Ford Mustang (1999-2004) Service Manual: Headlamps
Refer to Wiring Diagrams Cell 85 , Headlamps for schematic and connector information.
Special Tool(s)
![]() |
73III Automotive Meter or equivalent 105-R0057 |
Inspection and Verification
1. Verify the customer concern by operating the headlamps.
2. Visually inspect for the following obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical | Electrical |
|
|
3. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart.
Symptom Chart
Condition | Possible Sources | Action |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Pinpoint Tests
PINPOINT TEST A: BOTH HEADLAMPS ARE INOPERATIVE
Test Step | Result / Action to Take |
A1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH | Yes GO to A2 . No REPAIR the circuit. TEST the system for normal operation. |
|
|
A2 CHECK CIRCUIT 15 (RD/YE) FOR OPEN | Yes RECONNECT headlamp switch C205. GO to A3 . No REPAIR the circuit. TEST the system for normal operation. |
|
|
A3 CHECK THE VOLTAGE TO THE MULTIFUNCTION SWITCH | Yes INSTALL a new multifunction switch; REFER to Section. TEST the system for normal operation. No INSTALL a new headlamp switch; REFER to Lamp Switch-Headlamp in this section. TEST the system for normal operation. |
|
PINPOINT TEST B: THE LOW BEAMS ARE INOPERATIVE
Test Step | Result / Action to Take |
B1 CHECK THE VOLTAGE TO CJB FUSE 4 (7.5A) AND CJB FUSE 10 (7.5A) | Yes Go To Pinpoint Test D . No GO to B2 . |
|
|
B2 CHECK CIRCUIT 13 (RD/BK) FOR OPEN | Yes INSTALL a new multifunction switch; REFER to Section. TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. |
|
PINPOINT TEST C: THE HIGH BEAMS ARE INOPERATIVE
Test Step | Result / Action to Take |
C1 CHECK THE CIRCUIT 12 (LG/BK) | Yes RECONNECT the LH headlamp (13008). GO to C2 . No REPAIR the circuit. TEST the system for normal operation. |
|
|
C2 CHECK THE VOLTAGE TO CJB FUSE 38 (20A) | Yes Go To Pinpoint Test E . No GO to C3 . |
|
|
C3 CHECK CIRCUIT 632 (GY/OG) FOR OPEN | Yes INSTALL a new multifunction switch; REFER to Section. TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation |
|
PINPOINT TEST D: ONE LOW BEAM HEADLAMP IS INOPERATIVE
Test Step | Result / Action to Take |
D1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP BULB | Yes INSTALL a new headlamp bulb; REFER to Bulb-Headlamp in this section. TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. |
|
PINPOINT TEST E: ONE HIGH BEAM HEADLAMP IS INOPERATIVE
Test Step | Result / Action to Take |
E1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP BULB | Yes INSTALL a new headlamp bulb; REFER to Bulb- Headlamp in this section. TEST the system for normal operation. No REPAIR the circuit. TEST the system for normal operation. |
|
PINPOINT TEST F: THE HEADLAMPS ARE ON CONTINUOUSLY
Test Step | Result / Action to Take |
F1 CHECK THE HEADLAMP SWITCH | Yes GO to F2 . No INSTALL a new headlamp switch; REFER to Lamp Switch-Headlamp in this section. TEST the system for normal operation. |
|
|
F2 CHECK THE MULTIFUNCTION SWITCH | Yes GO to F4 . No GO to F3 . |
|
|
F3 CHECK CIRCUIT 15 (RD/YE) FOR SHORT TO POWER | Yes REPAIR the circuit. TEST the system for normal operation. No INSTALL a new multifunction switch; REFER to Section 211- 05 . TEST the system for normal operation. |
|
|
F4 CHECK CIRCUIT 13 (RD/BK) FOR SHORT TO POWER | Yes REPAIR the circuit. TEST the system for normal operation. No GO to F5 . |
|
|
F5 CHECK CIRCUIT 1056 (DB, LG) FOR VOLTAGE | Yes REPAIR Circuit 1056 (DB/LG). TEST the system for normal operations. No REPAIR Circuit 1055 (WH/LG). TEST the system for normal operations. |
|
Exterior Lighting
Torque Specifications
Exterior Lighting
The exterior lighting system consists of the following components:
headlamps (13008)
parking lamps
rear lamps (13404)
high mounted stoplamp
...
Stoplamps
Refer to Wiring Diagrams Cell 90 , Turn/Stop/Hazard Lamps for
schematic and connector information.
Special Tool(s)
73III Automotive Meter or
equivalent
105-R0057
Inspection and Ve ...
Other materials:
Removal
1. Disconnect the battery ground cable (14301).
2. Remove the air cleaner outlet tube (9B659).
3. Remove the radiator sight shield (8C291).
4. Remove the coolant recovery reservoir (8A080).
1. Disconnect the hose.
2. Remove the bolts.
3. Remo ...
Pinpoint Tests
NOTE: Reinstall or install new evaporative emission hose clamps
removed or damaged during testing
procedures.
PINPOINT TEST A: DTC P0442 SMALL LEAK IN EVAP SYSTEM
Test Step
Result / Action to Take
NOTE: Condition P0442 DTC set: less than 0.62 ...
Special Testing Procedures
The special tests are designed to aid the technician in diagnosing the
hydraulic and mechanical portion
of the transmission.
Engine Idle Speed Check
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for
diagnosis and testing of the
eng ...