Circuit/System Verification

Ignition ON.
Verify that no heated seat DTCs are set.
- If any heated seat DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- If no heated seat DTCs are set
Engine ON.
Verify the scan tool Front Seat Heating Control Module Driver Seat Heating/Venting/Cooling Mode parameter changes between Off and Back & Cushion Heat after pressing the driver heated seat switch.
- If the parameter does not change
  Replace the A26 HVAC controls.
- If the parameter changes
Verify the scan tool Passenger Front Seat Heating/Venting/Cooling Mode Switch parameter changes between Off and Back & Cushion Heat after pressing the passenger heated seat switch.
- If the parameter does not change
  Replace the A26 HVAC controls.
- If the parameter changes
Replace the K29 Seat heating control module.