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If i turn my headlights on after a few minutes a three chime happens. Only after the headlights are turned on. Same sound if you leave your lights on. Changed headlight switch and still no fix. Its a 1997 F-150 4.6 V-8 160,000mi 60,000mi on engine. Also the headlights quit one night had to pull the multi function switch back to have lights(flash high beams). Came back after a few mins.
Chimes
The generic electronic module (GEM) and central timer module (CTM) control the following warnings and chimes:
Driver safety belt not fastened (warning belt and repetitive chime).
Key-in-ignition (repetitive chime).
Headlamp-on warning (repetitive chime).
Headlamp-on reminder (repetitive chime).
Door ajar (warning lamp and single tone).
Four distinct chime rates are used to indicate warning. They are:
Safety belt warning chime is one chime per second.
Key-in-ignition warning is two chimes per second.
Headlamp-on warning is four chimes per second.
Door ajar warning is a single chime
The other defined chimed is the airbag system backup alarm. It will sound a 5 x 5 pattern when there is an airbag fault and an inoperative airbag light in the cluster.
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