Ford Workshop Service and Repair Manuals

Refer to Wiring Diagrams Section 419-10, for schematic and connector information.

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 and all other electrical loads,
• apply the handbrake,
• engage neutral or, on an automatic transmission, move the selector lever to "P",
• click the driver's side seat belt into the buckle (Japan only),
• and close the doors.

and close the doors.

Activating the service mode

Proceed as follows to activate the service mode:

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

• Switch the ignition to the "On" position.
• Switch the ignition to the "Off" position.
• PRESS and HOLD the rear window heater switch
• Switch the ignition to the "On" position.
• RELEASE the rear window heater switch

A signal sounds and the turn signal lamps come on to indicate that service mode has been successfully activated.

Input signals

SWITCH the wiper switch to the "Off" position to test the input signals. The following is a list of the signals to be tested, in no particular order:

• Turn signals (right, left, hazard warning lights)
• Side lights
• Intermittent wipe, windshield
• Wash/wipe system, windshield
• Rear wiper
• Wash/wipe system, rear window
• Doors open/closed
• Remote release switch in the centre console for the tailgate / luggage compartment lid
• Tailgate / luggage compartment lid release button in the tailgate / luggage compartment lid
• Open the tailgate / luggage compartment lid with a key.
• Locking key on the remote control (the ignition key must not be in the ignition during the test)
• Release key on the remote control (the ignition key must not be in the ignition during the test)
• Tailgate / luggage compartment lid release key on the remote control (the ignition key must not be in the ignition during the test)
• Hood open/closed (in vehicles equipped with an anti-theft alarm system)
• Heated rear window
• Heated windshield (if equipped)
• Ignition on
• Automatic transmission, selector lever position "P"
• Driver's side seatbelt (Japan only)
• Reverse gear (Japan only)

An acoustic signal sounds and the turn signal lamps flash to indicate receipt of each input signal by the generic electronic module (GEM).

Output signals

SWITCH the wiper switch to the "Intermittent wipe" position to test the output signals. PRESSING the rear window heater switch activates or deactivates the output signals in the following order:

• Front wipers (a signal sounds and the direction indicator lamps flash when the "Park" position is reached)
• Rear window heater
• Interior light(s) (the switch for the interior lights must be in the "Door contact" setting)
• "Door ajar" warning lamp in the instrument cluster
• Rear window wiper
• Windscreen heater (only activated if the engine is running)
• "Seatbelt" warning lamp in the instrument cluster (Japan only)
• Front wiper
• etc.

Ending the service mode

The GEM automatically exits the service mode 20 seconds after the last input or if the vehicle is driven. This is indicated with 3 acoustic signals and by flashing of the turn signal lamps.

