Operation CHARM
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Ford
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2005
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Ranger 2WD L4-2.3L VIN D
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Repair and Diagnosis
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Lighting and Horns
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Horn
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Testing and Inspection
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Initial Inspection and Diagnostic Overview
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Principles of Operation
Principles of Operation
PRINCIPLES OF OPERATION
When the
horn switch
is pressed, the
horn relay
(part of the smart junction box [SJB]) is grounded, the horn relay coil is energized, and the
horn
sounds.