Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CCM-U030000

Condition
The control modules communicate with each other for exchange of information in a network via a standardized serial communication procedure - CAN (Controller Area Network). The Central electronic module (CEM) regularly transmits messages on the CAN network. These messages contain information about which signal configuration ID applies to the vehicle. The control modules on the CAN network have the same signal configuration ID so that they can communicate with each other.
The control module compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The control module's configuration ID differ from the ID that the Central electronic module (CEM) transmits.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Starting the control module's CAN communication.

Note! When the diagnostic trouble code is generated, the control module answers to the diagnostic commands, however, the normal CAN-communication does not work ("Expulsion-mode").





Substitute value
- The control module stops transmitting messages on the CAN network.
- The control module's functions stop working.

Possible source
- Incorrect configuration ID (the control module is not intended for this vehicle, for example it is a used control module with different software/hardware).
- Intermittent open-circuit in one or both CAN cables in part of the network. In the event of an open-circuit in both the control area network (CAN) cables, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.

Fault symptom[s]
- Climate control does not work