The sensors are located inside of the rear bumper.
Always keep the rear bumper clean for the system to work properly.
Components and Components Location
Components
ECM
Battery
Alternator
Starter
Instrument Cluster
Ignition switch or start/stop button
Battery sensor
Hood switch ...
Rear
1. Rear temperature control button
2. Rear AUTO button
3. Rear mode selection button
4. Rear air conditioning OFF button
5. Rear fan speed control button ...