SENSORS 1. IN-CAR SENSOR Check the sensor resistance. HINT: If there is an open circuit in the sensor, the system will operate at maximum heating. Conversely, if there is a short in the system, it will operate at maximum cooling. If resistance is not as specified, replace the sensor. 2. AMBIENT SENSOR Check the sensor resistance. If resistance is not as specified, replace the sensor. 3. SOLAR SENSOR Using an ohmmeter, check the continuity. HINT: There is the solar sensor on the safety pad of the assistant side. If there is no continuity, replace the sensor.