Initial Inspection and Diagnostic Overview

Canceling the diagnostics
The diagnostic operation is canceled or cannot be started, respectively, if the following conditions are present:

1. Vehicle speed > 0 km/h
2. Right-hand mixing chamber temperature
>80 °C
3. Left-hand mixing chamber temperature
>80 °C
4. Rear fan temperature > 95 °C
5. Oil temperature > 105 °C

Coasting shutoff
Coasting shutoff in the DME is prevented if the temperature mixing flaps are more than 90% open.

Fault memory
If "Fault not present" is displayed, this may be caused by a poor terminal connection. If this is the case, check the fault path for poor connections, clear the fault memory and test drive the vehicle. If the fault occurs again, replace the components affected.

If the fault does not occur again, it may be assumed that it was just an intermittent fault.

Switching on the A/C compressor
The compressor is not switched on until 10 seconds after the A/C system has been switched on.

Switching on the condenser blower
The condenser blower is not switched on until 10 seconds after the A/C system has been switched on.