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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