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Module-Transfer Case Control: Description

WARNING: This page is about a different car, the 2005 Dodge Pickup and 2005 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Transfer Case Control Module (TCCM)
GC0006128Courtesy of DAIMLERCHRYSLER CORP.
1 - INSTRUMENT PANEL
2 - TRANSFER CASE CONTROL MODULE (TCCM)
3 - TRANSFER CASE SELECTOR SWITCH

The Transfer Case Control Module (TCCM) (2) is a microprocessor-based assembly, controlling the 4X4 transfer case shift functions via the actuation of a shift motor and utilizing the feedback of a mode sensor assembly. See Fig 1. Communication is via the PCI serial bus. Inputs include user selectable 4X4 modes that include 2WD, AWD, 4HI, 4LO, and Neutral. The logic and driver circuitry is contained in a molded plastic housing with an embedded heat-sink and is located behind the left side of the lower instrument panel (1).