F 150 Super Crew 4WD V8-5.4L Prop SOHC VIN Z (2003)
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ignition switch RUN position (battery potential on RUN and RUN/ACC inputs)
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ignition switch ACC position (battery potential on RUN/ACC input only)
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key-in-ignition switch (grounded with key-in-ignition, open circuit key-out)
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LH door ajar switch (open circuit with door closed, grounded with door ajar)
Headlamps Warning Chime
The headlamps warning chime warns that the headlamps are on when all the following conditions are met:
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The driver door is ajar.
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The headlamp switch position is in the PARK or HEAD position.
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The ignition switch state is in the OFF/LOCK position.
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The key is out of the ignition switch.
The headlamps warning chime will stop sounding when any one of the conditions above are removed.
The headlamps warning chime inputs are:
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ignition switch OFF/LOCK position (open circuit on all ignition inputs)
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headlamp switch (battery potential in PARK or HEAD position, open circuit when in OFF position)
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driver door ajar switch (open circuit with door closed, grounded with door ajar)
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key-in-ignition switch (grounded with key-in-ignition, open circuit with key-out)
Air Bag Redundant Chime
The restraint control module (RCM) chime warns that the air bag warning indicator is inoperative or an active fault is present within the air bag
system. The audible warning format will consist of five sets of tones, in one second increments.
