Here is the circuit as shown in the ECM manual. A "good" switch reads '0' ohms from center to each leg. My bad one reads about 400 ohms. Which causes havack with other
push button switches on the same circuit. It thinks it is getting the signal to operate a blower vent. This switch would be very difficult to open up. But I now have 2 bad ones so
maybe I will try. I found on the ALPs website a switch called a "self return" switch. The center leg of this switch is ground. So when you click "up" the resistance (or capacitance)
goes up incrementally. Click "down" it is reversed or high to low readings. Each click the fan speeds go up or down. Not in the circuit attached is the brains, or AC Condenser module.
That is what takes the command and sends it back to the motors, etc.
By installing a new 20 pulse encoder, it fixed all the issues with the other vent motors going crazy, and the fan speeds move but very intermittently. To many pulses maybe, and not enough delay time. Hence why I think this is in reality a "self return" style??