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 |
|---|---|
| Control - Terminal 6@S126 Drive Mode Select Switch | Ignition Voltage - Supplied by a control module. |
| Control - Terminal 7@S126 Drive Mode Select Switch | The output circuit is switched to ground to activate the component. |
| Component | Description |
|---|---|
| K9 Body Control Module | The module controls various vehicle functions like lighting, central door locking, power windows, etc.The control module also reads various switches and sensors and makes their values available via serial data. |
| K69 Transfer Case Control Module | The control module contains a microprocessor used to process input data to control outputs. |
| S126 Drive Mode Select Switch | The switch S126 has an internal resistor ladder network. A specific resistance is generated dependent on the position of the switch. |