Rear View Mirrors - Rear View Mirrors - System Operation and
Component Description
Mondeo 2007.5 (02/2007-)
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Description and Operation
Control Diagram
Auto-dimming Interior Mirror
Description
GEM (generic electronic module)
Reversing lamp switch
Comments:
Vehicles With Manual Transmission
TCM (transmission control module)
Comments:
Automatic Transmission
Battery
BJB (battery junction box)
Interior mirror
DLC (data link connector)
Exterior mirror(s)
Description
GEM
Reversing lamp switch
Comments:
Vehicles With Manual Transmission
TCM
Comments:
Automatic Transmission
Exterior mirror operating switch unit
Refer to Component Description: Operating switch unit, exterior mirror
Comments:
Part of the driver door operating switch unit
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Battery
BJB
RJB (rear junction box)
Passenger door module
Driver Door Module
Exterior mirror, right
Exterior mirror, left
DLC
Comments:
Connected via mid- and high-speed
CAN (controller area network)
bus
System Operation
Some of the functions of the interior and exterior rear view mirrors require that the reverse gear signal is activated. For vehicles with automatic
transmission, the reverse gear signal is sent from the
TCM
via the
CAN
bus to the
GEM
. On manual transmission models the reverse gear signal is provided
by a transmission switch that is hardwired to the
GEM
.
Auto-dimming Interior Mirror
The automatic dimming mechanism comprises an electrochromatic mirror glass, the control as well as the forwards and backwards directed light sensors.
The forward facing light sensor monitors the ambient light level at the front of the vehicle; the rearward facing light sensor monitors the light level coming
from the rear of the vehicle. If the light falling in from the rear is higher than that from the front, the interior rear view mirror is automatically dimmed. The
control for the automatic dimming mechanism is integrated in the mirror housing.
The automatic dimming mechanism is active, if the ignition switch is in position I or II.
At the foot of the mirror is a 3-pin connector, which makes a hard-wired connection with the
CJB (central junction box)
via the roof wiring harness. This
wiring provides a ground connection, the power supply and the reverse gear signal.
The relay R7 in the
BJB
is acted upon by a continuous voltage. When switching the ignition switch to position I or II, the relay R7 is switched by the
GEM
. As
a result, the interior rear view mirror is supplied with power via fuse F41 in the
BJB
and the
GEM
is also supplied with power. The ground connection is
provided by a ground point on the right A-pillar.
The reverse gear signal is necessary so that the dimming function is deactivated when reverse gear is selected. To do this the
GEM
supplies the reverse
gear signal input to the interior rear view mirror.
Electric exterior mirror(s)
For diagnostics, an error code can be read via the
DLC
for further diagnostics.
NOTE: If the mirrors are frequently activated within a short period of time, then the system can temporarily inactivate itself to prevent overheating.
If during folding in and out of the exterior mirrors further functions are activated, their implementation is delayed until the folding process is complete.
Control of the exterior mirrors takes place using the respective door module in the driver or passenger door. To do this the door module uses the signals of
the exterior mirror operating switch unit and the reverse gear signal. The reverse gear signal activates the inclining of the exterior mirror when reverse gear
is engaged. The inclination angle can be changed and saved. Saving occurs in the appropriate door module.
NOTE: Automatic exterior mirror adjustment for driving in reverse is only available if the function is activated in the instrument cluster and the vehicle has
a memory function.
Programming the exterior mirror inclination angle for driving in reverse
Set the ignition switch to the II position
select the desired exterior mirror
Engage reverse gear
Set the desired mirror inclination
More the gearshift out of the reverse gear setting. The setting is automatically saved
NOTE: The electric exterior mirrors can be adjusted if the ignition switch is in position II or for a period of several minutes after switching off the ignition.
They are immediately switched off, as soon as a door is opened.
The
RJB
applies a voltage to the driver door module via fuse FA1 and to the passenger door module via fuse FA2. A ground point on the driver-side A-pillar
provides a ground connection for the driver door module. The ground point for the passenger door module is on the passenger-side A-pillar.
Voltage is applied to the exterior mirror operating switch via fuse F17 through the integrated relay in the
GEM
for the interior lighting/battery preserving
function. The ground connection is provided by a ground point on the left A-pillar.
Switch positions for the exterior mirror operating switch unit
Description
Switch - folding function
Switch - right/left exterior mirror
Comments:
Switch settings: right, OFF, left
Switch, exterior mirror adjustment
Comments:
Switch settings: high/low, right/left
If the ignition switch is set to position II, then a relay integrated in the
GEM
applies a voltage to the exterior mirror operating switch unit. In addition this
relay controls the power supply to the interior lighting and the battery preserving function. The operating switch unit communicates with the door modules
via the
LIN (local interconnect network)
bus.
