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.
Front Heated Seat System Operation
Depressing either of the two front door trim panel mounted, heated seat switches sends a hardwired, resistor multiplexed signal to the corresponding door module. The door module then sends a PCI data bus message to the Memory Heated Seat/Adjustable Pedal Module (MHSAPM). The module detects the heated seat switch status via the PCI data bus circuit and energizes the appropriate heated seat element. The programmed software in the MHSAPM allows it to know the temperature of the seat cushion by a resistance value generated from the heated seat temperature sensor. When the correct preset temperature set point is achieved the module will de-energize the heated seat element. The module will continue to toggle the heated seat element 12v supply ON and OFF to maintain the selected temperature of the seat.
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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.