Mustang GT V8-4.6L SOHC VIN X (1998)
Headlamp Dimmer Switch: Flow of Diagnosis
1. Verify the customer's concern by operating the switches to duplicate the condition.
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in ACC
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in RUN without the engine running
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in START before the ignition switch is released
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in RUN with the engine running
2. Inspect to determine if any of the following mechanical or electrical concerns apply:
Visual Inspection Chart:
Mechanical
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Damaged switch.
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Low fluid level (washer system).
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Damaged windshield washer hose.
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Damaged windshield wiper mechanism.
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Burned out bulbs.
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Damaged lamps.
Electrical
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Power distribution box.
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Circuit wiring.
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Switches or sending units.
3. If inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern(s) remain after the inspection, determine the symptoms and go to the Symptom Chart. See: Symptom Related Diagnostic
Procedures
