No power to low pressure switch?

Tiny
ROY JR MARTINEZ
  • MEMBER
  • 2017 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
All fuses and relays good. Controls all light up, three wires at pressure switch. Checked each with a test light none lit it up.
Saturday, April 29th, 2023 AT 6:14 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,853 POSTS
There is no 12-volt power that goes to the A/C pressure switch, there is a 5-volt reference, a pressure signal and a low sensor reference. Here are the wiring diagrams for the pressure sensor so you can see for yourself. Check out the images (below). What kind of problem are you having?
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Sunday, April 30th, 2023 AT 11:01 AM

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