1995 ford ranger 4cyl./5spd.-door ajar chime begins as soon as key in ignition-doors closed ,seat belts latched,-chime never stops...manual states chimes for belts,airbag,doors,headlights on after ignition turned off-i tried to disconnect wires from chime unit but that disables the chime and the wipers!......no trouble codes listed when i hooked up diagnostic.
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The common problem you are describing in most cases is caused by a bad (dirty and or sticking ) door ajar switch mounted to the bottom of the inside latch . In most cases its the drivers door as it is the most used door. In some cases you can use a can of W D 40 and try spraying a liberal amount of lube on the latch and correct it momentarily. In most cases you will need to replace it.
23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs