Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Sun Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) CCM-0008 is stored if the control module registers that the signal from the sun sensor is above 98% of supply voltage (approximately 5 V).

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 approximately 20% (200 W/m² ) of maximum solar heat.

Possible Source 

• Contact resistance, oxidation or loose connections in the connectors
• Open-circuit in the signal cable between the control module and the sun sensor
• Short-circuit to supply voltage in the signal cable between the control module and the sun sensor
• Short-circuit to supply voltage in the ground lead between the control module and the sun sensor
• Open-circuit in the ground lead between the control module and the sun sensor
• Defective sun sensor.

Fault symptom[s] 

• The passenger compartment temperature is not reduced when sun intensity is high.