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Ford Workshop Service and Repair Manuals

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Fog Lamps > < Reversing Lamps - Vehicles Built Up To: 10-2005

Fiesta 2002.25 (11.2001-)

Exterior Lighting - Reversing Lamps—Vehicles Built From: 10/2005 Fiesta 2002.25 (11/2001-)
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 in the vehicle, so that communication between the module and WDS is ensured.
NOTE:
NOTE:If the powertrain control module (PCM) is changed, the new one must be programmed. 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: Modul-Konfiguration (418-01, Diagnosis and Testing).
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:
Kommunikations-Netzwerk - gebaut ab 08/2005 (418-00, Diagnosis and Testing),
Zentralelektrikmodul (GEM) - gebaut ab 08/2005 (419-10, Diagnosis and Testing).
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of electrical damage.

Visual Inspection

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
Reversing lamps inoperative
*
Fuse
*
Circuit(s)
*
Rear lamp assembly
*
Reversing lamp switch
*
Reversing lamp relay
*
Shift lever position sensor
*
Trailer control unit
*
Central junction box (CJB)
*
GO to Pinpoint Test A.
Reversing lamps on permanently
*
Circuit(s)
*
Reversing lamp switch
*
Reversing lamp relay
*
Powertrain control module (PCM)
*
Audio/navigation control panel
*
Generic Electronic Module (GEM)
*
Shift lever position sensor
*
Transmission control module (TCM).
*
GO to Pinpoint Test B.

System Checks

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

PINPOINT TEST A : REVERSING LAMPS INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: NARROW DOWN THE FAULT CONDITION
1
Ignition switch in position II.
2
Engage reverse gear.
3
CHECK the reversing lamps.

Is the left-hand reversing lamp inoperative?
Yes
The left-hand reversing lamp is inoperative: GO to A12.
No
- The right-hand reversing lamp is inoperative: GO to A14.
- Both reversing lamps are inoperative: GO to A2.
A2: CHECK FUSE F48 (7.5 A) (CJB).
1
Ignition switch in position 0.
2
Disconnect fuse F48 (7.5 A) (CJB).
3
CHECK fuse F48 (7.5 A) (CJB).

Is the fuse OK.?
Yes
GO to A3.
No
RENEW fuse F48 (7.5 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.
A3: CHECK THE VOLTAGE SUPPLY TO FUSE F48 (7.5 A) (CJB) FOR OPEN CIRCUIT
1
Connect fuse F48 (7.5 A) (CJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F48 (7.5 A) (CJB) and ground.

Does the meter display battery voltage?
Yes
- Vehicles with manual transmission and with Durashift EST: GO to A4.
- Vehicles with 4-speed automatic transmission (AW81-40): GO to A6.
No
LOCATE AND RECTIFY the break in the voltage supply to fuse F48 (7.5 A) (CJB) using the Wiring Diagrams. If necessary RENEW the CJB. CHECK the operation of the system.
A4: CHECK VOLTAGE SUPPLY TO THE REVERSING LAMP SWITCH FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect reversing lamp switch from connector C425.
3
Ignition switch in position II.

4
Measure the voltage between the reversing lamp switch, connector C425, pin 1, circuit 15-LG28 (GN/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A5.
No
LOCATE and RECTIFY the break in the circuit between fuse F48 (7.5 A) (CJB) and the reversing lamp switch using the Wiring Diagrams. CHECK the operation of the system.
A5: CHECK REVERSING LAMP SWITCH
1
Ignition switch in position 0.

2
Connect a fused jumper wire (7.5 A) to the reversing lamp switch, connector C425, between pin 1, circuit 15-LG28 (GN/WH) and
  • On petrol engines: pin 2, circuit 15S-LG1 (GN/YE), wiring harness side.
  • On diesel engines: pin 2, circuit 15S-LG5 (GN/RD), wiring harness side.
3
Ignition switch in position II.
4
CHECK the operation of the reversing lamps.

Do the reversing lamps illuminate?
Yes
INSTALL A NEW reversing lamp switch. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuits between the reversing lamp switch and soldered connection S32 using the Wiring Diagrams. CHECK the operation of the system.
A6: CHECK VOLTAGE SUPPLY TO THE REVERSING LAMP RELAY FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect reversing lamp relay from socket C434.
3
Ignition switch in position II.

4
Measure the voltage between the reversing lamp relay, socket C434, pin 3, circuit 15-LG28 (GN/WH)/15-TC6 (GN/YE), socket side and ground.

Does the meter display battery voltage?
Yes
GO to A7.
No
LOCATE and RECTIFY the break in the circuit between fuse F48 (7.5 A) (CJB) and the reversing lamp relay using the Wiring Diagrams. CHECK the operation of the system.
A7: NARROW DOWN THE CAUSE OF THE FAULT
1
Ignition switch in position 0.

