No power to low pressure switch?

2017 GMC SIERRA
100,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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ROY JR MARTINEZ
  • MEMBER
  • 3 POSTS
All fuses and relays good. Controls all light up, three wires at pressure switch. Checked each with a test light none lit it up.
Apr 29, 2023 at 11:14 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,688 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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Apr 30, 2023 at 4:01 AM
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