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Turn Signal and Hazard Lamps > < Headlamps

Fiesta 1996 (08.1995-02.2002)

Exterior Lighting - Stoplamps Fiesta 1996 (08/1995-02/2002)
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

  1. Verify the customer concern.
  1. Visually inspect for the following mechanical and electrical causes of the concern:

Visual Inspection

Mechanical Electrical
  • Stop lamp switch adjustment
  • Fuse(s)
  • Lamp(s)
  • Connector(s)
  • Switches
  • Wiring harness
  1. Resolve any obvious causes or concerns found during the visual inspection before carrying out any further tests.
  1. If the concern persists, check the symptoms and continue with the symptom chart.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
Stop lamps are inoperative
*
Fuse
*
Circuit(s)
*
Stop lamp switch
*
Central junction box (CJB)
*
GO to Pinpoint Test A.
One individual stop lamp is inoperative
*
Circuit(s)
*
Rear lamp assembly
*
Additional high-mounted stop lamp
*
GO to Pinpoint Test B.
Stop lamps illuminate continuously
*
Circuit(s)
*
Stop lamp switch
*
ABS module
*
Powertrain control module (PCM) (Diesel)
*
GO to Pinpoint Test C.

System Checks

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

PINPOINT TEST A : STOP LAMPS ARE INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK FUSE F13
1
Ignition switch in position 0.
2
CHECK fuse F13 (CJB) (15 A).

Is the fuse OK?
Yes
GO to A2.
No
RENEW fuse F13 (15 A) 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.
A2: CHECK THE VOLTAGE AT FUSE F13
1
Connect fuse F13 (CJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F13 (15 A) and ground.

Does the meter display battery voltage?
Yes
GO to A3.
No
CHECK and if necessary RENEW the central junction box (CJB). CHECK the operation of the system.
A3: CHECK VOLTAGE AT STOP LAMP SWITCH
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Ignition switch in position II.

4
Measure the voltage between the stop lamp switch, connector C62, pin 2, circuit 14-LG23 (VT/WH), wiring harness side and ground.

Does the meter display battery voltage?
Yes
- LHD with additional high-mounted stop lamp and without ABS, except Courier und refrigerated van: CHECK adjustment of the stop lamp switch and RENEW the switch if necessary. CHECK the operation of the system.
- Courier, refrigerated van and all other vehicles without additional high-mounted stop lamp: GO to A4.
- All vehicles with additional high-mounted stop lamp, except LHD without ABS, except Courier and refrigerated van: GO to A5.
No
LOCATE and RECTIFY the break in the circuit between fuse F13 and the stop lamp switch using the Wiring Diagrams. CHECK the operation of the system.
A4: CHECK STOP LAMP SWITCH
1
Ignition switch in position 0.

2
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
3
Ignition switch in position II.
4
Check the operation of the stop lamps.

Do the stop lamps illuminate?
Yes
CHECK adjustment of the stop lamp switch and RENEW the switch if necessary. CHECK the operation of the system.
No
- Courier and refrigerated van: LOCATE and RECTIFY the break in circuit 14S-LG38 (VT) or 14S-LG41 (VT/BK), between the stop lamp switch and soldered connection S35 (LHD) or S36 (RHD) using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles: LOCATE and RECTIFY the break in circuit 14S-LG38 (VT) or 14S-LG41 (VT/BK), between the stop lamp switch and the rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
A5: CHECK STOP LAMP SWITCH
1
Ignition switch in position 0.

2
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
3
Ignition switch in position II.
4
Check the operation of the stop lamps.

Do the stop lamps illuminate?
Yes
CHECK adjustment of the stop lamp switch and RENEW switch if necessary. CHECK the operation of the system.
No
LOCATE and RECTIFY the break in circuit 14S-LG1 (VT/YE), between the stop lamp switch and soldered connection S1180 using the Wiring Diagrams. CHECK the operation of the system.

PINPOINT TEST B : ONE INDIVIDUAL STOP LAMP IS INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: DETERMINE THE FAULT CONDITION
1
Determine the fault condition.

Is the left-hand stop lamp inoperative?
Yes
GO to B2.
No
- Right-hand stop lamp is inoperative: GO to B7.
- LHD, both stop lamps are inoperative, additional high-mounted stop lamp OK: LOCATE and RECTIFY the break in circuit 14S-LG38 (VT), between the left-hand rear lamp assembly and the stop lamp switch using the Wiring Diagrams. CHECK the operation of the system.
- RHD, both stop lamps are inoperative, additional high-mounted stop lamp OK: LOCATE and RECTIFY the break in circuit 14S-LG41 (VT/BK), between the right-hand rear lamp assembly and the stop lamp switch using the Wiring Diagrams. CHECK the operation of the system.
- additional high-mounted stop lamp is inoperative: GO to B12.
B2: DETERMINE THE FAULT CONDITION
1
Switch on the side lights.
2
Check the left-hand rear side lamp.

