Sunroof and power windows not working

Tiny
JIMMYPRINCE
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • 3.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 123,000 MILES
My power windows and my sunroof nor is my cruise control working. What is the problem? I checked the fuses in the relays under the hood and they were good.
Saturday, December 26th, 2020 AT 3:58 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

The windows and the sun roof are both powered by a 30 amp circuit breaker. You need to check it to see if it is bad. If you look at the two pics below, the first is from the sun roof motor wiring schematic and the second is from the power window schematic. Note they both have the same power supply. If you look at picture 3, I highlighted the circuit breaker responsible for powering them. You need to check if there is power in and out from that circuit breaker.

Here is a link that you may find helpful:.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find or if you have other questions.

Take care,
Joe
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Sunday, December 27th, 2020 AT 9:44 PM

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