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Brake lights not working

Tiny
SEMAJ BERRYMAN
  • MEMBER
  • 2005 CADILLAC CTS
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 169,000 MILES
My brake lights won't light up on my car, but the tail lights work. Put a new brake light switch in and I changed the BAS fuse under the back seat and still no results.
Monday, March 11th, 2019 AT 3:01 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a diagram for you to view. You need to check the voltage to the stop light switch. It uses a 5 volt reference voltage to send a signal to a module which controls the brake lights.

Roy
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Monday, March 11th, 2019 AT 3:39 AM

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