The driver and passenger door modules are connected via the medium speed
CAN
bus.
Mode of operation of the mirror functions
Exterior mirror folding in/out
The folding function is always completed before any other mirror adjustments can be started.
If the switch folding function or the door locking radio remote control is activated, then the exterior mirror operating switch unit sends a
LIN
bus signal to
the driver and passenger door modules. The door modules request the current exterior temperature and system voltage via the
CAN
bus. This information is
required for calculating the permissible motor loading. After calculation the door modules apply a voltage to the motors for the folding function. The folding
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motors fold the exterior mirrors in or out. If the folding function switch is pressed again during folding in or out, then the motors remain running and run in
the opposing direction. The door modules affect this change in direction by reversing the motor polarity.
Reaching of the end position by the exterior mirror is identified by measuring the amplitude of current applied to the motor. An increase in the current
amplitude or exceeding of the specified threshold is evaluated as the reaching of the end position. Power supply is interrupted. To protect the motor, a
running time limit is defined and a circuit tester provided. The running time limit is set by default to 20 seconds, but can also be set via the diagnostics unit
to any time between 0 and 30 seconds. If the circuit tester does not deliver a result within 2.5 seconds, the motor is turned off.
Inclining and turning the mirror glass
The maximum adjustment angle for inclining and turning is 25 °.
Exterior mirror adjustment is active, if the switch - right/left exterior mirror has been switched to the right or left. The driver or passenger door module is
activated dependent on the switch setting. If the switch is in the central position, the function is not available.
If the exterior mirror adjustment switch is pressed, the exterior mirror operating switch unit sends a
LIN
bus signal to the activated door module. The
door module assesses the received signal and applies power to the motor to incline or turn the exterior mirror. The door module changes the direction of
movement by reversing the motor polarity.
Automatic, driver dependent, mirror glass adjustment - memory function
For vehicles with memory function, the exterior mirror setting is saved for each radio remote control. The storage location for these settings is the
GEM
.
The inclining and turning motors are equipped with position sensors for determination of the instantaneous mirror glass position. The position sensors
comprise potentiometers.
Memory function automatic exterior mirror adjustment is NOT available or is interrupted if one of the position sensors does not supply a signal, or if either
of the exterior mirror adjustment or driver seat adjustment switches is activated.
If the vehicle is opened using radio remote control, the
GEM
sends the settings saved for the radio remote control while the instrument cluster sends the
radio remote control identifier over the
CAN
to the door modules. The door modules evaluate the received signals and apply voltages to the motors to
incline or turn their respective exterior mirrors so that these move to the required positions. The door module changes the direction of movement by
reversing the motor polarity.
Automatic exterior mirror adjustment for driving in reverse
Automatic exterior mirror adjustment is available for driving in reverse, if the switch - right/left exterior mirror has been switched to the right or left. The
driver or passenger door module is activated dependent on the switch setting. If the switch is in the central position, the function is not available.
Automatic exterior mirror adjustment is NOT available for driving in reverse, if the right/left exterior mirror switch is in the central position or one of the
position sensors is not outputting a signal.
If reverse gear is engaged, the
GEM
sends a
CAN
bus signal to the door module. The door module assesses the received
CAN
bus signal and applies power
to the motors to incline and turn the exterior mirror. The mirror glass is inclined and turned until it reaches the preset inclination angle. If required, the
preset inclination angle can be changed.
The inclining and turning motors are equipped with position sensors for determination of the instantaneous mirror glass position. The position sensors
comprise potentiometers.
The exterior mirrors return to the start position, if the vehicle is driven in a forwards direction at faster than 7 km/h or approximately 10 seconds after the
shift lever has been moved out of the reverse gear position or the right/left exterior mirror switch is switched to its central position. If reverse gear is
reselected within 10 seconds or the driving speed reduced to7 km/h or less, then the mirrors remain in their instantaneous positions or move back to the
preset positions.
Mirror glass heating
The door modules apply power to the exterior mirror heating elements as soon as the ignition switch is turned to position II.
The heating element uses a shared ground connection with the side indicators and the door entry light.
Component Description
Operating switch unit, exterior mirror
NOTE: The exterior mirror operating switch unit is integrated in the driver door operating switch unit.
Switch types used
The switch for the folding function is a simple push-button
The switch for switching between right and left mirrors is a ratchet switch with 3 ratchet positions
The switch for exterior mirror adjustment is a double rocker switch
The switch signals of the exterior mirror operating switch unit are converted by a module in the driver door operating switch unit into
LIN
bus signals.
Adjustment motors
The adjustment motors for the exterior mirror functions are DC motors.
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