Checking the diagnostic trouble codes (DTCs)

Check which of the following alternatives apply when reading off diagnostic trouble codes (DTCs) for the climate control module (CCM).

Alternative 1 

If the diagnostic trouble code (DTC) is stored with one or more other diagnostic trouble codes (DTCs), and the diagnostic trouble code (DTC) for direction control, this indicates a fault in the matrix network governing direction control.

The damper motors are connected in series in the matrix network governing direction control. In the event of a fault in the network, a diagnostic trouble code (DTC) will be stored for all damper motors which are in motion at the same time.

The following are probable fault causes:

• short-circuit between the wiring in the matrix network
• short-circuit to supply voltage
• short-circuit to ground
• damaged damper motor.

Check to see if the diagnostic trouble code (DTC) has been stored with any of the following diagnostic trouble codes (DTCs):

• CCM-0011

  Refer to Checking the wiring 

• CCM-0012

  Refer to Checking components and wiring 

• CCM-0014
• CCM-0015
• CCM-0016
• CCM-0017
• CCM-0018

Alternative 2 

Check whether the diagnostic trouble code (DTC) has only been stored with the diagnostic trouble codes (DTCs) for direction control, CCM-0017 and CCM-0018.