Diagnostic Enable Input

Wiring Schematic For Enabling The Status Lamps:

OPERATION
When pin J of the Data Link Connector (DLC) is connected either to pin A of the DLC or to a good ground while the ignition is on, the diagnostics routine of the Transfer Case Control Module (TCCM) is activated. When the diagnostics routine is activated, the transfer case selector switch 4HI and 4LO status lamps flash the diagnostic codes.