2
Connect a fused jumper wire (7.5 A) at reversing lamp relay, socket C434, between pin 3, circuit 15-LG28 (GN/WH)/15-TC6 (GN/YE), socket side and pin 5, circuit 15S-LG1 (GN/YE), socket side.
3
Ignition switch in position II.
4
CHECK the reversing lamps.

Do the reversing lamps illuminate?
Yes
GO to A8.
No
LOCATE and RECTIFY the break in the circuits between the reversing lamp relay and soldered connection S32 using the Wiring Diagrams. CHECK the operation of the system.
A8: CHECK CIRCUIT 15S-TC6 (GN/YE) FOR OPEN CIRCUIT

1
Measure the voltage between the reversing lamp relay, socket C434, pin 1, circuit 15-TC6 (GN/YE), socket side and ground.

Does the meter display battery voltage?
Yes
GO to A9.
No
LOCATE and RECTIFY the break in the circuit at the reversing lamp relay, socket C434, between pin 1 and pin 3 using the Wiring Diagrams. If necessary RENEW the engine compartment relay box. CHECK the operation of the system.
A9: CHECK THE REVERSING LAMP RELAY
1
ENGAGE reverse gear

2
Measure the voltage between the reversing lamp relay, socket C434, pin 1, circuit 15-TC6 (GN/YE), socket side and pin 2, circuit 91S-TC6 (BK/YE), socket side.

Does the meter display battery voltage?
Yes
RENEW the reversing lamp relay. CHECK the operation of the system.
No
GO to A10.
A10: CHECK THE CONTROL CIRCUIT BETWEEN THE SHIFT LEVER POSITION SENSOR AND THE REVERSING LAMP RELAY FOR OPEN CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Shift lever position sensor from connector C431.

3
Measure the resistance between the reversing lamp relay, socket C434, pin 2, circuit 91S-TC6 (BK/YE), socket side and the shift lever position sensor, connector C431, pin 2, circuit 91S-TA1 (BK/BU), wiring harness side.

Is a resistance of less than 2 ohms registered?
Yes
GO to A11.
No
LOCATE and RECTIFY the break in the circuit between the reversing lamp relay and the shift lever position sensor using the Wiring Diagrams. CHECK the operation of the system.
A11: RULE OUT THE SHIFT LEVER POSITION SENSOR AS THE CAUSE OF THE FAULT

1
Measure the resistance between the shift lever position, connector C431, pin 3, circuit 91-TA18 (BK/RD), wiring harness side and ground.

Is a resistance of less than 2 ohms registered?
Yes
RENEW the shift lever position sensor. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in the circuit between the shift lever position sensor and soldered connection S132 using the Wiring Diagrams. CHECK the operation of the system.
A12: CHECK THE VOLTAGE SUPPLY TO THE LEFT-HAND REAR LAMP ASSEMBLY FOR OPEN CIRCUIT
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
Ignition switch in position II.
4
Engage reverse gear.

5
Measure the voltage between the left-hand rear lamp assembly
  • Vehicles without trailer socket: connector C333, pin 5, circuit 15S-LG39B (GN/OG), wiring harness side and ground.
  • Vehicles with trailer socket: Connector C333a, pin 5, circuit (VT/YE), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A13.
No
LOCATE and RECTIFY the break in the circuits between soldered connection S32 and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
A13: CHECK THE GROUND CONNECTION TO THE LEFT-HAND REAR LAMP ASSEMBLY FOR OPEN CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between left-hand rear lamp assembly
  • Vehicles without trailer socket: connector C333, pin 4, circuit 31-LF23 (BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C333a, 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 circuits between the rear lamp assembly and soldered connection S24 using the Wiring Diagrams. CHECK the operation of the system.
A14: CHECK VOLTAGE SUPPLY TO THE RIGHT-HAND REAR LAMP ASSEMBLY FOR OPEN CIRCUIT
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
Ignition switch in position II.
4
Engage reverse gear.

5
Measure the voltage between the right-hand rear lamp assembly
  • Vehicles without trailer socket: connector C348, pin 5, circuit 15S-LG39A (GN/OG), wiring harness side and ground.
  • Vehicles with trailer socket: connector C348a, pin 5, circuit (WH/BK), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to A15.
No
LOCATE and RECTIFY the break in the circuits between soldered connection S32 and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
A15: CHECK THE GROUND CONNECTION TO THE RIGHT-HAND REAR LAMP ASSEMBLY FOR OPEN CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between the right-hand rear lamp assembly
  • Vehicles without trailer socket: connector C348, pin 4, circuit 31-LF24 (BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C348a, pin 4, circuit (WH/BK), 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 circuits between the rear lamp assembly and ground connection G18 using the Wiring Diagrams. CHECK the operation of the system.

