Encoder Switch Inputs

The four-channel encoder switch indicates current transfer case mode and range to TCCM. The encoder switch is located inside the encoder itself and is not serviceable. The TCCM reads status of four channels to determine range and mode in which transfer case is operating or whether transfer case is shifting between modes and/or ranges. See Figure and Figure .

The encoder assembly is composed of an inner ground ring in contact with a 3-leg wiper arm. The 3-legs of the wiper, spaced 120° apart, make contact with the conductive areas of the four channels. When any leg of the wiper arm is in contact with the conductive area of any channel, a path to ground is provided to the inner ground ring. See Figure and Figure . To see a schematic of encoder switch See Figure.

The channel signals in various transfer case operating modes and ranges are shown in ENCODER SWITCH CHANNEL SIGNALS & POSITIONS  table below. Any combination of signals not listed in ENCODER SWITCH CHANNEL SIGNALS & POSITIONS  table are considered invalid by TCCM.

Fig 1: Enabling Status Lamps Schematic