Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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