Module Controlled Functions – Overview
Generic electronics module (GEM)
CAUTIONS:
Never swap the GEM (generic electronic
module) between two vehicles.
Compare the number of relays and fuses
in the defective GEM and the new GEM.
Transfer from the defective GEM any relays
and fuses which are not in the new GEM.
In doing so, pay attention that fuses with
the correct Ampere rating are used, by
referring to the wiring diagrams.
NOTE: The GEM is integrated in the CJB (central
junction box) and cannot be replaced as a separate
unit.
For repair work during a service, vehicle-specific
configuration is necessary if a new GEM is
installed.
Emergency function
The GEM is equipped with restricted emergency
running functions on vehicles with mid or high-end
equipment levels.
The microcontroller sends a control signal to a
monitoring function within the GEM at regular
intervals. If the battery voltage falls below a value
of approx. 7.5 volts, this check signal is not present
and the GEM switches to emergency function after
a predetermined time.
In this case, the low beam is permanently switched
on, regardless of the light switch position. The
windshield wiper can only be operated in stage 1;
the wiper switch must however be in the stage I or
II position. The wiper park position is not
recognized. Intermittent wiping is not available.
When the control signal recurs, the GEM switches
back to normal operation.
Service mode
Description of operation
Diagnosis of the GEM can be carried out using the
Ford diagnostic unit. Furthermore, an integrated
service mode enables testing of the input and
output signals without the need for further tools.
To enable activation of service mode: • switch off the ignition,
• switch off all other electrical consumers,
• apply the handbrake,
• Shift to neutral
• and close the doors.
Activating the service mode
NOTE:
If the alarm is activated (in vehicles fitted
with an anti-theft alarm system), service mode
cannot be activated.
Proceed as follows to activate the service mode:
• OPERATE the switch of the heated rear window
and HOLD IT THERE
• SWITCH ON the ignition.
• RELEASE the switch of the heated rear window
A signal sounds and the turn signal lamps come
on to indicate that service mode has been
successfully activated.
Inputs
SWITCH the windshield wiper switch to the "OFF"
position to test the input signals. The following is
a list of the switch signals to be tested, in no
particular order:
• Windshield wiper stage I
• Windshield wiper stage II
• Windshield washer system
• Rear window wiper
• Rear window washer system
• Doors open/closed
• Remote control for central locking with double locking
• Hood open/closed (in vehicles equipped with an anti-theft alarm system)
• Tailgate open/closed
• A/C request signal
• Heated windscreen (if fitted)
• Parking brake
• Brake fluid level
• Cruise control system
• Autolamps
• Dipped beam
• Main beam
• Headlamp flasher
• Side lights
• Turn signals (right, left, hazard warning lights) G1030787en
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• Reversing lamp
• Liftgate release
• Folding liftgate release
• Ignition switch, terminal 15 (turn key to 0
position, then turn key to II position.)
An acoustic signal sounds and the turn signal
lamps flash to indicate receipt of each input signal
by the generic electronic module.
Test the windshield wiper "intermittent mode"
stage input signal (only vehicles with adjustable
intermittent mode):
The windshield wiper switch must be switched to
"intermittent mode" in order to test the input signal.
The delay times of the input signals can then be
tested by operating the rotary switch. Each change
of the rotary switch position is indicated by an
acoustic signal and illumination of the turn signals.
Output signals
SWITCH the wiper switch to the "Intermittent"
position to test the output signals. PRESSING the
heated rear window switch activates the output
signals in the following order:
• Left-hand turn signal
• Right-hand turn signal
• Main beam
• Dipped beam
• Windshield wiper stage I
• Windshield wiper stage II
• Heated rear window
• Heater blower motor
• Headlamp washer system (vehicles with HID headlamps)
• Electric booster heater (if fitted)
• Autolamps (if fitted)
• Alarm horn (vehicles with alarm system)
• Rear window wiper
• Heated rear window relay
When the heated rear window switch is pressed
again, the test of the relevant signal is terminated.
When the heated rear window switch is pressed
once more, the test for the next signal in the list is
started.
Ending the service mode
The GEM automatically ends service mode 20
seconds after the last input or at a driving speed
of over 7km/h. However, service mode can be
manually ended at any time by proceeding as
follows: •
OPERATE the switch of the heated rear window
and HOLD IT THERE
• Switch off the ignition.
• RELEASE the switch of the heated rear window
3 signals sound and the turn signal lamps illuminate
to indicate that service mode has ended.
