The Power Window Mechanism

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

Courtesy of VOLVO CARS CORPORATION

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) (only the driver's door for the C70). 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 (only applies to the front windows in the C70):

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:

In the C70 the control panel in the driver's door is equipped with a button, which operates all windows up or down.

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.

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

Only the front power windows in the C70 have the integrated function to prevent trapping. When AUTO-UP is activated, the window lift mechanism detects whether there is any resistance, i. e. whether too much force is required to close the window. If so, the window stops and then lowers slightly. The anti-trapping system is active during AUTO-UP if the window is open more than 3 mm.

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.