The owner brought his 2012 Mercedes Benz GL450 to my shop along with the original A/C compressor and junkyard replacement HVAC module.

Let's get out the big guns (PicoScope!), and take a DEEP DIVE to see why the HVAC controller is NOT HAPPY with the A/C compressor, throwing a SHORT CIRCUIT code on the control wire.

Can we get this A/C system to function PROPERLY with the parts on hand??

IVAN'S PICO WAVEFORMS:
https://drive.google.com/drive/folder...

THINKTOOL PROS: ***$170 OFF!!***
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TS100 SOLDERING IRON:
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Enjoy!
Ivan