ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

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Reversing Lamps > < Turn Signal and Hazard Lamps

Fusion 2002.75 (06.2002-)

Exterior Lighting - Parking, Rear and License Plate Lamps Fusion 2002.75 (06/2002-)
Diagnosis and Testing

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

Special Tool(s)

Terminal Probe Kit

29-011A

Inspection and Checking

NOTE:
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:
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, Diagnosis and Testing),
Generic Electronic Module (GEM) - Vehicles Built Up To: 10/2005 (419-10 Multifunction Electronic Modules, Diagnosis and Testing),
Generic Electronic Module (GEM) - Vehicles Built From: 10/2005 (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart

Electrical
  • Fuse(s)
  • Lamp(s)
  • Connector(s)
  • Switches
  • Wiring loom
  1. Resolve any obvious causes or concerns found during the visual inspection before carrying out any further tests.
  1. If the concern is not visually evident, refer to the Symptom Chart.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
Parking lamps, rear lamps and license lamps are inoperative
*
Fuse(s)
*
Circuit(s)
*
Headlight switch
*
Central junction box (CJB)
*
Rain sensor
*
Generic Electronic Module (GEM)
*
Gasket for license plate lamp
*
GO to Pinpoint Test A.
One or more parking lamps, rear lamps or license plate lamps are inoperative
*
Fuse(s)
*
Circuit(s)
*
Left/right-hand headlamp
*
Left/right-hand rear lamp assembly
*
Left/right-hand license plate lamp
*
Central junction box (CJB)
*
Generic Electronic Module (GEM)
*
Rain sensor
*
Gasket for license plate lamp
*
GO to Pinpoint Test B.
Parking lamps, rear lamps and license plate lamps lit continuously.
*
Circuit(s)
*
Headlight switch
*
Generic Electronic Module (GEM)
*
Central junction box (CJB)
*
GO to Pinpoint Test C.

System Checks

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.

PINPOINT TEST A : PARKING LAMPS, REAR LAMPS AND LICENSE LAMPS ARE INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: DETERMINE THE FAULT CONDITION
1
A failure of the license plate lamps is not necessarily caused by an electrical defect. Due to a high level of heat emitted from the bulb in the – license plate lamp, the gasket for the – license plate lamp may become deformed or melt. If there is a problem, a comprehensive visual inspection of the license plate lamp or the tailgate handle should first be performed, looking in particular for any traces of corrosion caused by the penetration of water.

Can traces of corrosion be seen in the area of the license plate lamps?
Yes
Install modified gaskets for the license plate lamps. Check the operation of the system.
No
GO to A2.
A2: DETERMINE VEHICLE EQUIPMENT LEVEL
1
Determine vehicle equipment level.

Does the vehicle have automatic headlights?
Yes
GO to A3.
No
GO to A5.
A3: DETERMINE THE FAULT CONDITION
NOTE:
NOTE:Cover rain sensor with a light-proof material to simulate darkness.
1
Ignition switch in position II.
2
CHECK the parking lights after each test step.
3
SWITCH ON dipped beam.
4
SWITCH OFF the dipped beam.
5
SWITCH ON automatic headlights at the headlamp switch.

Are the parking lamps only inoperative when the switch is in the automatic headlights position?
Yes
GO to A4.
No
GO to A5.
A4: CHECK THE VOLTAGE SUPPLY TO THE PARKING LAMPS (AUTOMATIC HEADLIGHTS) FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Generic electronic module (GEM) from connector C316.
3
Headlamp switch in OFF POSITION.

4
Measure the resistance between the generic electronic module (GEM), connector C316, pin 5, circuit 29S-LF25 (OG/GN), wiring harness side and ground.

