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This is what David C Klasse worked out for his 95 C280, and it seems to be the same for my 98 C230, so maybe it works for you:
With ignition in on position, turn climate controls on, then press and hold REST for 5 or so seconds, or until you see an 01 flash then another number will flash (inside temp), then back to one, use the arrow up (defrost) and arrow down (feet) to scroll up and down through the codes. 1. In-car termperature sensor (with aspirator blower) 2. Outside temperature sensor 3. Heater core temperature sensor 5. Evaporator temperature sensor 6. ECT sensor (Coolant temp.), e.g. 12*5 = 125C 7. Refrigerant pressure in bar, e.g. 12*8 = 12.8 bar 8. Blower control voltage, e.g. 16*5 = 1.65 volts 9. Software status of A/C pushbutton control module 15. Selected in-car temperature 20. Version code 21. Engine Speed (RPM), e.g. 6*0 = 600 rpm 22. Terminal 58d (Bat. Volt.), e.g. 99.0 = 99% of voltage 23. Vehicle speed (Kilometers Per Hour) 50. Not used – 00 51. Number of current slip recognition (poly-V-belt) 52. Number of stored slip recognitions (poly-V-belt)
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