Resetting service mode
If, after completion of service mode, some functions
do not operate or do not operate properly, check
the following functions:
• Instrument cluster illumination, side marker lamps (side lights) and licence plate lamp in
automatic headlamps mode
• Rear wiper
• Headlamp washer assembly
• Electric booster heater
• Alarm horn
• Heated windshield
If one or more of the listed functions is not OK, it's
possible that the cause of the fault is due to not
exiting service mode properly. To reactivate the
functions correctly, perform the following steps:
1. Switch off the ignition.
2. SWITCH OFF the switch for the windscreen wash/wipe system
3. OPERATE the switch of the heated rear window
and HOLD IT THERE
4. SWITCH ON the ignition.
5. RELEASE the heated rear window switch (an acoustic signal will sound if activation has been
performed correctly)
6. SWITCH the windscreen wash/wipe switch to the "Intermittent wipe" position
7. OPERATE the heated rear window switch 6 times (the main beam headlamps switch on and
off automatically)
8. SWITCH OFF the switch for the windscreen wash/wipe system
9. OPERATE the switch of the heated rear window
and HOLD IT THERE
10. Switch off the ignition.
11. RELEASE the heated rear window switch (three
acoustic signals will sound if activation has been
performed correctly)
After completion of the work, check all the
functions. G1030787en
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Electrical consumers are switched off when the
battery voltage is low if the GEM determines (as a
result of the message received from the PCM on
the CAN bus via the instrument cluster) that the
battery voltage has dropped below the threshold
value.
When the threshold for low battery voltage is
reached the GEM switches off the following
consumers in this order at intervals of 5 seconds:
• Heated windscreen
• Heated rear window
• Electric booster Heater
• A/C system
If the battery voltage increases back above the
lower threshold then all of the consumers which
were previously switched off are reactivated by the
GEM.
Once the electric consumers have been reactivated
their status is "switched off", i.e. the consumers
are switched off and await an input signal provided
from the relevant switch via the GEM; this means
that the driver needs to switch these components
back on again.
Electrical consumers are switched on when the
battery voltage is excessively high if the GEM
determines that the battery voltage has increased
above the threshold for overvoltage and the
charging system warning indicator has come on.
When the threshold is reached the GEM switches
on the following consumers in this order at intervals
of 5 seconds:
• Heated windscreen
• Heated rear window
When these components are deactivated again
their status is "switched off". This means that the
consumers are waiting for an input signal provided
from the relevant switch via the GEM.
Ignition overload protection
The ignition overload protection intermittently
disconnects certain circuits in order to restrict the
current being drawn from the battery while the
starter motor is operating.
The position of the ignition switch is broadcast by
the instrument cluster on the medium speed CAN
bus.
The ignition overload protection relay which is
integrated in the battery junction box is activated
by the GEM if the message "ignition switch in
position III" is received from the instrument cluster.
All of the electric consumers controlled by the
ignition overload protection relay are then switched
off.
The following consumers (among others) are
controlled by the ignition overload protection relay:
• Fog lamps
• Windscreen/rear window wash/wipe systems
• Backup lamps
• Heated washer nozzles
• Heating blower motor
• Seat heating
Headlamp switch-off delay
The headlamp switch-off delay utilizes the low
beam together with the peripheral lights (if
equipped) to illuminate the area surrounding the
vehicle. The function is activated by operating the
high beam lever when the ignition switch is in the
"0" position.
After the last door has been closed, the function
remains active for a further 30 seconds and then
switches off automatically.
When a door or the tailgate is open, the switch-off
time is extended to 180 seconds. After the last door
has been closed, the switch-off time is reset to 30
seconds.
The headlamp switch-off delay can be deactivated
prematurely by operating the high beam lever again
or by switching on the ignition.
The switch-off time is adjusted to set values at the
factory and cannot be re-programmed using the
Ford diagnostic unit.
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Generic Electronic Module (GEM)
Refer to Wiring Diagrams Section 419-10, for
schematic and connector information.
Special Tool(s) / General Equipment
Terminal Probe Kit
418-S035Digital multimeter
Ford approved diagnostic tool
Description of operation
A diagnosis of the generic electronic module (GEM)
can be performed with the Ford approved
diagnostic tool. Furthermore, an integrated service
mode enables testing of the input and output
signals without the need for further tools. To enable
activation of service mode:
• Switch off the ignition
• Switch off all other electrical consumers
• Apply the handbrake
• Shift to neutral
• Close the doors.
Activate service mode
Proceed as follows to activate service mode:
• PRESS and HOLD the switch of the heated rear
window
• SWITCH ON the ignition.