Is a resistance of less than 10,000 ohms registered?
Yes
REFER to: Headlamps (417-01 Exterior Lighting, Diagnosis and Testing).
No
LOCATE and RECTIFY the break in the circuit between soldered connection S16 and the generic electronic module (GEM) using the Wiring Diagrams. CHECK the operation of the system.
A5: CHECK FUSE F17 (15 A) (CJB).
1
Ignition switch in position 0.
2
Disconnect fuse F17 (15 A) (CJB).
3
CHECK fuse F17 (15 A) (CJB).

Is the fuse OK?
Yes
GO to A6.
No
RENEW fuse F17 (15 A) (CJB) and check the operation of the system. If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
A6: CHECK THE VOLTAGE AT FUSE F17 (15 A) (CJB)
1
Connect fuse F17 (15 A) (CJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F17 (15 A) (CJB) and ground.

Does the meter display battery voltage?
Yes
GO to A7.
No
LOCATE and RECTIFY the break in the voltage supply to fuse F17 (15 A) (CJB) using the Wiring Diagrams, if necessary CHECK and RENEW the CJB. CHECK the operation of the system.
A7: CHECK VOLTAGE AT HEADLIGHT SWITCH
1
Ignition switch in position 0.
2
Disconnect headlight switch from connector C338.
3
Ignition switch in position II.

4
Measure the voltage between the headlight switch, connector C338, pin 11, circuit 29-LE29 (OG/BK), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A8.
No
LOCATE and RECTIFY the break in the circuit(s) between fuse F17 (15 A) (CJB) and the headlamp switch using the Wiring Diagrams. CHECK the operation of the system.
A8: CHECK HEADLIGHT SWITCH
1
Ignition switch in position 0.

2
Connect a fused jumper wire (15 A) at the headlamp switch, connector C338, between pin 11, circuit 29-LE29 (OG/BK) and pin 13, circuit 29S-DB8 (OG/BU), wiring harness side.
3
Ignition switch in position II.
4
CHECK the parking lamps.

Do the parking lamps illuminate?
Yes
INSTALL A NEW headlight switch. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in circuit 29S-DB8 (OG/BU), between headlight switch and CJB (bridge) using the wiring diagrams, and if necessary INSTALL A NEW CJB. CHECK the operation of the system.

PINPOINT TEST B : ONE OR MORE PARKING LAMPS, REAR LAMPS OR LICENSE PLATE LAMPS ARE INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: DETERMINE THE FAULT CONDITION
1
A failure of the license plate lamps is not necessarily caused by an electrical defect. Due to a high level of heat emitted from the bulb in the – license plate lamp, the gasket for the – license plate lamp may become deformed or melt. If there is a problem, a comprehensive visual inspection of the license plate lamp or the tailgate handle should first be performed, looking in particular for any traces of corrosion caused by the penetration of water.

Can traces of corrosion be seen in the area of the license plate lamp?
Yes
Install modified gaskets for the license plate lamps. Check the operation of the system.
No
GO to B2.
B2: DETERMINE THE FAULT CONDITION
1
SWITCH ON the side lights.
2
DETERMINE the fault conditions.

Is one left-hand parking lamp and/or the license plate lamp(s) inoperative?
Yes
- Front left-hand parking lamp (all other lamps OK): GO to B5.
- Front left-hand parking lamp and left-hand rear lamp: GO to B3.
- Left-hand rear lamp (all other lamps OK): GO to B11.
- Licence plate lamp(s) (all other lamps OK): GO to B17.
No
- Front right-hand parking lamp (all other lamps OK): GO to B8.
- Front right-hand parking lamp and rear right-hand lamp: GO to B4.
- Right-hand rear lamp (all other lamps OK): GO to B14.
B3: CHECK FUSE F22 (7.5 A) (CJB).
1
Ignition switch in position 0.
2
Disconnect fuse F22 (7.5 A) (CJB).
3
CHECK fuse F22 (7.5 A) (CJB).

