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
• Close the doors.

Activate service mode

Proceed as follows to activate 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
• PRESS the heated rear window switch 8 times within 6 seconds

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

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

• Direction indicators (right, left, hazard warning lights)
• "Lights on" warning (terminal 58)
• windshield wiper (intermittent wipe)
• windshield washer system
• rear window wiper
• rear window washer system
• Doors open/closed
• Central locking (if fitted)
• Bonnet up/down (in vehicles fitted with anti-theft alarm system)
• Heated rear window
• Heated windscreen (if fitted)

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

Output signals

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

• Windshield wipers (a signal sounds and the direction indicator lamps flash when the "Park" position is reached)
• Heated rear window
• Interior light(s) (the interior light switch must be in the "ON" position)
• rear window wiper
• heated windshield (if equipped, is only activated when engine is running)

If the heated rear window switch is operated again, the sequence restarts with point 'a' and the functions are activated again in this order.

End service mode

The GEM automatically ends service mode 20 seconds after the final input. 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 direction indicator lamps come on to indicate that service mode has ended.

Inspection and Checking

Visual Inspection

Defect Identification Table

Defect Identification Table

System Check

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 (CJB).
	Is the fuse OK? Yes GO to A2. No RENEW fuse F24 (20 A). CHECK the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground with the aid of the Wiring Diagrams.
A2: TEST VOLTAGE AT FUSE F24
	1 Connect Fuse F24 (CJB).
	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 operation of system.
A3: CHECK FUSE F38
	1 CHECK Fuse F38 (CJB).
	Is the fuse OK? Yes GO to A4. No RENEW fuse F38 (7.5 A). CHECK operation of system. If the fuse blows again, LOCATE and RECTIFY the short to ground with the aid of the Wiring Diagrams.
A4: CHECK THE VOLTAGE AT FUSE F38
	1 Connect Fuse F38 (CJB).
	2 Ignition switch in position II.
	3 Measure the voltage between fuse F38 (7.5 A) and ground.
	Does the meter display battery voltage? Yes GO to A5. No REPAIR the voltage supply to fuse F38 with the aid of the Wiring Diagrams. CHECK operation of system.
A5: CHECK THE VOLTAGE AT THE GENERIC ELECTRONIC MODULE (GEM)
	1 Ignition switch in position 0.
	2 Disconnect GEM C318 (blue).
	3 Measure the voltage between the GEM, connector C318, pin 2, circuit 29-AA80 (OG/WH), wiring harness side and ground.
	Does the meter display battery voltage? Yes GO to A6. No LOCATE and RECTIFY the break in circuit 29-AA80 (OG/WH) between GEM and fuse F24 with the aid of the Wiring Diagrams. CHECK operation of system.
A6: CHECK THE VOLTAGE AT THE GEM
	1 Disconnect GEM C319 (white).
	2 Ignition switch in position II.
	3 Measure the voltage between the GEM, connector C319, pin 10, circuit 15-DK20 (GN/OG), wiring harness side and ground.
	Does the meter display battery voltage? Yes GO to A7. No LOCATE and RECTIFY the break in circuit 15-DK20 (GN/OG) between the GEM and solder point S3 with the aid of the Wiring Diagrams. CHECK operation of system.
A7: TEST THE GEM GROUND CONNECTION
	1 Ignition switch in position 0.
	2 Disconnect GEM C316 (black).
	3 Measure the resistance between the GEM, connector C316, pin 2, circuit 31-DK20 (BK), wiring harness side and ground.
	Is a resistance of less than 2 Ohm registered? Yes GO to A8. No LOCATE and REPAIR the break in the circuit between the GEM and ground point G13 with the aid of the Wiring Diagrams. CHECK operation of system.
A8: TEST THE GEM GROUND CONNECTION
	1 Disconnect GEM C320 (brown).
	2 Measure the resistance between the GEM, connector C320, pin 2, circuit 91-DK20 (BK/RD), wiring harness side and ground.
	Is a resistance of less than 2 Ohm registered? Yes GO to A9. No LOCATE and RECTIFY the break in circuit 91-DK20 (BK/RD) between the GEM and ground connection G14 with the aid of the Wiring Diagrams. CHECK the operation of the system.
A9: CHECK THE CONTROL IMPULSE OF THE HEATED REAR WINDOW SWITCH
	1 Operate the heated rear window switch and keep it operated.
	2 Measure the resistance between the GEM, connector C320, pin 11, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of less than 2 Ohm registered? Yes GO to A10. No GO to A12.
A10: CHECK THE SWITCH OF THE HEATED REAR WINDOW
	1 Release the switch of the heated rear window.
	2 Measure the resistance between the GEM, connector C320, pin 11, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of more than 10 kOhms measured? Yes TEST the GEM and RENEW as necessary. CHECK the operation of the system. No GO to A11.
A11: CHECK THE CIRCUIT BETWEEN THE GEM AND THE INTEGRATED CONTROL ASSEMBLY FOR A SHORT TO GROUND
	1 Disconnect Integrated control assembly C714.
	2 Measure the resistance between the GEM, connector C320, pin 11, circuit 31S-HB22 (BK/GN), wiring harness side and ground.
	Is a resistance of more than 10 kOhms measured? Yes RENEW the integrated control assembly. CHECK the operation of the system. No LOCATE and RECTIFY the short to ground in circuit 31S-HB22 (BK/GN) with the aid of the Wiring Diagrams. CHECK operation of system.
A12: TEST THE CIRCUIT BETWEEN THE GEM AND THE INTEGRATED CONTROL ASSEMBLY FOR OPEN CIRCUIT
	1 Disconnect Integrated control assembly C714.
	2 Measure the resistance between the GEM, connector C320, pin 11, circuit 31S-HB22 (BK/GN), wiring harness side and the integrated control assembly, connector C714, pin 1, circuit 31S-HB22 (BK/GN), wiring harness side.
	Is a resistance of less than 2 Ohm registered? Yes GO to A13. No LOCATE and REPAIR the break in circuit 31S-HB22 (BK/GN) between the GEM and the integrated control assembly with the aid of the Wiring Diagrams. CHECK the operation of the system.
A13: TEST THE GROUND CONNECTION OF THE INTEGRATED CONTROL ASSEMBLY
	1 Measure the resistance between the integrated control assembly, connector C714, pin 9, circuit 31-DK1 (BK), wiring harness side and ground.
	Is a resistance of less than 2 Ohm registered? Yes RENEW the integrated control assembly. CHECK the operation of the system. No LOCATE and RECTIFY the break in circuit 31-DK1 (BK) between the integrated control assembly and soldered connection S265 with the aid of the Wiring Diagrams. CHECK the operation of the system.