Does the left-hand rear side lamp illuminate?
Yes
- LHD, except Courier and refrigerated van without trailer socket: GO to B6.
- Courier and refrigerated van: GO to B3.
- All other vehicles: GO to B4.
No
- Courier and refrigerated van: GO to B5.
- All other vehicles: GO to B6.
B3: CHECK THE VOLTAGE SUPPLY TO THE LEFT-HAND STOP LAMP
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Disconnect left-hand rear lamp assembly from connector C1050(a).

4
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
5
Ignition switch in position II.

6
Measure the voltage between the left-hand rear lamp assembly:
  • Courier without trailer socket: connector C1050, pin 3, circuit 14S-LG38A (VT) (LHD) or 14S-LG41A (VT/BK) (RHD), wiring harness side and ground.
  • Courier with trailer socket: connector C1050a, pin 3, circuit (BK/RD), 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 soldered connection S35 (LHD) or S36 (RHD)and the left-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B4: CHECK THE VOLTAGE SUPPLY TO THE LEFT-HAND STOP LAMP
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Disconnect left-hand rear lamp assembly from connector C50(a).

4
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
5
Ignition switch in position II.

6
Measure the voltage between the left-hand rear lamp assembly:
  • Vehicles without trailer socket: connector C50, pin 2, circuit 14S-LG38 (VT), wiring harness side and ground.
  • Vehicles with trailer socket: connector C50a, pin 2, circuit (BK/RD), 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
- Vehicles without trailer socket: LOCATE and RECTIFY the break in the circuit between the right-hand rear lamp assembly and the left-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
- Vehicles with trailer socket: LOCATE and RECTIFY the break in the circuit between intermediate connector C49 (RHD) or C50 (LHD) and the left-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B5: CHECK GROUND CONNECTION OF LEFT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect left-hand rear lamp assembly from connector C1050(a).

3
Measure the resistance between the left-hand rear lamp assembly:
  • Courier without trailer socket: connector C1050, pin 2, circuit 31-LF23 (BK), wiring harness side and ground.
  • Courier with trailer socket: connector C1050a, pin 2, circuit (GN), wiring harness side and ground.

Is less than 2 Ohm measured?
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 the left-hand rear lamp assembly and ground G5 using the Wiring Diagrams. CHECK the operation of the system.
B6: CHECK GROUND CONNECTION OF LEFT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect left-hand rear lamp assembly from connector C50(a).

3
Measure the resistance between the left-hand rear lamp assembly:
  • Vehicles without trailer socket: connector C50, pin 4, circuit 31-LF23 (BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C50a, pin 4, circuit (GN), wiring harness side and ground.

Is less than 2 Ohm measured?
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 the left-hand rear lamp assembly and ground G5 using the Wiring Diagrams. CHECK the operation of the system.
B7: DETERMINE THE FAULT CONDITION
1
Switch on the side lights.
2
Check the rear right-hand side light.

Does the rear right-hand side light illuminate?
Yes
- RHD, except Courier and refrigerated van without trailer socket: GO to B11.
- Courier and refrigerated van: GO to B8.
- All other vehicles: GO to B9.
No
- Courier and refrigerated van: GO to B10.
- All other vehicles: GO to B11.
B8: CHECK THE VOLTAGE SUPPLY TO THE RIGHT-HAND STOP LAMP
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Disconnect right-hand rear lamp assembly from connector C1049(a).

4
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
5
Ignition switch in position II.

6
Measure the voltage between the right-hand rear lamp assembly:
  • Courier without trailer socket: connector C1049, pin 3, circuit 14S-LG41 (VT/BK) (LHD) or 14S-LG38 (VT/BK) (RHD), wiring harness side and ground.
  • Courier with trailer socket: connector C1049a, pin 3, circuit (GN), 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 soldered connection S35 (LHD) or S36 (RHD)and the right-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B9: CHECK THE VOLTAGE SUPPLY TO THE RIGHT-HAND STOP LAMP
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Disconnect right-hand rear lamp assembly from connector C49(a).

4
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
5
Ignition switch in position II.

6
Measure the voltage between the right-hand rear lamp assembly:
  • Vehicles without trailer socket: connector C49, pin 4, circuit 14S-LG41 (VT/BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C49a, pin 4, circuit (GN), 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
- Vehicles without trailer socket: LOCATE and RECTIFY the break in the circuit between the left-hand rear lamp assembly and the right-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
- Vehicles with trailer socket: LOCATE and RECTIFY the break in the circuit between intermediate connector C49 (RHD) or C50 (LHD) and the right-hand rear lamp assembly using the Wiring Diagrams. CHECK the operation of the system.
B10: CHECK GROUND CONNECTION OF THE RIGHT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect right-hand rear lamp assembly from connector C1049(a).

3
Measure the resistance between the right-hand rear lamp assembly:
  • Courier without trailer socket: connector C1049, pin 2, circuit 31-LF24 (BK), wiring harness side and ground.
  • Courier with trailer socket: connector C1049a, pin 2, circuit (GN), wiring harness side and ground.