Is the fuse OK?
Yes
CHECK and if necessary RENEW the CJB. CHECK the operation of the system.
No
RENEW fuse F22 (7.5 A) (CJB). If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
B4: CHECK FUSE F23 (7.5 A) (CJB).
1
Ignition switch in position 0.
2
Disconnect fuse F23 (7.5 A) (CJB).
3
CHECK fuse F23 (7.5 A) (CJB).

Is the fuse OK?
Yes
CHECK and if necessary RENEW the CJB. CHECK the operation of the system.
No
RENEW fuse F23 (7.5 A) (CJB). If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
B5: CHECK LEFT-HAND HEADLAMP
1
Ignition switch in position II.
2
SWITCH ON the left-hand turn signal.
3
CHECK left-hand turn signal lamp

Does left-hand turn signal operate?
Yes
GO to B6.
No
GO to B7.
B6: CHECK VOLTAGE AT THE FRONT LEFT-HAND PARKING LAMP
1
Ignition switch in position 0.
2
Disconnect left-hand headlamp from connector C416.
3
SWITCH ON the side lights.

4
Measure the voltage at left-hand headlamp, connector C416, between pin 4, circuit 29S-LF7 (OG/BU), wiring harness side and ground.

Does the meter display battery voltage?
Yes
CHECK and if necessary RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between fuse F22 (7.5 A) (CJB) and the left-hand headlamp using the Wiring Diagrams. CHECK the operation of the system.
B7: CHECK GROUND CONNECTION AT LEFT-HAND HEADLAMP
1
Ignition switch in position 0.
2
Disconnect left-hand headlamp from connector C416.

3
Measure the resistance between the left-hand headlamp, connector C416, pin 6, circuit 31-LE31 (BK), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and if necessary RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between the left-hand headlamp and soldered connection S10 using the wiring diagrams. CHECK the operation of the system.
B8: CHECK THE RIGHT-HAND HEADLAMP
1
Ignition switch in position II.
2
SWITCH ON the right-hand turn signal.
3
CHECK right-hand turn signal lamp.

Does right-hand turn signal work?
Yes
GO to B9.
No
GO to B10.
B9: CHECK VOLTAGE AT THE FRONT RIGHT-HAND PARKING LAMP
1
Ignition switch in position 0.
2
Disconnect right-hand headlamp from connector C422.
3
SWITCH ON the side lights.

4
Test voltage between right-hand headlamp connector C422, pin 4, circuit 29S-LF16 (OG/GN), wiring harness side and ground.

Does the meter display battery voltage?
Yes
CHECK and if necessary RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between fuse F23 (7.5 A) (CJB) and the right-hand headlamp using the Wiring Diagrams. CHECK the operation of the system.
B10: CHECK GROUND CONNECTION AT THE RIGHT-HAND HEADLAMP
1
Ignition switch in position 0.
2
Disconnect right-hand headlamp from connector C422.

3
Measure the resistance between the right-hand headlamp, connector C422, pin 6, circuit 31-LE30 (BK), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and if necessary RENEW the headlamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between the right-hand headlamp and soldered connection S11 using the wiring diagrams. CHECK the operation of the system.
B11: CHECK THE LEFT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position II.
2
SWITCH ON the left-hand turn signal.
3
Check left-hand rear turn signal lamp.

Is the left-hand rear turn signal operative?
Yes
GO to B12.
No
GO to B13.
B12: CHECK THE VOLTAGE AT THE LEFT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect Left-hand rear lamp assembly.
  • Vehicles without trailer socket: from connector C333
  • Vehicles with trailer socket: from connector C333a
3
SWITCH ON the side lights.

4
Measure the voltage at the left-hand rear lamp assembly, vehicles built before 08/2005:
  • Vehicles without trailer socket, built before 08/2005: connector C333, between pin 1, circuit 29S-LF11 (OG/WH), wiring harness side and ground.
  • Vehicles with trailer socket, built before 03/2004: connector C333a, between pin 1, circuit (GY/BK), wiring harness side and ground.
  • Vehicles with trailer socket, built from 03/2004 to 08/2005: connector C333a, between pin 1, circuit (OG/WH), wiring harness side and ground.

