F 550 2WD Super Duty V10-6.8L VIN V (2005)
Horn: Initial Inspection and Diagnostic Overview
INSPECTION AND VERIFICATION
1. Verify the customer concern.
Visual Inspection Chart
2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel, and
select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
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check that the program card is correctly installed.
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check the connections to the vehicle.
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check the ignition switch position.
4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
5. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
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SCP, UBP or ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications
Network).
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No response/not equipped for the vehicle security module, refer to Body Control Systems (Multifunction Electronic Control Module).
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System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test
diagnostics for the vehicle security module.
6. If the DTCs retrieved are related to the concern, go to the Vehicle Security Module Diagnostic Trouble Code (DTC) Index. See: Diagnostic
Trouble Code Descriptions
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
