F 150 Super Crew 2WD V8-5.4L Prop SOHC VIN Z (2003)
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 driver 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 input)
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ignition switch RUN position (battery potential on RUN and RUN/ACC inputs)
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driver safety belt switch (grounded when not fastened, open circuit when fastened)
Belt Minder
NOTE: The belt minder feature is configurable. If configuring using a diagnostic tool, refer to Module Communications Network (Information Bus).
To configure without using the special tool, refer to Belt Minder Deactivating/Activating.
The belt minder feature supplements the current safety belt warning function. The belt minder feature is enabled after the current safety belt warning is
complete. If the driver safety belt is not buckled approximately five seconds after the safety belt warning light had turned off, the belt minder reminds
the driver that their safety belt is unbuckled by intermittently sounding a chime and illuminating the safety belt warning lamp in the instrument cluster.
While activated, the belt minder alternates the chime and indicator from on for 6 seconds to off for 30 seconds.
The belt minder reminder stops when:
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the driver safety belt is buckled.
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the ignition is turned to OFF or ACC.
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five minutes have elapsed since belt minder has started.
Door Ajar Warning Chime
The door ajar warning tone warns that a door has become ajar. The door ajar warning tone is a single tone with the duration of one second. The tone
will sound when the driver or passenger door initially becomes ajar while the ignition switch is in the RUN position.
The door ajar inputs are:
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ignition switch RUN position (battery potential on RUN and RUN/ACC inputs)
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door ajar switches (open circuit with door closed, grounded with door ajar).
Key-In-Ignition Warning Chime
The key-in-ignition warning chime warns that key is still in the ignition when the driver door is ajar. The key-in-ignition warning chime will sound
when:
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GEM/CTM: driver door is ajar, the ignition switch is in the OFF/LOCK or ACC position and the key is in the ignition.
The key-in-ignition warning chime will stop sounding when:
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the driver door is closed.
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the key is removed from the ignition.
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the ignition switch is switched to the RUN position.
The key-in-ignition warning chime inputs are:
