Diagnostic Trouble Code (DTC) Information CCM-DD20

Condition 

The diagnostic trouble code (DTC) is stored if the climate control module (CCM) detects that data that is sent on LIN bus 2 is incorrect.

The following components communicate with the climate control module (CCM) via LIN bus 2:

• damper motor module (DMM) defroster
• damper motor module (DMM) temperature right (only ECC)
• damper motor module (DMM) recirculation (only on left-hand drive cars)
• air quality sensor (AQS) (only on left-hand drive cars)
• seat heating module (SHM) right.

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

Substitute Value 

• None.

Possible Source 

• Incorrect data during communication on LIN bus 2.

Fault symptom[s] 

• Misting on the windows and/or door mirrors.
• Air flow problem.
• Poor heating in the passenger compartment.
• The front seat heating does not function.
• Poor air quality in the passenger compartment.