Ford Workshop Service and Repair Manuals

Description of operation

A diagnosis of the generic electronic module (GEM) can be performed with WDS. 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

Proceed as follows to activate the service mode:

• OPERATE the switch of the heated rear window and HOLD IT THERE
• Turn 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.

NOTE:If the alarm is activated (in vehicles fitted with an anti-theft alarm system), service mode cannot be 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:

• 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
• 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 reservoir fluid level
• Speed control system
• Autolamps
• dipped beam
• main beam
• headlamp flasher
• Marker Lamps
• Reversing lamp
• 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:

• Turn Indicator Left Hand
• Turn Indicator Right Hand
• main beam
• dipped beam
• Windshield wiper stage I
• Windshield wiper stage II
• Heated rear window
• Heater blower motor
• Headlamp washer system (vehicles with gas discharge headlamps)
• Electric booster heater (if fitted)
• Autolamps (if fitted)
• Alarm horn (vehicles with alarm system)
• Rear window wiper
• Rear heated 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 7 km/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.

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 lamps and license plate lamp in autolamps mode
• Rear wiper
• Headlamp Washers
• Electric booster heater
• Active anti-theft sounder
• 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:

After completion of the work, check all the functions.

Inspection and Checking

NOTE:The generic electronic module (GEM) forms part of the central junction box (CJB).

NOTE:If the generic electronic module (GEM) is changed, the new one must be reconfigured. For this purpose, the vehicle-specific data is read out of the module to be replaced using WDS and is transferred to the new module. REFER to:

Module Configuration (418-01 Module Configuration, General Procedures),

Generic Electronic Module (GEM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).

NOTE:Before reading out the vehicle-specific data, remake all the electrical connections which were separated in the vehicle, so that communication between the module and WDS is ensured.

NOTE:Ensure correct engagement of the wiring harness connectors.

Visual Inspection

Trouble Code Table - Generic Electronic Module (GEM)

Trouble Code Table - Generic Electronic Module (GEM)

Symptom Chart

Symptom Chart

System Checks

NOTE:Use a digital multimeter for all electrical measurements.

Reversing lamp relay