Circuit/System Description
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
For an overview of the component/system, refer to: Transfer Case Description and Operation
| Circuit | Description |
|---|---|
| 5 V Reference - Terminal 1@B139 Transfer Case 2WD/4WD Actuator Position Sensor | Regulated voltage supplied by the control module. |
| Signal - Terminal 2@B139 Transfer Case 2WD/4WD Actuator Position Sensor | The control module input circuit has an internal resistance connected to ground. |
| Low Reference - Terminal 3@B139 Transfer Case 2WD/4WD Actuator Position Sensor | Grounded through the control module. |
| Component | Description |
|---|---|
| B139 Transfer Case 2WD/4WD Actuator Position Sensor | The sensor contains a hall effect sensor that varies its output voltage in response to a magnetic field. The hall effect sensor is used for the following sensing application: Transfer Case Range |
| K69 Transfer Case Control Module | The control module contains a microprocessor used to process input data to control outputs. |