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.
HVAC Control Module
The heated cooled seat system operation is controlled through the switch inputs of the HVAC control module. The heated cooled seat switches provide 3 inputs that are relayed to the Memory Seat Module (MSM) through GMLAN messages. Whenever one of the switches is pressed a message is sent to the MSM indicating switch is active. During heated cooled seat operation the HVAC control module displays the switch symbol of the active operating mode and the temperature level bars on the climate control display. The mode symbol and temperature bars that are displayed is determined by a GMLAN message from the MSM.
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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.