Reading Sensor Values
WARNING: This page is about a different car, the 1996 Mercedes-Benz C280 and 1996 Mercedes-Benz C220. However, it is still accessible from the selected car via links, so may be relevant.
The ACC 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.