F 150 2WD Pickup V8-5.4L SOHC VIN 3 (1999)
Audible Warning Device: Description and Operation
Principles of Operation
The Generic Electronic Module (GEM) and Central Timer Module (CTM) control the following warnings and chimes:
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Driver safety belt not fastened (warning lamp and repetitive chime).
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Key-in-ignition warning (repetitive chime).
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Headlamp-on warning (repetitive chime).
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Door ajar (warning lamp and single tone).
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Air Bag Redundant (repetitive chime)
The following five distinct chime rates are used to indicate warning:
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Driver safety belt warning chime is one chime per second.
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Key-in-ignition warning is two chimes per second.
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Headlamp-on warning is four chimes per second.
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Door ajar warning is a single chime.
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Air Bag Redundant is five chimes per second.
Safety Belt Warning Chime
The safety belt warning chime warns the drivers safety belt is not fastened. The safety belt warning chime will sound when the driver safety belt is
not fastened or when the ignition switch is turned from the OFF/LOCK or ACC to the RUN or START position. The safety belt warning chime
will stop sounding when:
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The safety belt is fastened.
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The ignition switch is switched from RUN or START to the OFF/LOCK or ACC position.
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The chime has sounded for six seconds. The safety belt warning chime inputs are:
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Ignition switch START position (battery potential on the START [clutch depressed] input)
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Ignition switch RUN position (battery potential on RUN and RUN/ACC inputs).