• RELEASE the switch of the heated rear window
A signal sounds and the turn signal lamps
illuminate to indicate that service mode has been
successfully activated.
NOTE: If the alarm is armed (in vehicles fitted with
an anti-theft alarm system), service mode cannot
be activated.
Input signals
SWITCH the windshield wiper switch to the "Off"
position to test the input signals. The following is
a list of the switch signals to be tested, in no
particular order: • Turn signals (right, left, hazard warning lights)
• Windshield wiper stage I
• Windshield wiper stage II
• Windshield washer system
• Rear window wiper
• Rear window washer system
• Doors open/closed
• Door key cylinder set/reset switch
• Remote control for central locking with double
locking
• Hood up/down (in vehicles fitted with anti-theft alarm system)
• Tailgate open/closed
• Mini liftgate open/closed
• Manual A/C request signal
• Manual AUX heater request signal
• Heated windshield (if fitted)
• Parking brake
• Brake fluid level
• Cruise control system
• Autolamps
• Dipped beam
• Main beam
• Headlamp flasher
• Side lights
• Reversing lamp
• Tailgate release
• Mini liftgate release
• Interior scanning system
• Ignition switch, terminal 15 (turn key to 0 position, then turn key to II position.)
An acoustic signal sounds and the turn signal
lamps flash to indicate receipt of each input signal
by the generic electronic module.
Test the windshield wiper "intermittent mode" stage
input signal (only vehicles with adjustable
intermittent mode)
The windshield wiper switch must be switched to
"intermittent mode" in order to test the input signal.
The delay times of the input signals can then be
tested by operating the rotary switch. Each change
of the rotary switch position is indicated by an
acoustic signal and illumination of the turn signals. G1055084en
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Output signals
SWITCH the wiper switch to the "intermittent""
position to test the output signals. PRESSING the
heated rear window switch activates the output
signals in the following order:
a.
Left-hand turn signal
b. Right-hand turn signal
c. Main beam
d. Dipped beam
e. Windshield wiper stage I
f. Windshield wiper stage II
g. Heated rear windshield
h. Heater blower motor
i. Headlamp washer system (vehicles with HID headlamps)
j. Electric booster heater (if fitted)
k. Autolamps (position lamps only if fitted)
l. Alarm horn (vehicles with alarm system)
m. Rear window wiper
n. Heated front window relay
When the heated rear window switch is pressed
again, the test of the relevant signal is terminated.
When the heated rear window switch is pressed
once more, the test for the next signal in the list is
started.
End service mode
The GEM automatically ends service mode 20
seconds after the last input or at a driving speed
of over 7km/h. However, service mode can be
manually ended at any time by proceeding as
follows:
• PRESS and HOLD the switch of the heated rear
window
• SWITCH OFF the ignition.
• RELEASE the switch of the heated rear window
3 signals sound and the turn signal lamps illuminate
to indicate that service mode has ended.
Reset service mode
If, after completion of service mode, some functions
do not operate or do not operate properly, check
the following functions:
• Instrument cluster illumination, side marker lamps (side lights) and licence plate lamp in
automatic headlamps mode
• Rear wiper
• Headlamp washer assembly
• Electric booster heater • Alarm horn
• Heated windshield
If one or more of the listed functions is not OK, it's
possible that the cause of the fault is due to not
exiting service mode properly. To reactivate the
functions correctly, perform the following steps:
1. Switch off the ignition.
2. SWITCH OFF the switch for the windscreen
wash/wipe system
3. OPERATE the switch of the heated rear window
and HOLD IT THERE
4. SWITCH ON the ignition.
5. RELEASE the heated rear window switch (an acoustic signal will sound if activation has been
performed correctly)
6. SWITCH the windscreen wash/wipe switch to the "Intermittent wipe" position
7. OPERATE the heated rear window switch 6 times (the main beam headlamps switch on and
off automatically)
8. SWITCH OFF the switch for the windscreen wash/wipe system
9. OPERATE the switch of the heated rear window
and HOLD IT THERE
10. Switch off the ignition.
11. RELEASE the heated rear window switch (three
acoustic signals will sound if activation has been
performed correctly)
After completion of the work, check all the
functions.
Inspection and Checking
NOTE: The generic electronic module (GEM) is
integrated into the central junction box (CJB).
1. VERIFY customer concern.
2. Visually CHECK for any obvious mechanical or electrical damage.
NOTE: Ensure correct locking of the wiring harness
connector.
Visual Inspection Electrical
Fuses
Wiring harness Connectors G1055084en
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