The Power Window Mechanism

Fig 1: Identifying Driver Door Module (DDM) / Passenger Door Module (PDM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The window lift mechanism on the driver's side is operated via the control panel in the driver's door. The window lift mechanism on the passenger side is operated either via the control panel in the passenger door or via the control panel in the driver's door.

The rear power windows can be operated via the control panel in the driver's door or via the Left rear door module (LDM) or Right rear door module (RDM). The power windows can be operated when the ignition key is in position I or II. The power windows can also be operated from when the ignition is switched off until one of the front doors is opened.

The control panel in the driver's door has four spring loaded switches which operate the individual windows

The control panels in the passenger door, left rear door and right rear door each have a spring loaded switch to operate the relevant power window.

The switches for the window lift mechanisms in all doors have five positions which control the position of the window:

0) Normal position where the function is passive.

1) step 1 upwards, raises the window for as long as the button is activated.

2) step 2 upwards, automatically fully closes the window (AUTO-UP).

-1) step 1 downwards, lowers the window for as long as the button is activated.

-2) step 2 downwards, fully opens the window automatically (AUTO-DOWN).

Instead of child lock switch:

This switch has three positions that control:

Normal position where the function is passive.
Down, automatically operates all windows down (AUTO-DOWN).
UP, operates all windows up as long as the button is held in.

The rear window lift mechanisms can be switched off using a child lock switch in the control panel in the driver's door. When the child lock is activated, the rear windows cannot be operated from the rear seats. However, the rear windows can still be operated from the control panel in the driver, s door.

The window lift mechanisms have a hall sensor which measures the rotation speed of each lift mechanism, allowing the mechanisms to determine the position of the window. If a Hall sensor is not functioning in one of the window lift mechanisms, the AUTO-UP or AUTO-DOWN function for that window is not available.

In all the doors the power window lift mechanism, power window lift motor and Hall sensor and control module form one unit and cannot be replaced separately.

All power window lift mechanisms in the front doors have an integrated function to prevent trapping.

A diagnostic trouble code (DTC) is stored if for any reason the power window mechanism is unable to determine the window position. If this should happen, the power window mechanism must be re-initialized. This is carried out via a diagnostic function in VIDA (Volvo scan tool).

The passenger door module (PDM) and driver door module (DDM) have diagnostics for the window lift mechanisms and Hall sensors in the front doors.

The window lift mechanisms and Hall sensors in the rear doors can be diagnosed via the control modules in the front doors on the relevant side of the vehicle.