5
Measure the voltage at the left-hand rear lamp assembly, vehicles built from 08/2005:
  • Vehicles without trailer socket: connector C333, between pin 2, circuit 29S-LF11 (OG/WH), wiring harness side and ground.
  • Vehicles with trailer socket: connector C333a, between pin 2, circuit (OG/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
CHECK and if necessary RENEW the rear lamp assembly. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between fuse F22 (7.5 A) (CJB) and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B13: CHECK THE GROUND CONNECTION OF THE LEFT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect Left-hand rear lamp assembly.
  • Vehicles without trailer socket: from connector C333
  • Vehicles with trailer socket: from connector C333a

3
Measure the resistance between the left-hand rear lamp assembly, vehicles built before 08/2005:
  • Vehicles without trailer socket: Connector C333, pin 4, circuit 31-LF23 (BK), wiring harness side and ground.
  • Vehicles with 13-pin trailer socket, built from 03/2004: Connector C333a, pin 4, circuit (BN), wiring harness side and ground.
  • All other vehicles with trailer socket: connector C333a, pin 4, circuit (GN), wiring harness side and ground.

4
Measure the resistance between the left-hand rear lamp assembly, vehicles built from 08/2005:
  • Vehicles without trailer socket: Connector C333, pin 4, circuit 31-LF23 (BK), wiring harness side and ground.
  • Vehicles with 13-pin trailer socket: Connector C333a, pin 4, circuit (BN), wiring harness side and ground.
  • All other vehicles with trailer socket: connector C333a, pin 4, circuit (GN), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and if necessary RENEW the rear lamp assembly. CHECK the operation of the system.
No
- Vehicles without trailer socket: LOCATE and RECTIFY the break in circuit 31-LF23 (BK) between the rear lamp assembly and soldered connection S24 using the Wiring Diagrams. CHECK the operation of the system.
- Vehicles with 13-pin trailer socket, built from 03/2004: LOCATE and RECTIFY the break in the circuit (BN) between the rear lamp assembly and soldered connection S1008 using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles with trailer socket: LOCATE and RECTIFY the break in circuit(s) (GN) or 31-LF23 (BK) between the rear lamp assembly and soldered connection S24 using the Wiring Diagrams. CHECK the operation of the system.
B14: CHECK THE RIGHT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position II.
2
SWITCH ON the right-hand turn signal.
3
CHECK right-hand turn signal lamp.

Does right-hand turn signal work?
Yes
GO to B15.
No
GO to B16.
B15: CHECK THE VOLTAGE AT THE RIGHT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect Right-hand rear lamp assembly.
  • Vehicles without trailer socket: from connector C348
  • Vehicles with trailer socket: from connector C348a
3
SWITCH ON the side lights.

4
Measure the voltage at the right-hand rear lamp assembly, vehicles built before 08/2005:
  • Vehicles without trailer socket: connector C348, between pin 1, circuit 29S-LF20 (OG), wiring harness side and ground.
  • Vehicles with trailer socket, built before 03/2004: connector C348a, between pin 1, circuit (GY/RD), wiring harness side and ground.
  • Vehicles with trailer socket, built from 03/2004 to 08/2005: connector C348a, between pin 1, circuit (OG), wiring harness side and ground.

5
Measure the voltage at the right-hand rear lamp assembly, vehicles built from 08/2005:
  • Vehicles without trailer socket: connector C348, between pin 2, circuit 29S-LF20 (OG), wiring harness side and ground.
  • Vehicles with trailer socket: connector C348a, between pin 2, circuit (OG), wiring harness side and ground.

