Reading Sensor Values
WARNING: This page is about a different car, the 2000 Mercedes-Benz C43, 2000 Mercedes-Benz C280, 1999 Mercedes-Benz C43, and 1999 Mercedes-Benz C280. However, it is still accessible from the selected car via links, so may be relevant.
The A/C push button control module (A/C-heater control panel) may also be used to display A/C-heater system sensor values. The display window will show actual temperature readings, refrigerant pressure, blower motor control voltage, and software version of the A/C-heater control panel. Temperature control is maintained during this self-diagnostic mode.