F 450 2WD Super Duty V8-5.4L SOHC VIN L (2003)
General Module: Description and Operation
Principles of Operation (How Does It Work?)
Vehicle Security Module (VSM)
PRINCIPLES OF OPERATION
The vehicle security module (VSM) controls the following Systems:
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perimeter alarm
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remote keyless entry (and panic feature)
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computer-operated locks
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autolamp