Thanks. It has been a while since I looked at a TIPM based vehicle but I think the compressor on this is a high side driver. Meaning the switch is on the batter side of the load which would be the TIPM as there is no relay for this circuit. You are referring to a low side driver which would be the switch is on the ground wire and when it is closed, it completes the circuit.
On this vehicle the compressor should only have power at the compressor when the PCM grounds the control circuit and then sends power through the TIPM to the compressor. So you are correct that it is ground controlled but the control wire from the PCM to the TIPM is what is ground controlled.
Take a look at the wiring diagram and you will see the ground wire goes straight to ground. So the compressor itself is a high side driver. The low side driver would be considered the control side.
Let us know if you need more info. Thanks
Tuesday, July 28th, 2020 AT 4:54 PM