Functions in the door mirrors

The functions in the door mirrors (6/62 left) (6/63 right) which are controlled from the driver door module (DDM) (3/126) or passenger door module (PDM) (3/127) are: mirror position adjustment, folding in the mirrors, mirror heating, local lighting/guide lighting, and temperature measurement.

Adjusting the mirror position

Fig 1: Identifying Mirror Position Adjusting Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The position of the mirror is controlled using buttons on the driver door module (DDM) (3/126). The driver door module (DDM) transmits a signal directly to the mirror on the driver's side (6/62). When adjusting the mirror on the passenger side (6/63), a signal is transmitted from the driver door module (DDM) to the passenger door module (PDM) (3/127) on the Controller area network (CAN).

If the car has power seats with memory for the door mirrors, the position of the mirrors is stored by two potentiometers. The signal indicating the position in the X and Y axes is received by the driver door module (DDM) and passenger door module (PDM). When one of the buttons on the control unit for the power seat is activated, a signal is transmitted from the power seat module (PSM) (4/52) to the driver door module (DDM) and passenger door module (PDM). This adjusts the door mirrors to the stored position. The stored position can also be set according to which remote control is used to unlock the car.

There is more detailed information about this function in Design and Function, power seat module (PSM).

Folding in the door mirrors

Fig 2: Identifying Door Mirrors Folding Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Mirror folding is activated via the switch for folding door mirrors (3/171), which is on the climate control module (CCM) (3/112). A signal is transmitted via the Controller area network (CAN) to the driver door module (DDM) (3/126) and passenger door module (PDM) (3/127). These in turn send the signal on to each door mirror (6/62 and 6/63), which fold each mirror in or out. There is a delay between the button being pressed and the door mirrors folding in or out.

Heating the mirrors

Fig 3: Identifying Mirrors Input Heating And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Mirror heating is activated at the same time as the rear windshield defroster. When the switch for rear demist/mirror demist (3/8) is pressed, the climate control module (CCM) (3/112) transmits a signal to the central electronic module (CEM) (4/56). The central electronic module (CEM) activates the rear demist and transmits a signal to the driver door module (DDM) (3/126) and passenger door module (PDM) (3/127) to activate mirror heating. When the driver door module (DDM) and passenger door module (PDM) receive the signal, the outputs for each door mirror are powered (6/62 and 6/63). The function is switch off at the same time as the rear demist. This can happen in three different ways:

If the switch for rear demist/mirror demist is pressed again after activation the function is switched off, using a signal from the central electronic module (CEM)
The heating switches off automatically 12 minutes after activation. The driver door module (DDM) and passenger door module (PDM) then receive a signal from the central electronic module (CEM) requesting that the function be deactivated
The heating is also switched off if the ignition is switched off.

Local lighting/Guide lighting

Fig 4: Identifying Local Lighting/Guide Lighting Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The local lighting is activated using the remote control for the car. The function can only be activated when the ignition is off. When the yellow button on the remote control is pressed, the upper electronic module (UEM) (4/70) receives an activation signal which is sent onwards on the Controller area network (CAN). The driver door module (DDM) (3/126) and passenger door module (PDM) (3/127) receive the signal and switch on the lighting for the left door mirror (10/148) and the lighting for the right door mirror (10/149). The function is deactivated by pressing the button on the remote control again. A signal is then sent from the upper electronic module (UEM) to the driver door module (DDM) and passenger door module (PDM) requesting that the function is switched off. The function is also switched off when the ignition is switched on.

The guide lighting is activated using the left-hand control stalk (the key must be removed from the ignition switch). The steering wheel module (SWM) (3/130) then transmits a signal via the controller area network (CAN) to the central electronic module (CEM) (4/56). When the car is then locked, the central electronic module (CEM) sends a signal onwards via the controller area network to the driver door module (DDM) (3/126) and passenger door module (PDM) (3/127), which turn on the lights in the door mirrors (10/148 and 10/149). The lights are part of the guide lighting function and remain on for a set time (30, 60 or 90 seconds).

Measuring the outside temperature

Fig 5: Identifying Outside Temperature Measuring Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The outside temperature is continuously measured (in ignition positions I and II) by the outside temperature sensor (7/11), which is always in the right-hand door mirror. The analog signal is received by the passenger door module (PDM) (driver door module (DDM) for right-hand drive cars). The signal is converted to a digital signal. This signal is then transmitted on the controller area network (CAN) and used by the central electronic module (CEM) (4/56), which sends the signal on to the driver information module (DIM) (5/1).