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.

Rear electronic module (REM) 

Rear electronic module (REM) can identify 12 different faults associated with the central locking system and can store up to 10 diagnostic trouble codes (DTCs) simultaneously.

Driver door module (DDM) 

Driver door module (DDM) can identify 20 different faults associated with the central locking system and can store up to 10 diagnostic trouble codes (DTCs) simultaneously. For further information, see DRIVER DOOR MODULE (DDM) AND PASSENGER DOOR MODULE (PDM) (2001-2007) .

Passenger door module (PDM) 

Passenger door module (PDM) can identify 20 different faults associated with the central locking system and can store up to 10 diagnostic trouble codes (DTCs) simultaneously. For further information, see DRIVER DOOR MODULE (DDM) AND PASSENGER DOOR MODULE (PDM) (2001-2007) .