Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2021SIERRA 2500 HD AT4, 6.6L ENG VIN 7REPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTSEATSPOWER SEATSDIAGNOSTIC INFORMATION AND PROCEDURESMEMORY SEAT FEATURE MALFUNCTIONCIRCUIT/SYSTEM DESCRIPTION
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7
Circuit/System Description
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7SECTION Circuit/System Description
For an overview of the component/system, refer to:Memory Seats Description and Operation
| Circuit | Description |
|---|---|
| Signal - Terminal 3 @ S47D Seat Memory Switch - Driver | The control module input circuit has an internal resistance connected to 9 V.When the switch is closed it will pull the signal voltage low. |
| Signal - Terminal 4 @ S47D Seat Memory Switch - Driver | The control module input circuit has an internal resistance connected to 9 V.When the switch is closed it will pull the signal voltage low. |
| Low Reference | Grounded through the control module. |
| Component | Description |
|---|---|
| K40D Seat Memory Control Module - Driver | Depending on the version, the control module can support different functions:
The control module also reads various switches and sensors and makes their values available via serial data. |
| S47D Seat Memory Switch - Driver | The assembly contains 4 individual switches.Each function has its own switch. The switches are connected to a resistor ladder so that a specific resistance is generated for each switch.Depending on the version, the component can support different functions:
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.