Ford Workshop Service and Repair Manuals > Focus 2004.75 (07.2004-) > Mechanical Repairs | 4 Electrical | 417 Lighting | 417-01 Exterior Lighting | Description and Operation | Diagnosis and Testing

Headlamps > < Fog Lamps

Exterior Lighting - Reversing Lamps

Focus 2004.75 (07/2004-)

Diagnosis and Testing

Refer to Wiring Diagrams Section 417-01, for schematic and connector information.

Special Tool(s)

Terminal Probe Kit

29-011A

General Equipment

Worldwide Diagnostic System (WDS)

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 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.

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:

SWITCH OFF the ignition

SWITCH OFF the switch for the windscreen wash/wipe system

OPERATE the switch of the heated rear window and HOLD IT THERE

Turn on the ignition.

RELEASE the heated rear window switch (an acoustic signal will sound if activation has been performed correctly)

SWITCH the windscreen wash/wipe switch to the "Intermittent wipe" position

OPERATE the heated rear window switch 6 times (the main beam headlamps switch on and off automatically)

SWITCH OFF the switch for the windscreen wash/wipe system

OPERATE the switch of the heated rear window and HOLD IT THERE

SWITCH OFF the ignition

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 Verification

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 configured. 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.

Verify the customer concern.

Visually inspect for obvious signs of electrical damage:

NOTE:Ensure correct engagement of the wiring harness connectors.

Visual Inspection

Electrical
Fuse(s) Lamp(s) Connector(s) Switch(es) Wiring harness

Resolve any obvious causes or concerns found during the visual inspection before carrying out any further tests.

If the concern persists after the visual inspection, PERFORM a fault diagnosis with WDS and RECTIFY any displayed faults in accordance with the displayed fault description. TEST the system for normal operation.

For vehicles with no stored fault(s), PROCEED in accordance with the Symptom Chart according to the fault symptom.

After testing and resolving the fault, the fault memory of all vehicles should be READ OUT and any stored faults CLEARED. READ OUT all fault memories again after a road test.

Trouble Code Table - Generic Electronic Module (GEM)

DTC	Description	Action
B1812	Circuit of reversing light switch faulty (short to voltage)	GO to Pinpoint Test C.

Symptom Chart

Symptom	Possible Sources	Action
Reversing lamps are inoperative	* Fuse * Circuit(s) * Rear lamp cluster(s) * Reversing lamp switch * Reversing lamp relay * Central junction box (CJB)	* GO to Pinpoint Test A.
One reversing lamp is inoperative (4-door/Cabriolet)	* Circuit(s) * Bulb * Left/right-hand rear lamp assembly * Left/right-hand tailgate lamp assembly	* GO to Pinpoint Test B.
The reversing lamps illuminate continuously	* Circuit(s) * Reversing lamp switch * Reversing lamp relay * Interior mirror with automatic glare adjustment * Central junction box (CJB)	* GO to Pinpoint Test C.

System Checks

NOTE:Use a digital multimeter for all electrical measurements.

Component Tests

Reversing lamp relay

Check the normally open contact in the unswitched state.
- Measure resistance at relay between pin 3 component side and pin 5 component side.
- Is a resistance of more than 10,000 ohms measured?

Check the normally open contact in the switched state.
- Using a fused test cable (3 A), connect pin 1 of the relay, component side, with the battery positive pole.
- Use a test cable to connect pin 2 of the relay, component side, to the battery negative terminal.
- Measure resistance at relay between pin 3 component side and pin 5 component side.
- Is a resistance of less than 2 Ohm registered?

Mechanical Repairs
4 Electrical
417 Lighting / 417-01 Exterior Lighting
Description and Operation
Diagnosis and Testing
Reversing Lamps

Headlamps > < Fog Lamps

Ford Workshop Service and Repair Manuals

Focus 2004.75 (07.2004-)

Mechanical Repairs 4 Electrical 417 Lighting / 417-01 Exterior Lighting Description and Operation Diagnosis and Testing Reversing Lamps

Mechanical Repairs 4 Electrical 417 Lighting / 417-01 Exterior Lighting Description and Operation Diagnosis and Testing Reversing Lamps

Mechanical Repairs
4 Electrical
417 Lighting / 417-01 Exterior Lighting
Description and Operation
Diagnosis and Testing
Reversing Lamps

Mechanical Repairs
4 Electrical
417 Lighting / 417-01 Exterior Lighting
Description and Operation
Diagnosis and Testing
Reversing Lamps