The only thing that comes to mind after review, is the rear cargo door jamb switch. Theory would support this, as inertial force in drive would act against it, and not any other time. ALLDATA shows me a pretty poor illustration of a pin switch in the RH 'd' pillar, in the cargo door opening. It is shown in the schematic, as a two wire switch, colors purple and black. It looks like you can confirm this as the culprit, by first locating the switch, and then just disconnect it. If it doesn't exhibit the same symptom, you are on the right track. How is the adjustment on the rear door, and can you duplicate it by push/pull or rattling the door?
Friday, October 16th, 2020 AT 1:22 PM