Does the meter display battery voltage?
Yes
CHECK and if necessary RENEW the rear lamp assembly. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit(s) between fuse F23 (7.5 A) (CJB) and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B16: CHECK THE GROUND CONNECTION OF THE RIGHT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect Right-hand rear lamp assembly.
  • Vehicles without trailer socket: from connector C348
  • Vehicles with trailer socket: from connector C348a

3
Measure the resistance between the right-hand rear lamp assembly, vehicles built before 08/2005:
  • Vehicles without trailer socket: Connector C348, between pin 4, circuit 31-LF24 (BK), wiring harness side and ground.
  • Vehicles with trailer socket, built before 03/2004: connector C348a, between pin 4, circuit (BK), wiring harness side and ground.
  • Vehicles with trailer socket built from 03/2004: connector C348a, between pin 4, circuit (BN), wiring harness side and ground.

4
Measure the resistance between the right-hand rear lamp assembly, vehicles built from 08/2005:
  • Vehicles without trailer socket: Connector C348, between pin 4, circuit 31-LF24 (BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C348a, between pin 4, circuit (BN), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and if necessary RENEW the rear lamp assembly. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit(s) between the rear lamp assembly and ground connection G18 using the Wiring Diagrams. CHECK the operation of the system.
B17: DETERMINE THE FAULT CONDITION
1
Ignition switch in position II.
2
SWITCH ON the side lights.

Are both license plate lamps inoperative?
Yes
GO to B18.
No
- Left-hand license plate lamp is inoperative: GO to B21.
- Right-hand license plate lamp is inoperative: GO to B22.
B18: CHECK FUSE F33 (7.5 A) (CJB).
1
Ignition switch in position 0.
2
Disconnect fuse F33 (7.5 A) (CJB).
3
CHECK Fuse F33 (7.5 A) (CJB).

Is the fuse OK?
Yes
GO to B19.
No
RENEW fuse F33 (7.5 A) (CJB). If the fuse blows again, LOCATE and RECTIFY the short to ground using the Wiring Diagrams. CHECK the operation of the system.
B19: CHECK THE VOLTAGE AT FUSE F33 (7.5 A) (CJB)
1
Connect fuse F33 (7.5 A) (CJB).
2
Ignition switch in position II.
3
SWITCH ON the side lights.
4
Measure the voltage between fuse F33 (7.5 A) and ground.

Does the meter display battery voltage?
Yes
GO to B20.
No
LOCATE and RECTIFY the break in the voltage supply to fuse F33 (7.5 A) (CJB) using the Wiring Diagrams, if necessary CHECK and RENEW the CJB. CHECK the operation of the system.
B20: TEST THE VOLTAGE SUPPLY OF THE LICENSE PLATE LAMPS
1
Ignition switch in position 0.
2
Disconnect right-hand license plate lamp from connector C760.
3
SWITCH ON the side lights.

4
Measure the voltage between the right-hand license plate lamp, connector C760, pin 1, circuit 29S-LF22 (OG/BK), wiring harness side and ground.

Does the meter display battery voltage?
Yes
LOCATE and RECTIFY the break in circuit 31-DA25 (BK) between soldered connection S201 and soldered connection S24 using the Wiring Diagrams. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit(s) between fuse F33 (7.5 A) (CJB) and the left-hand license plate lamp using the Wiring Diagrams. CHECK the operation of the system.
B21: CHECK GROUND CONNECTION OF LEFT-HAND LICENSE PLATE LAMP
1
Ignition switch in position 0.
2
Disconnect left-hand license plate lamp from connector C759.

3
Measure the resistance between the left-hand license lamp, connector C759, pin 1, circuit 31-LF21 (BK), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and if necessary RENEW the license plate lamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between the license plate lamp and soldered connection S201 using the wiring diagrams. Check the operation of the system.
B22: CHECK VOLTAGE SUPPLY TO RIGHT-HAND LICENSE PLATE LAMP
1
Ignition switch in position 0.
2
Disconnect right-hand license plate lamp from connector C760.
3
Ignition switch in position II.
4
SWITCH ON the side lights.

