Sensor Value Check
WARNING: This page is about a different car, the 1999 Mercedes-Benz SL500 and 1998 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
A/C push-button display will show "OP E", if an open circuit exists. Display will show "CL O", if a short circuit exists.
- Temperature display areas in A/C push-button control unit will display (in sequence) temperature sensor readings, refrigerant pressure, fan control voltage, software and control module version. This is useful in checking the tolerance range of temperature sensors and refrigerant pressure. Temperature control is maintained during test.
- Turn ignition on. Set temperature to 72°F. Press REST button for more than 6 seconds. A/C push-button display will show "01" and in-car temperature will alternately appear.
- Press blower motor speed increase button to display next value. See SENSOR VALUES table. Press REST button to end test program.
SENSOR VALUES
| Test Value | System Affected | ||
|---|---|---|---|
| 1 | In-Vehicle Temperature Sensor | ||
| 2 | Outside Temperature Sensor | ||
| 3 | Left Heater Core Temperature Sensor | ||
| 5 | Evaporator Temperature Sensor | ||
| 6 | Engine Coolant Temperature Sensor | ||
| 7 | Refrigerant Pressure (06°4 = 6.4 Bar) | ||
| 8 | Refrigerant Temperature Sensor (73°4 = 73.4°F) | ||
| 10 | Blower Control Voltage | ||
| 20 | Current For Auxiliary Fan in Milliamps | ||
| 21 | Engine Speed In RPM | ||
| 22 | Vehicle Speed In Km/Hr | ||
| 23 | (1) Battery Voltage At Terminal 58D | ||
| 24 | Battery Voltage | ||
| 40 & 41 | Hardware & Software Status | ||
| 42 & 43 | Version Coding | ||
| 52 | Selected Temperature Value | ||
| 54 | A/C Compressor Emergency Shutoff | ||
| 60 | Convertible Top Open (OPE) Or Closed (CLO) | ||
| 61 | Left Outlet Potentiometer Voltage | ||
| 62 | Left Outlet Actuator Voltage | ||
| 63 | Center Outlet Potentiometer Voltage | ||
| 64 | Center Outlet Actuator Voltage | ||
| 65 | Right Outlet Potentiometer Voltage | ||
| 66 | Right Outlet Actuator Voltage | ||
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