If you run into a suspected HWH valve not working (raise, lower, travel) you can unplug the electrical connection. Check the ohms it should be close to 16. If not you can try to clean the contacts or else replace the valve.
HWH has a bunch of publicly available tech manuals too.
Jeff
2001 Dynasty Regent tag axle
Cummins 350 8.3 ISC
2012 Jeep Grand Cherokee Overland
FMCA U60 Task Force Chairman
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Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
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