Feature Inputs:

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Mode select switch (MSS)
Wheel speeds (via CAN communication)
Contact plate position inputs A, B, C, D (grounded when closed, open circuit when open)
Transmission neutral
Brake ON/OFF (BOO)

Feature Outputs:

Transfer case synchronization clutch
Transfer case shift motor relays
Integrated wheel-end (IWE) vacuum solenoid
Cluster indicators (via CAN communication)
4WD mode (via CAN communication to PCM)