brakes also run through the turn signal switch in your Tahoe from what I see, so since the turn signals are working, then we know it is good.

4 out of 4 people think this is helpful.
Bennie_Combs
0

I'm having the same problem, voltage has been checked and all is good, signal lights, tail lights, hazard lights and all fuses are ok, Replaced the box under the dash, after that the gear shift would not go into gear, Thought it was a bad part so got another one and same thing. Put the old box back on and still no brake lights but it would go into gear then. I do have a tow package. Any ideas on this???

Bennie_Combs
0

The vehicle is a 02 Tahoe. All help is greatly appreciated. Thanks

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