5
Measure the voltage between the right-hand license plate lamp, connector C760, pin 1, circuit 29S-LF22 (OG/BK), wiring harness side and ground.

Is battery voltage measured?
Yes
GO to B23.
No
LOCATE and RECTIFY the break in the circuit between the left-hand license plate lamp and the right-hand license plate lamp using the wiring diagrams. Check the operation of the system.
B23: CHECK GROUND CONNECTION OF RIGHT-HAND LICENSE PLATE LAMP
1
Ignition switch in position 0.
2
Disconnect right-hand license plate lamp from connector C761.

3
Measure the resistance between the right-hand license plate lamp, connector C761, pin 1, circuit 31-LF22 (BK), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
CHECK and INSTALL A NEW license plate lamp. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between the right-hand license plate lamp and soldered connection S201 using the wiring diagrams. Check the operation of the system.

PINPOINT TEST C : PARKING LAMPS, REAR LAMPS AND LICENSE PLATE LAMPS LIT CONTINUOUSLY.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
C1: DETERMINE THE FAULT CONDITION
1
Ignition switch in position 0.
2
Disconnect fuse F22 (7.5 A) (CJB).
3
Disconnect fuse F23 (7.5 A) (CJB).
4
Disconnect fuse F33 (7.5 A) (CJB).
5
Ignition switch in position II.
6
CHECK the parking lamps.

Are the left-hand parking lamps illuminated continuously?
Yes
- Vehicles without trailer socket: LOCATE AND RECTIFY the short to battery voltage in the circuits connected to fuse F22 (7.5 A) (CJB), output side, using the Wiring Diagrams. CHECK the operation of the system.
- Vehicles with trailer socket built before 03/2004: LOCATE AND RECTIFY the short to battery voltage in the circuits connected to fuse F22 (7.5 A) (CJB), output side, using the Wiring Diagrams. CHECK the operation of the system. If the concern persists, CHECK and if necessary INSTALL A NEW trailer control unit. CHECK the operation of the system.
- Vehicles with trailer socket built from 03/2004: LOCATE and RECTIFY short to battery voltage in the circuits connected to soldered connection S1006 using the Wiring Diagrams. CHECK the operation of the system.
No
- Right-hand parking lights are lit continuously, vehicles without trailer socket: LOCATE AND RECTIFY the short to battery voltage in the circuits connected to fuse F23 (7.5 A) (CJB), output side, using the Wiring Diagrams. CHECK the operation of the system.
- Right-hand parking lamps lit continuously, vehicles with trailer socket built before 03/2004: LOCATE AND RECTIFY the short to battery voltage in the circuits connected to fuse F23 (7.5 A) (CJB), output side, using the Wiring Diagrams. CHECK the operation of the system. If the concern persists, CHECK and if necessary INSTALL A NEW trailer control unit. CHECK the operation of the system.
- Right-hand parking lamps lit continuously, vehicles with trailer socket built from 03/2004: LOCATE and RECTIFY short to battery voltage in the circuits connected to soldered connection S1007 using the Wiring Diagrams. CHECK the operation of the system.
- License plate lamps lit continuously, vehicles built before 08/2005: GO to C2.
- License plate lamps lit continuously, vehicles built from 08/2005: LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S9 using the Wiring Diagrams. CHECK the operation of the system.
- No malfunction detected: GO to C3.
C2: CHECK THE GENERIC ELECTRONIC MODULE (GEM).
1
Ignition switch in position 0.
2
Disconnect Fuse F24 (20 A) (CJB).
3
Disconnect Fuse F25 (15 A) (CJB).
4
Disconnect Fuse F27.
  • Vehicles built before 03/2004: 10 A (CJB)
  • Vehicles built from 03/2004: 15 A (CJB)
5
Disconnect Fuse F38 (7.5 A) (CJB).
6
Ignition switch in position II.

