BW 4482-NR4 Transfer Case

Transfer Case Shift Control Switch Inoperative
Circuit Description
The mode switch circuit consists of the following four switches:
^ 4LO
^ All Wheel Drive (AWD)
^ Neutral
^ Traction Control System (TCS)

The transfer case shift control module supplies a regulated 5 volts DC to the switch through the 5 volt reference circuit. The current travels through the resistor of the currently active switch. The switch then returns the current to the transfer case shift control module through the switch signal circuit.

The transfer case shift control module constantly monitors this signal voltage to determine the condition of the mode switch circuit.

When each switch is depressed, the switch completes a circuit through the respective resistor. The transfer case shift control module continuously monitors the switch input to determine which of the following buttons is selected by the driver:
^ 4LO
^ AWD
^ Neutral
^ TCS

Test Description





The numbers below refer to the step numbers on the diagnostic table.
2. This step tests the functionality of the mode switch.
3. This step tests the modules ability to operate the transfer case modes.