Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON.
Verify the scan tool Body Control Module Driver Seat Heating/Venting/Cooling Mode parameter changes between Off and Seat Back and Cushion Heating when pressing the heated seat switch.
- If the parameter does not change
  Replace the A20 Radio/HVAC Controls.
- If the parameter changes
Verify the scan tool Body Control Module Passenger Seat Heating/Venting/Cooling Mode parameter changes between Off and Seat Back and Cushion Heating when pressing the heated seat switch.
- If the parameter does not change
  Replace the A20 Radio/HVAC Controls.
- If the parameter changes
Verify that both the driver and front passenger heated seats operate.
- If both the driver and front passenger heated seats are inoperative
  Refer to Circuit/System Testing - Both Heated Seats are Inoperative
- If just one of the heated seats is inoperative
  Refer to Circuit/System Testing - One Heated Seat Inoperative
- If both heated seats operate
All OK.