Is less than 2 Ohm measured?
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 the right-hand rear lamp assembly and ground G3 using the Wiring Diagrams. CHECK the operation of the system.
B11: CHECK GROUND CONNECTION OF THE RIGHT-HAND REAR LAMP ASSEMBLY
1
Ignition switch in position 0.
2
Disconnect right-hand rear lamp assembly from connector C49(a).

3
Measure the resistance between the right-hand rear lamp assembly:
  • Vehicles without trailer socket: connector C49, pin 2, circuit 31-LF24 (BK), wiring harness side and ground.
  • Vehicles with trailer socket: connector C49a, pin 2, (GN), wiring harness side and ground.

Is less than 2 Ohm measured?
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 the right-hand rear lamp assembly and ground G3 using the Wiring Diagrams. CHECK the operation of the system.
B12: CHECK VOLTAGE AT THE ADDITIONAL HIGH-MOUNTED STOP LAMP
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Disconnect additional high-mounted stop lamp from connector C390.

4
Use a fused test cable (15 A) to bridge the stop lamp switch, connector C62, pin 1 and pin 2, wiring harness side.
5
Ignition switch in position II.

6
Measure the voltage between the additional high-mounted stop lamp, connector C390, pin 1, circuit 14S-LG6 (VT/YE), wiring harness side and ground.

Does the meter display battery voltage?
Yes
GO to B13.
No
- Vehicles without ABS, except Courier and refrigerated van: LOCATE and RECTIFY the break in the circuit between the stop lamp switch and the additional high-mounted stop lamp using the Wiring Diagrams. CHECK the operation of the system.
- Courier and refrigerated van: LOCATE and RECTIFY the break in the circuit between soldered connection S35 (LHD) or S36 (RHD)and the additional high-mounted stop lamp using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles: LOCATE and RECTIFY the break in the circuit between soldered connection S1180 and the additional high-mounted stop lamp using the Wiring Diagrams. CHECK the operation of the system.
B13: CHECK GROUND CONNECTION OF ADDITIONAL HIGH-MOUNTED STOP LAMP
1
Ignition switch in position 0.

2
Measure the resistance between the additional high-mounted stop lamp, connector C390, pin 2, circuit 31-LG6 (BK), wiring harness side and ground.

Is less than 2 Ohm measured?
Yes
CHECK and if necessary RENEW the additional high-mounted stop lamp. CHECK the operation of the system.
No
- Courier and refrigerated van: LOCATE and RECTIFY the break in the circuit between the additional high-mounted stop lamp and soldered connection S151 using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles with anti-theft warning system: LOCATE and RECTIFY the break in the circuit between the additional high-mounted stop lamp and soldered connection S121 (up to 09/2000) or S1140 (from 09/2002) using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles without anti-theft warning system: LOCATE and RECTIFY the break in the circuit between the additional high-mounted stop lamp and ground G12 (up to 09/2000) or G21 (from 09/2002) using the Wiring Diagrams. CHECK the operation of the system.

PINPOINT TEST C : STOP LAMPS ILLUMINATE CONTINUOUSLY
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
C1: CHECK STOP LAMP SWITCH
1
Ignition switch in position 0.
2
Disconnect stop lamp switch from connector C62.
3
Ignition switch in position II.
4
Check the stop lamps.

Do the stop lamps illuminate continuously?
Yes
- 1.8 l diesel Endura-DI without ABS: GO to C3.
- LHD without ABS, except Courier and refrigerated van: LOCATE and RECTIFY the short to battery voltage in the circuits connected to the stop lamp switch , connector C62, pin 1 using the Wiring Diagrams. CHECK the operation of the system.
- All other vehicles: GO to C2.
No
CHECK adjustment of the stop lamp switch and RENEW switch if necessary. CHECK the operation of the system.
C2: CHECK ABS MODULE
1
Ignition switch in position 0.
2
Disconnect fuse F24 (BJB).
3
Disconnect fuse F26 (BJB).
4
Disconnect fuse F28 (BJB).
5
Ignition switch in position II.
6
Check the stop lamps.

Do the stop lamps illuminate continuously?
Yes
- 1.8 l diesel Endura-DI: GO to C3.
- All other vehicles: LOCATE and RECTIFY the short to battery voltage in the circuits connected to the stop lamp switch , connector C62, pin 1 using the Wiring Diagrams. CHECK the operation of the system.
No
RENEW the ABS module. CHECK the operation of the system.
C3: CHECK THE POWERTRAIN CONTROL MODULE
1
Ignition switch in position 0.
2
Disconnect fuse F30 (BJB).
3
Disconnect fuse F33 (BJB).
4
Disconnect fuse F37 (BJB).
5
Disconnect fuse F18 (CJB).
6
Ignition switch in position II.
7
Check the stop lamps.

Do the stop lamps illuminate continuously?
Yes
LOCATE and RECTIFY the short to battery voltage in the circuits connected to the stop lamp switch , connector C62, pin 1 using the Wiring Diagrams. CHECK the operation of the system.
No
RENEW the powertrain control module (PCM). CHECK the operation of the system.

Turn Signal and Hazard Lamps > < Headlamps