General Description

INPUTS
The Transfer Case Control Module (TCCM) receives input signals from the following sources:

- Transfer case selector switch on the instrument panel.
- Park/neutral position switch on vehicles with automatic transmissions.
- Clutch safety switch on vehicles with manual transmissions.
- Vehicle speed sensor buffer which supplies vehicle speed signals.
- Encoder switch within the electric-shift motor which provides actual mode and range information signals.
- Data link connector (DLC) pin J which provides diagnostic enable.

OUTPUTS
After processing the input information, the Transfer Case Control Module (TCCM) outputs signals to the following:

- Electric shift motor to effect mode and range shifts.
- Selector switch status lamps to provide transfer case status information.
- Diagnostic trouble codes (DTC) which are output via the selector switch status lamps.