Diagnostic Trouble Codes (DTCS)

A diagnostic trouble code (DTC) is stored if a control module detects a fault in a connected component.

If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in a control module, information about the fault remains in the control module.

Central electronic module (CEM) 

The central electronic module (CEM) can identify 39 different faults related to the central locking system and is able to store up to 10 diagnostic trouble codes (DTCs) at the same time.

Driver door module (DDM) 

The driver door module (DDM) can identify 20 different faults related to the central locking system and is able to store up to 10 diagnostic trouble codes (DTCs) at the same time. The control module also stores diagnostic trouble codes (DTCs) for its corresponding rear door control module. The rear door control module for which the driver door module (DDM) stores diagnostic trouble codes (DTCs).

Passenger door module (PDM) 

The passenger door module (PDM) can identify 20 different faults related to the central locking system and is able to store up to 10 diagnostic trouble codes (DTCs) at the same time. The control module also stores diagnostic trouble codes (DTCs) for its corresponding rear door control module. The rear door control module for which the passenger door module (PDM) stores diagnostic trouble codes (DTCs).

Convertible Roof Module (CRM) 

The control module can identify 1 fault related to the central locking system.