Ford Mustang Service Manual: Lamp Assembly - Headlamp
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 |
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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 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. |
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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. |
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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. |
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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 . |
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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. |
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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. |
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C2 CHECK THE VOLTAGE TO CJB FUSE 38 (20A) | Yes Go To Pinpoint Test E . No GO to C3 . |
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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 |
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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. |
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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. |
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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. |
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F2 CHECK THE MULTIFUNCTION SWITCH | Yes GO to F4 . No GO to F3 . |
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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. |
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F4 CHECK CIRCUIT 13 (RD/BK) FOR SHORT TO POWER | Yes REPAIR the circuit. TEST the system for normal operation. No GO to F5 . |
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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. |
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Bulb - Headlamp
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 V ...Lamp Assembly - Fog Lamp (GT)
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 V ...Other materials:
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Principles of Operation
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NOTE: Battery power and ground must be removed before disconnecting the
GEM connectors to
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