B2725

DTC B2725

Circuit Description
The range/mode switch circuit consists of 5 modes, The transfer case shift control module supplies a regulated 5 volts, DC to the switch through the 5-volt regulator circuit. The current travel through the resistor of the currently active mode. The current is then returned 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 of the modes are selected they will complete a circuit through their own specific resistor. The transfer case shift control module continuously monitors the switch input to determine whether the 4HI, AUTO 4WD, 2HI, or 4LO mode was selected by the driver.

Conditions for Setting the DTC
^ The system constantly monitors the voltage on switch signal circuit.
^ If the system detects a voltage level under 0.1 volt or greater than 4.9 volts, the DTC is logged.

Action Taken When the DTC Sets
^ All shifting will be disabled.
^ The SERVICE 4WD indicator will be latched on for the remainder of the current ignition cycle.

Conditions for Clearing the DTC
^ The transfer case shift control module will clear the current DTC if the condition for setting the DTC is not currently present.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests for proper operation of the transfer case mode select switch.
3. Tests the mode switch for proper resistance values in all mode switch states.
4. Tests the switch signal wire for a short to ground, short to voltage, or high resistance.