Transfer Case Range Select Switch Input (2WD, 4WD Auto, 4WD Lock, And 4WD Low Select Switch)

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

The Transfer Case Switch Module (TCSM) is responsible for notifying the BCM of switched operation over the LIN bus. The BCM communicates the switched position to the DTCM via the CAN-B bus.

The NEUTRAL Select Switch Input will provide the operator with the ability to place the Transfer Case in Neutral. The Transfer Case Range Switch input will provide the operator with the ability to place the transfer case in 2WD, 4WD AUTO, 4WD LOCK, and 4WD LOW. The NEUTRAL Select Switch is a momentary pushpin switch; the Transfer Case Range Select Switch is a 4-position rotary contact switch; both of these switches are provided through a resistor network for diagnostic purposes. The input will have an internal 1.0K +/- 1% pull-up resistor to 5V.

As the selected position in the switch varies and/or the NEUTRAL Switch is depressed or not, the resistance within the and TCSM will vary. Hardware, software, and calibrations within the TCSM will be provided that interpret the external resistance between the module's Transfer Case Range Select Switches voltage supply and Transfer Case Range Select Switches inputs as given in the table below:

NOTE:

There is no requirement for the DTCM to distinguish between a neutral request from the 4WD AUTO or the 4WD LOW position. Resistances in these ranges will be represented as a Neutral Switch Activation.