I think if there is question at to weather the sensor is reading correctly that would be the first thing I would want to verify so you're not chasing your tail trying to figure it out.
As for the autostart I think I may have an answer for you. I have remote start on my truck as well and though it is a '96 I do have an AIC on it. When I remote start it the wires are tagged that are needed to start the truck but not all accessory wires have power to them. My AIC is apparently one of the wires that doesn't have power to it as it will not idle up without the key in it. I've been going to find the wires needed to fix this but just haven't gotten around to it yet. So you may want to get a wire schematic and trace the wires for what sensors are needed to activate the high idle (e-brake circuit?)
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