2HI to 4HI to 4LO Selector Switch Input

4WD Selector Switch Wiring Schematic:

OPERATION
When the operator presses the 4LO area of the rocker switch while the transfer case is in either 2HI or 4HI, the 4LO contacts of the selector switch close, connecting circuits 141 and 1559, and furnishing 12-volts to pin C3 of the Transfer Case Control Module (TCCM) connector. The 12-volt signal at pin C3 commands the TCCM to signal the electric-shift motor to shift the transfer case into 4LO. Once more, the contacts return to the open position as soon as the switch is released.