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 MANUALSJEEP2009COMMANDER 4WD V8-5.7LREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - BODY AND FRAMESEAT TEMPERATURE CONTROL MODULEDESCRIPTION AND OPERATIONHEATED SEAT MODULE - OPERATION
2009 Jeep Commander 4WD V8-5.7L
Heated Seat Module - Operation
2009 Jeep Commander 4WD V8-5.7LSECTION Heated Seat Module - Operation
OPERATION
The heated seat module (HSM) is fed by a B+ circuit and continues to receive power regardless of ignition key position. The module is grounded to the body at all times through the electrical connector. The HSM monitors the ignition status message on the Controller Area Network (CAN) data bus. If the ignition state is ON/RUN then the HSM will power the heating elements. The heated seat system will turn Off automatically whenever the ignition switch is turned to any position except ON/RUN. In response to the CAN inputs the heated seat module will control the battery current to the appropriate heated seat elements.
When a heated seat switch CAN data bus signal is received by the heated seat module, the module energizes the selected heated seat element. If the heated seat module detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate diagnostic trouble code (DTC).
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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.