Dashlogic and ride height sensor voltage

[CorvetteFan1953]

I found 4 PIDs in the Dashlogic configuration that correspond to each corner of the car, labeled as position sensor voltage. Problem is they all show 0.000V with key on engine off. I thought this would be an easy way to see if my ride height sensors were near 2.9V, guess not. Or do these only work with the engine running? Is there anyway to see these voltages without a Tech2?

I also see two separate spark retard PIDs, knock retard, and torque management spark retard. I have put these on my HUD to see whats what.

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