Brake light wiring?

Tiny
CHRISTINE 77
  • MEMBER
  • 1994 BUICK LESABRE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
When my key is off and I press the brake light, or the brake pedal, I mean my stereo comes on. I don't know how to fix it. Any help would be appreciated.
Monday, May 5th, 2025 AT 2:25 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Do you have an aftermarket radio? It sounds like it is wired incorrectly. There is no connection between the radio and brake lights fyi. Here is the brake light wiring diagrams so you can see for yourself. Check out the images (below). Please let us know what happens.
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Tuesday, May 6th, 2025 AT 11:39 AM
Tiny
CHRISTINE 77
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  • 24 POSTS
Thank you and I realize that they're not supposed to connect but I got the car for my son used obviously and it had some major wiring mishaps I guess you could call it. I had never heard of a car radio coming on without the key on by pressing the brake. I just thought it was something that you might be able to help with pointing me in the right direction on which wire to check out yeah.
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Tuesday, May 6th, 2025 AT 7:13 PM
Tiny
CHRISTINE 77
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  • 24 POSTS
Thank you again.
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Tuesday, May 6th, 2025 AT 7:13 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sure, I can help, we will need to remove the radio and disconnect the white wire from the power source of the radio and reconnect it to the power source of the original radio which is an orange wire and a yellow wire. That way the radio will work normally again, if you upload images of the wiring I can help you further. Check out the images (below).
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+1
Thursday, May 8th, 2025 AT 10:17 AM
Tiny
CHRISTINE 77
  • MEMBER
  • 24 POSTS
Not sure how to get this clip open or what that orange wire that's broken goes to.
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Friday, May 9th, 2025 AT 2:34 PM
Tiny
CHRISTINE 77
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  • 24 POSTS
This.
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Friday, May 9th, 2025 AT 2:34 PM
Tiny
CHRISTINE 77
  • MEMBER
  • 24 POSTS
Plus I have questions about a couple other spots with pictures but can only seem to add one at a time. Where does this plug into it's by the driver side door under the dash just hanging out there.
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Friday, May 9th, 2025 AT 2:37 PM
Tiny
CHRISTINE 77
  • MEMBER
  • 24 POSTS
Also could you possibly point me into the direction of where my fan thermostat might be I found the thermostat and changed it, but the fans still don't kick on with temperature change. I also change the temperature sensor already.
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Friday, May 9th, 2025 AT 2:37 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Please start a new question for the thermostat issue, we only handle one problem per thread. The empty connector looks like it if for the dome lights, and I would remove the radio so you can service it, BTW it looks like you found way the radio comes on with the brakes. Please upload more images if you have any questions.
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Saturday, May 10th, 2025 AT 11:40 AM

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