Thanks for your reply. No, the one you referred is for damper motor. As you can see, there are 4 connectors on the wiring picture (not including plugs for ground and front thermostats): two at left-lower corner are the damper position switch and 9-pin connector. The center one (black) is for damper motor. The upper left connector is for ADC IV.
I never used "rapid ice" feature on my refrigerator. Is it ok to leave connector for fast ice/fast freeze heater unconnected?