System Overview

System overview

Front door control modules




The driver door module (DDM) and the passenger door module (PDM) are broadly similar in terms of functionality. Both these control modules are described in common in this document. In those cases the differences between the driver door module (DDM) and the passenger door module (PDM) are given. The main task of both control modules is to manage:
- the power window mechanism
- the door lock
- door mirror adjustment
- door mirror folding
- door mirror heating
- approach lighting
- turn signal lamps in the door mirrors.
The control modules are in their respective doors. The driver door module (DDM) is on the driver's side. The passenger door module (PDM) is on the passenger side. The control modules are integrated with the power window lift motors. The control modules must also be replaced when replacing the power window lift motors.
There are two types of control module, Standard and High. The difference between the variants is that Standard does not have deadlocks, memory function for the mirrors (only S40/V50 2004 and C70) or approach lighting.
The driver door module (DDM) and passenger door module (PDM) communicate with directly connected components and with other control modules and components connected via controller area network (CAN).
The driver door module (DDM) and passenger door module (PDM) communicate with the control module for the rear doors for their respective sides of the vehicle via LIN communication.
Both control modules check activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if either of the control module detects a fault. The diagnostic trouble codes (DTCs) for the control modules in the rear doors are stored in the respective control module in the front doors.
Any diagnostic trouble codes (DTCs) are stored in the relevant control module memory. The data can be read off.
A simple way to ensure that the control modules are powered and grounded is to activate one of the functions that are operated via the switches on the control panels in the respective doors. The control module is powered and grounded if any of the functions are working.
For further information, also see Signal specifications.

Control modules in rear doors (S40/V50) / under rear side window (C70)




Left rear door module (LDM) and Right rear door module (RDM) are completely the same and only manage the functions for power windows and door locks in their respective door (door locks do not apply to C70).
The control modules are positioned in their respective doors (in the C70 they are located under the respective rear side window). The control modules are integrated with the power window lift motors. The control modules must also be replaced when replacing the power window lift motors.
There are two types of control module, Standard and High. The difference between the variants is that Standard does not have deadlocks or child-proof locks. (child-proof locks does not apply to the C70).
The left rear door module (LDM) and right rear door module (RDM) communicate with directly connected components and with the control module for the front door on the relevant side of the vehicle via LIN-communication.
Both control modules check activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if either of the control module detects a fault. The diagnostic trouble codes (DTCs) for the control modules in the rear doors are stored in the respective control module in the front doors.
Any diagnostic trouble codes (DTCs) are stored in the relevant control module in the front doors. The data can be read off.
A simple way to ensure that the control modules are powered and grounded is to activate one of the functions that are operated via the switches on the control panels in the respective doors. The control module is powered and grounded if any of the functions are working.
For further information, also see Signal specifications.

Signals
The table below summarizes the input signals to and output signals from the driver door module (DDM) and passenger door module (PDM). The signal types are divided into directly connected signals, LIN and CAN communication. The illustration below displays the same information with the Volvo component designations.