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Amedee
Amedee, GMC Technician
Category: GMC
Satisfied Customers: 25846
Experience:  ASE Technician advanced level specialist
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I have a 2003 Yukon (non adjustable pedals) and the brakes

Customer Question

I have a 2003 Yukon (non adjustable pedals) and the brakes do not work. I have checked all fuses, replaced the stop light switch. I checked the brake light bulbs. I disconnected and reconnected the connectors at the right fender module.
What areas should I check next?
Submitted: 1 year ago.
Category: GMC
Expert:  Amedee replied 1 year ago.

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?

Customer: replied 1 year ago.
The brake lights do not work. All other lights do work.
1GKEC13Z03R146593
Expert:  Amedee replied 1 year ago.

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.

Expert:  Amedee replied 1 year ago.

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.

Expert:  Amedee replied 1 year ago.

I hope this helps! Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today. It has been a pleasure working with you. Of course please let me know if you have any further questions as I will be happy to help!

Customer: replied 1 year ago.
As stated in the original message, fuses are good. What's next?
Customer: replied 1 year ago.
By the way, forgot to mention, cruise control will not engage.
Expert:  Amedee replied 1 year ago.

Did you try to jump or brake switch?

Customer: replied 1 year ago.
I jumpered white and orange. I also put in a replacement switch.
Expert:  Amedee replied 1 year ago.

So do the brake lights light up when you jumper the switch?

Customer: replied 1 year ago.
No
Customer: replied 1 year ago.
If they would have, it would be a bad switch
Expert:  Amedee replied 1 year ago.

So is there power at the brake light switch?

Customer: replied 1 year ago.
power to orange.
Expert:  Amedee replied 1 year ago.

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?

Customer: replied 1 year ago.
That's correct
Expert:  Amedee replied 1 year ago.

Ok, so there is an open or a break in the wiring after the brake light switch.. like I mentioned earlier

Customer: replied 1 year ago.
Why would there be an open wire? There has been nothing introduced which would cause that.
Expert:  Amedee replied 1 year ago.

Here is a wiring diagram of the stop lamps.

Expert:  Amedee replied 1 year ago.

Maybe you have a bad ground.. did you check the ground?

Customer: replied 1 year ago.
I'm not sure where it's located. I disconnected and checked the two grounds on the frame rail below the driver's seat.
Expert:  Amedee replied 1 year ago.

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..

Customer: replied 1 year ago.
Is there one common ground for all brake lights?
Expert:  Amedee replied 1 year ago.

Only for the outside two..

Customer: replied 1 year ago.
All three are not working.
Expert:  Amedee replied 1 year ago.

Right

Customer: replied 1 year ago.
what would cause all three to not work?
Expert:  Amedee replied 1 year ago.

As long as the bulbs are good, the problem is because they do not have power.

Customer: replied 1 year ago.
I understand that. So if the upper and two lower brake lights do not share a common ground, it's obviously not a ground issue. So where would the fault be?
Expert:  Amedee replied 1 year ago.

Between the brake light switch and the brake lights.. like I mentioned earlier.

Expert:  Amedee replied 1 year ago.

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!