PINPOINT TEST B : REVERSING LAMPS ON PERMANENTLY
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: CHECK REVERSING LAMP SWITCH
1
Ignition switch in position 0.
2
Disconnect Corresponding component.
  • Vehicles with manual transmission and with Durashift EST: reversing lamp switch from connector C425
  • Vehicles with 4-speed automatic transmission (AW81-40): reversing lamp relay from socket C434
3
Ignition switch in position II.
4
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
GO to B2.
No
- Vehicles with manual transmission and with Durashift EST: INSTALL A NEW reversing lamp switch. CHECK the operation of the system.
- Vehicles with 4-speed automatic transmission (AW81-40): GO to B5.
B2: RULE OUT THE GENERIC ELECTRONIC MODULE (GEM) AS POSSIBLE CAUSE FOR A SHORT TO BATTERY VOLTAGE
1
Ignition switch in position 0.
2
Disconnect fuse F8 (7.5 A) (CJB).
3
Disconnect fuse F17 (15 A) (CJB).
4
Disconnect fuse F24 (20 A) (CJB).
5
Disconnect fuse F25 (15 A) (CJB).
6
Disconnect fuse F26 (20 A) (CJB).
7
Disconnect fuse F27 (15 A) (CJB).
8
Disconnect fuse F38 (7.5 A) (CJB).
9
Disconnect fuse F46 (20 A) (CJB).
10
Disconnect fuse F47 (10 A) (CJB).
11
Ignition switch in position II.
12
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
GO to B3.
No
RENEW the generic electronic module (GEM). CHECK the operation of the system.
B3: ELIMINATE THE AUDIO/NAVIGATION CONTROL PANEL AS THE CAUSE OF A SHORT TO BATTERY VOLTAGE
1
Ignition switch in position 0.
2
Connect fuse F8 (7.5 A) (CJB).
3
Connect fuse F17 (15 A) (CJB).
4
Connect fuse F24 (20 A) (CJB).
5
Connect fuse F25 (15 A) (CJB).
6
Connect fuse F26 (20 A) (CJB).
7
Connect fuse F27 (15 A) (CJB).
8
Connect fuse F38 (7.5 A) (CJB).
9
Connect fuse F46 (20 A) (CJB).
10
Connect fuse F47 (10 A) (CJB).
11
Disconnect fuse F18 (15 A) (CJB).
12
Disconnect fuse F44 (3 A) (CJB).
13
Ignition switch in position II.
14
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
- Vehicles with diesel engines: GO to B4.
- Vehicles with petrol engines: LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S32 using the Wiring Diagrams. CHECK the operation of the system.
No
RENEW the audio/navigation control panel CHECK the operation of the system.
B4: RULE OUT THE POWERTRAIN CONTROL MODULE (PCM) AS POSSIBLE CAUSE FOR A SHORT TO BATTERY VOLTAGE
1
Ignition switch in position 0.
2
Connect fuse F18 (15 A) (CJB).
3
Connect fuse F44 (3 A) (CJB).
4
Disconnect Powertrain control module (PCM) from connector C372, C377 or C384.
5
Ignition switch in position II.
6
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to soldered connection S32 using the Wiring Diagrams. CHECK the operation of the system.
No
INSTALL the powertrain control module (PCM). CHECK the operation of the system.
B5: ELIMINATE THE SHIFT LEVER POSITION SENSOR AS CAUSE FOR THE SHORT TO GROUND
1
Ignition switch in position 0.
2
Connect reversing lamp relay to socket C434.
3
Disconnect Shift lever position sensor from connector C431.
4
Ignition switch in position II.
5
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
GO to B6.
No
RENEW the shift lever position sensor. CHECK the operation of the system.
B6: RULE OUT THE TRANSMISSION CONTROL MODULE (TCM) AS POSSIBLE CAUSE FOR A SHORT TO GROUND
1
Ignition switch in position 0.
2
Disconnect Transmission control module (TCM) from connector C429.
3
Ignition switch in position II.
4
CHECK the reversing lamps.

Do the reversing lamps illuminate continuously?
Yes
GO to B7.
No
RENEW the transmission control module (TCM). CHECK the operation of the system.
B7: RULE OUT THE CONTROL CIRCUIT OF THE REVERSING LAMP RELAY AS THE SOURCE OF THE FAULT
1
Ignition switch in position 0.
2
Disconnect reversing lamp relay from socket C434.

3
Measure the resistance between the reversing lamp relay, socket C434, pin 2, circuit 91S-TC6 (BK/YE), socket side and ground.

Is a resistance of more than 10,000 ohms measured?
Yes
RENEW the reversing lamp relay. CHECK the operation of the system.
No
LOCATE and RECTIFY the short to ground in the circuits connected to soldered connection S134 using the Wiring Diagrams. CHECK the operation of the system.

Fog Lamps > < Reversing Lamps - Vehicles Built Up To: 10-2005