Diagnostic Functions

Diagnostic functions

General
The control modules have a built-in diagnostic system, Volvo Diagnostics, which continuously monitors internal functions as well as input and output signals. The central locking system is a distributed system which stores diagnostic trouble codes (DTCs) in different control modules depending on where the fault occurred.

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.
For further information, see Design and Function, central electronic module (CEM).
Keyless vehicle module (KVM)
The keyless vehicle module (KVM) can identify 34 different faults in the keyless entry system.
For further information, see Design and Function, keyless vehicle module (KVM).
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) depends on whether the car is left or right-hand drive.
For further information, see Design and Function, door control modules.
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) depends on whether the car is left or right-hand drive.
For further information, see Design and Function, door control modules.
Convertible Roof Module (CRM)
The control module can identify 1 fault related to the central locking system.

Description of programmable parameters, customer adaptation
There are two ways of carrying out customer adaptation:
- via the infotainment control module (ICM)
- via VIDA.
The parameters which can be changed are described in the table below.