2002 Suburban HVAC wiring diagram?

Tiny
GRANTJURG
  • MEMBER
  • 2002 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 167,000 MILES
I am unable to control the front mode or the rear blend. B0124, B0268, B0408, B0434, and B3531 codes. All are short/Open circuit or circuit malfunction codes. I have a mess to figure out. Does anyone have wiring diagrams for the auto with aux?
Monday, March 2nd, 2026 AT 12:29 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,112 POSTS
So with all of these codes it means you have a shared issue, a ground is off which I have seen before, here is the location of the ground I would check first with is at the right side of the dash pillar A. Check out the images (below). Please let us know what happens.
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Tuesday, March 3rd, 2026 AT 10:02 AM
Tiny
GRANTJURG
  • MEMBER
  • 3 POSTS
Thank you for your time and your reply! That diagram shows that same ground for the blower motor too. However, that seems to works fine. Could the ground be compromised for some but not the blower motor?
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Tuesday, March 3rd, 2026 AT 1:30 PM
Tiny
GRANTJURG
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  • 3 POSTS
Would you happen to have the rest if the wiring diagram? One that shows the top part too. And how about the rear hvac stuff? Since I can't control the rear blend actuator, I have some kind of issue back there too.
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Tuesday, March 3rd, 2026 AT 4:38 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,112 POSTS
Sure, here you go. Let me know what you find so it will help others. Check out the images (below). Ken
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Wednesday, March 4th, 2026 AT 7:32 AM

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