Do the license plate lamps illuminate continuously?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S9 using the wiring diagrams. CHECK the operation of the system.
No
RENEW the GEM. CHECK the operation of the system.
C3: DETERMINE THE FAULT CONDITION
1
Ignition switch in position 0.
2
Connect fuse F22 (7.5 A) (CJB).
3
Disconnect headlight switch from connector C338.
4
Ignition switch in position II.
5
CHECK the parking lamps.

Are the left-hand parking lamps illuminated continuously?
Yes
- Vehicles with daytime running lights, built from 08/2005: GO to C4.
- Vehicles with automatic headlamps: GO to C4.
- All other vehicles: LOCATE AND RECTIFY short to battery voltage in circuits 29S-DB8 (OG/BU) or 29S-DD33 (OG), which are connected to the corresponding bridge in the CJB, using the Wiring Diagrams. CHECK the operation of the system.
No
- Vehicles without daytime running lights: INSTALL A NEW headlight switch. CHECK the operation of the system.
- Vehicles with daytime running lights: GO to C5.
C4: CHECK THE GENERIC ELECTRONIC MODULE (GEM).
1
Ignition switch in position 0.
2
Disconnect Fuse F17 (15 A) (CJB).
3
Disconnect Fuse F24 (20 A) (CJB).
4
Disconnect Fuse F25 (15 A) (CJB).
5
Disconnect Fuse F27 (15 A) (CJB).
6
Disconnect Fuse F38 (7.5 A) (CJB).
7
Ignition switch in position II.

Do the left-hand parking lamps illuminate continuously?
Yes
LOCATE and RECTIFY short to battery voltage in the circuits connected to soldered connection S16 using the Wiring Diagrams. CHECK the operation of the system.
No
RENEW the GEM. CHECK the operation of the system.
C5: CHECK HEADLIGHT SWITCH
1
Ignition switch in position 0.

2
Measure the voltage between the headlamp switch, connector C338, pin 15, circuit 15-LE32 (GN/WH), wiring harness side and ground.

Is battery voltage measured?
Yes
- Vehicles built before 08/2005: GO to C6.
- Vehicles built from 08/2005: GO to C7.
No
INSTALL A NEW headlight switch. CHECK the operation of the system.
C6: DETERMINE THE FAULT CONDITION
1
Disconnect Fuse F40 (10 A) (CJB).

2
Measure the voltage between the headlamp switch, connector C338, pin 15, circuit 15-LE32 (GN/WH), wiring harness side and ground.

Is battery voltage measured?
Yes
LOCATE AND RECTIFY the short to battery voltage in the circuits connected to fuse F40 (15 A) (CJB), output side, using the Wiring Diagrams. CHECK the operation of the system.
No
LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S1 using the Wiring Diagrams. CHECK the operation of the system. If the concern persists:
REFER to: Daytime Running Lamps (DRL) (417-04 Daytime Running Lamps (DRL), Diagnosis and Testing).
C7: DETERMINE THE FAULT CONDITION
1
Disconnect Automatic headlamps relay from socket C418.

2
Measure the voltage between the headlamp switch, connector C338, pin 15, circuit 15-LE32 (GN/WH), wiring harness side and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to the automatic headlamps relay, socket C418, pin 5 using the Wiring Diagrams. CHECK the operation of the system.
No
GO to C8.
C8: RULE OUT THE AUTOMATIC HEADLAMPS RELAY AS A SOURCE OF THE FAULT

1
Measure the voltage between the automatic headlamps relay, socket C418, pin 1, circuit 15-LE36 (GN/WH), socket side and ground.

Is battery voltage measured?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S1 using the Wiring Diagrams. CHECK the operation of the system. If the concern persists:
REFER to: Daytime Running Lamps (DRL) (417-04 Daytime Running Lamps (DRL), Diagnosis and Testing).
No
RENEW the automatic headlamps relay. CHECK the operation of the system.

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