Ford Mustang (1999-2004) Service Manual: Fog Lamps
Refer to Wiring Diagrams Cell 86 , Fog Lamps for schematic and connector information.
Special Tool(s)
73 III Automotive Meter or equivalent 105-R0057 |
Principles of Operation
The fog lamps will only illuminate when the low beam or parking lamps are illuminated. Voltage from the parking lamp circuit is used to activate the fog lamp relay when the fog lamp switch is ON. Voltage from the high beam headlamp circuit will activate the fog lamp interrupt relay. When the fog lamp interrupt relay is active, the ground path is removed from the fog lamp relay, turning off the fog lamps.
Inspection and Verification
1. Verify the customer concern by operating the fog lamps.
2. Visually inspect for the following obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical |
Electrical |
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3. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart.
Symptom Chart
Condition | Possible Sources | Action |
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Pinpoint Tests
PINPOINT TEST O: THE FOG LAMPS ARE INOPERATIVE
Test Step | Result / Action to Take |
O1 CHECK THE PARK LAMPS | Yes Turn off the headlamp switch. GO to O2 . No GO to Pinpoint Test L . |
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O2 CHECK THE FOG LAMP RELAYS | Yes GO to O3 . No INSTALL new relay(s). TEST the system for normal operation |
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O3 CHECK THE CIRCUIT 12 (LG/BK) | Yes GO to O4 . No REPAIR the circuit. TEST the system for normal operation. |
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O4 CHECK CIRCUIT 275 (YE) | Yes GO to O5 . No REPAIR the circuit. TEST the system for normal operation |
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O5 CHECK CIRCUIT 477 (LB/BK) FOR OPEN | Yes GO to O6 . No REPAIR the circuit. TEST the system for normal operation. |
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O6 CHECK CIRCUIT 188 (WH/BK) | Yes GO to O7 . No REPAIR the circuit. TEST the system for normal operation. |
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O7 CHECK CIRCUIT 1205 (BK) | Yes GO to O8 . No REPAIR the circuit. TEST the system for normal operation. |
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O8 CHECK THE FOG LAMP SWITCH | Yes REPAIR Circuit 478 (TN/OG). TEST the system for normal operation. No INSTALL a new fog lamp switch. TEST the system for normal operation. |
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PINPOINT TEST P: THE INDIVIDUAL FOG LAMP IS INOPERATIVE
Test Step | Result / Action to Take |
P1 CHECK THE GROUND TO THE FOG LAMP | Yes REPAIR Circuit 478 (TN/OG) for open. TEST the system for normal operation. No REPAIR Circuit 1205 (BK). TEST the system for normal operation. |
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PINPOINT TEST Q: THE FOG LAMPS ARE ON CONTINUOUSLY
Test Step | Result / Action to Take |
Q1 CHECK THE FOG LAMP RELAY | Yes GO to Q2 . No REPAIR Circuit 478 (TN/OG). TEST the system for normal operation. |
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Q2 CHECK FOG LAMP RELAY | Yes RECONNECT the fog lamp relay. GO to Q3 . No INSTALL a new fog lamp relay. TEST the system for normal operation. |
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Q3 CHECK FOG LAMP SWITCH | Yes INSTALL a new fog lamp switch. TEST the system for normal operation. No REPAIR Circuit 188 (WH/BK) for short. TEST the system for normal operation. |
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Parking, Rear and License Lamps
Refer to Wiring Diagrams Cell 92 , Exterior for schematic and connector information. Special Tool(s) 73 III Automotive Meter or equivalent 105-R0057 Inspection and Verification 1 ...Reversing Lamps
Refer to Wiring Diagrams Cell 93 , Backup Lamps for schematic and connector information. Special Tool(s) 73III Automotive Meter or equivalent 105-R0057 Inspection and Verification ...Other materials:
Removal
1. Remove the upper intake manifold. For additional information, refer to
Intake Manifold-Upper
in this section.
2. Disconnect the fuel line. For additional information, refer to Section.
3. Remove the coolant by-pass tube. For additional information, refer ...
Assembly
1. CAUTION: 118 ml (4 oz) of the specified Ford Friction Modifier must
be used in the
axle.
Lubricate each steel clutch plate and soak all friction plates for no less than
15 minutes.
Use Additive Friction Modifier C8AZ-19B546-A or equivalent meeting Ford ...
Lumbar Control Switch
Removal and Installation
All vehicles
1. Remove the front seat. For additional information, refer to Seat-Front
Power in this section.
Vehicles with standard power lumbar
2. Pull to remove the lumbar control switch (14C715).
3. Disconnect the power lum ...