Diagnosis and Testing

- Visual Inspection Chart

Symptom Chart

Symptom Chart

Pinpoint Test

PINPOINT TEST A : SERVICE MODE CANNOT BE ACTIVATED
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
A1: CHECK FUSE F24.
	1 Ignition switch in position 0.
	2 CHECK Fuse F24 (BJB).
	Is the fuse OK? Yes GO to A2. No RENEW fuse F24 (20 A). CHECK the system again. If the fuse blows again, LOCATE and RECTIFY the short to ground with the aid of the Wiring Diagrams.
A2: MEASURE THE VOLTAGE AT FUSE F24
	1 Connect Fuse F24 (BJB).
	2 Measure the voltage between fuse F24 (20 A) and ground.
	Does the meter display battery voltage? Yes GO to A3. No REPAIR the voltage supply to fuse F24 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A3: CHECK FUSE F25
	1 CHECK Fuse F25 (BJB).
	Is the fuse OK? Yes GO to A4. No RENEW fuse F25 (15 A). CHECK the system again. If the fuse blows again, LOCATE and RECTIFY the short to ground with the aid of the Wiring Diagrams.
A4: MEASURE THE VOLTAGE AT FUSE F25
	1 Connect Fuse F25 (BJB).
	2 Measure the voltage between fuse F25 (15 A) and ground.
	Does the meter display battery voltage? Yes GO to A5. No REPAIR the voltage supply to fuse F25 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A5: CHECK THE VOLTAGE AT THE GENERIC ELECTRONIC MODULE (GEM)
	1 Disconnect GEM C426.
	2 Measure the voltage between the GEM, connector C426, pin 1, circuit 29-AA17 (OG/WH), wiring harness side and ground.
	Does the meter display battery voltage? Yes GO to A6. No LOCATE and RECTIFY the break in the circuit between the GEM and fuse F24 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A6: CHECK THE VOLTAGE AT THE GEM
	1 Measure the voltage between the GEM, connector C426, pin 5, circuit 29-LG25 (OG/BU), wiring harness side and ground.
	Does the meter display battery voltage? Yes GO to A7. No LOCATE and RECTIFY the break in the circuit between the GEM and fuse F25 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A7: CHECK THE VOLTAGE AT THE GEM
	1 Connect GEM C426.
	2 Disconnect GEM C429.
	3 Ignition switch in position II.
	4 Measure the voltage between the GEM, connector C429, pin 12, circuit 8-AA30 (WH), wiring harness side and ground.
	Is a voltage of at least 10 Volts measured? Yes GO to A8. No LOCATE and RECTIFY the break in circuit 8-AA30 (WH) between the instrument cluster and the GEM with the aid of the Wiring Diagrams. CHECK the operation of the system.
A8: CHECK THE GROUND CONNECTION OF THE GEM
	1 Ignition switch in position 0.
	2 Measure the resistance between the GEM, connector C429, pin 1, circuit 91-DK20 (BK/RD), wiring harness side and ground.
	Is a resistance of less than 2 Ohm measured? Yes GO to A9. No LOCATE and RECTIFY the break in circuit 91-DK20 (BK/RD) between the GEM and ground connection G203 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A9: CHECK THE GROUND CONNECTION OF THE GEM
	1 Disconnect GEM C427.
	2 Measure the resistance between the GEM, connector C427, pin 5, circuit 31-DK20 (BK), wiring harness side and ground.
	Is a resistance of less than 2 Ohm measured? Yes GO to A10. No LOCATE and RECTIFY the break in circuit 31-DK20 (BK) between the GEM and ground connection G205 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A10: CHECK THE GROUND CONNECTION VIA THE REAR WINDOW HEATER SWITCH
	1 Press and hold the rear window heater switch.
	2 Measure the resistance between the GEM, connector C429, pin 20, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of less than 2 Ohm measured? Yes GO to A11. No GO to A13.
A11: CHECK THE GROUND CONNECTION VIA THE REAR WINDOW HEATER SWITCH
	1 Release the rear window heater switch.
	2 Measure the resistance between the GEM, connector C429, pin 20, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of more than 10 kOhms measured? Yes CHECK the GEM and RENEW as necessary. CHECK the operation of the system. No GO to A12.
A12: CHECK THE CIRCUIT BETWEEN THE GEM AND THE REAR WINDOW HEATER SWITCH FOR A SHORT TO GROUND
	1 Disconnect Rear window heater switch C488.
	2 Measure the resistance between the GEM, connector C429, pin 20, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of more than 10 kOhms measured? Yes RENEW the rear window heater switch. CHECK the operation of the system. No LOCATE and RECTIFY the short to ground in circuit 31S-HB22 (BK/GN) between the GEM and the rear window heater switch with the aid of the Wiring Diagrams. CHECK the operation of the system.
A13: CHECK THE CIRCUIT BETWEEN THE GEM AND THE REAR WINDOW HEATER SWITCH FOR OPEN CIRCUIT
	1 Disconnect Rear window heater switch C488.
	2 Measure the resistance between the GEM, connector C429, pin 20, circuit 31S-HB22 (BK/GN), wiring harness side and the rear window heater switch, connector C488, pin 2, circuit 31S-HB22 (BK/GN), wiring harness side.
	Is a resistance of less than 2 Ohm measured? Yes GO to A14. No LOCATE and RECTIFY the break in circuit 31S-HB22 (BK/GN) between the GEM and the rear window heater switch with the aid of the Wiring Diagrams. CHECK the operation of the system.
A14: CHECK THE CIRCUIT BETWEEN THE REAR WINDOW HEATER SWITCH AND GROUND FOR OPEN CIRCUIT
	1 Measure the resistance between the rear window heater switch, connector C488, pin 1, circuit 31-HB22 (BK), wiring harness side and ground.
	Is a resistance of less than 2 Ohm measured? Yes RENEW the rear window heater switch. CHECK the operation of the system. No LOCATE and RECTIFY the break in the circuit between the rear window heater switch and ground connection G204 with the aid of the Wiring Diagrams. CHECK the operation of the system.