Looking for circuit board schematics for car HVAC controls

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I’m trying to replace my 2005 GMC Yukon knob and button heater control to a touch screen operation. I’m trying to figure out the circuitry using a multi meter but I’m having some difficulties because I dont know what the values relate to. I am trying to find the circuitry schematics for the controls but cant seem to find anything. Looking for any input or guidance.

Thanks for any advice.

~Freeman

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Hi Freeman.

You might try getting a hold of a service manual for your vehicle. That might have the schematics in it. If it doesn’t, you would need to contact GM to see if they can supply schematics.

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Thanks for the reply, unfortunately there are no schematics that show the inner circuit boards available.

I’ve looked in the service manuals and Googled the heck out of every possible nomenclature I can think of for this.

Got nothing else to lose so I might as well try your idea of emailing GM.

Thanks again :wink: