GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello and welcome! My name is ***** ***** I can assist you with your question. Are you saying that the brake lights are not working? Can I start by getting your VIN?
I would start by checking the stop amp fuse in the under hood fuse block. If that checks out good, then I would jumper the wires at the brake light switch to see if the brake lights illuminate. If not, and the fuse is good, then chances are you have an open or a break in the wiring between the stop lamp switch and the brake lamps.
There are also two fuses in the fuse block inside the vehicle. Vehicle STOP fuse and VEH CHMSL fuse that should be checked as well.
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Did you try to jump or brake switch?
So do the brake lights light up when you jumper the switch?
So is there power at the brake light switch?
So there's power at the brake light switch but the brake lights do not light up when you jumper the switch using a jumper wire?
Ok, so there is an open or a break in the wiring after the brake light switch.. like I mentioned earlier
Here is a wiring diagram of the stop lamps.
Maybe you have a bad ground.. did you check the ground?
Just check for a ground on the black wires to the brake lights. That will tell you if you have a bad ground or not..
Only for the outside two..
As long as the bulbs are good, the problem is because they do not have power.
Between the brake light switch and the brake lights.. like I mentioned earlier.
Hello! It's Amedee from just answer.
I am just checking in to see how things are going and to see if you need any further assistance?
Please let me know and I will be happy to help!