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.
Heated Seats (Service Information): Operation
The heated seat system operates on battery current received through fused ignition switch output (RUN) circuits, so that the heated seat system will only operate when the engine is running. The heated seat system will turn OFF automatically whenever the engine is turned OFF.
The Comfort Seat Wheel Module (CSWM) is used to control the heated seat system. The CSWM responds to heated seat switch and ignition switch status inputs and controls the 12 volt output to the seat heating elements through integral solid-state relays.
The heating elements for the selected seat are energized when any of the heated seat switches are pressed. Light Emitting Diodes (LEDS) on each switch indicate the level of heat in use: Pressing the switch once will select high-level heating. Pressing the same switch a second time will select low-level heating. Pressing the switch a third time will turn the heating elements OFF.
When high-level heating is initially selected, the heated seat control logic provides a boosted high heat level during the first four minutes of operation, and then lowers the heat level to the normal high temperature level. After 30 minutes of continuous operation on high heat, the heated seat control logic lowers the seat temperature to the low level. At that time, the number of illuminated LEDs change from two to one, indicating the temperature setting change. Operation on the low-level heat setting also turns OFF after 30 minutes. The heated seat system will automatically turn OFF if an open or short in the heating element circuit is detected.
Auto ON Feature - The Auto ON feature is a customer configurable feature that when enabled will activate the driver heated seat and heated steering wheel on engine start based on ambient temperature. If Auto ON feature is enabled in the radio, and the ambient temperature is at or below 4°C (40°F) the CSWM will activate the driver heated seat and heated steering wheel feature at the high level during engine start. This feature also works with Remote Start.
The actual ambient temperature of where the vehicle is stored is what is read. If the vehicle is in a garage that is warmer than the actual outside temperature, the Auto ON feature will behave based on the actual temperature where the vehicle is stored.
The heated seat system is diagnosed using a scan tool.
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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.