Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Engine ON.
Verify that no heated seat DTCs are set.
- If any heated seat DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no heated seat DTCs are set
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.
- Go to next step: 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.
- Go to next step: If the parameter changes
Replace the K29F Seat Heating Control Module - Front.