As far as I know the signal is shared by the body module and engine ecu, (dependant on specific model) and being hall effect you should have a supply voltage on the signal line when disconnected. You will probably need to confirm wiring integrity to both units, I suspect the engine ecu will supply the reference voltage but either module could be pulling it down, or shorted wiring.
Test the wiring and disconnect each module and see what you get.
Chris
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