Diagnostic trouble code (DTC) information CCM-0004

Condition 

The diagnostic trouble code (DTC) is stored if the climate control module (CCM) detects an open-circuit in the signal between the climate control module (CCM) and the passenger compartment temperature sensor, or a short-circuit to supply voltage in the signal.

The climate control module (CCM) uses the signal to control the passenger compartment temperature.

The diagnostic trouble code (DTC) can be diagnosed in ignition positions I and II.

The diagnostic trouble code (DTC) can only be diagnosed for the electronic climate control module (CCM) (ECC).

Substitute Value 

• The control module adopts a substitute value corresponding to 25 °C
• The normal value is the passenger compartment temperature.

Possible Source 

• There is a short-circuit to supply voltage in the signal between the passenger compartment temperature sensor and the climate control module (CCM)
• Open-circuit in the signal between the passenger compartment temperature sensor and the climate control module (CCM)
• Contact resistance, oxidation or loose connections in the connectors
• The passenger compartment temperature sensor is not functioning.

Fault symptom[s] 

• The passenger compartment temperature does not correspond to the set position.