| 摘要 |
A retractable step alarm in a motor vehicle or trailer which includes a processor coupled to an alarm, a door sensor, vehicle operation sensors, and extended and retracted step position sensors. The alarm is activated by an enable signal sent by the processor. T he extended step position sensor is positioned to detect if the steps are fully extended and the retracted step position sensor is positioned to detect if the steps are fully retracted. Th e processor activates the alarm means if the vehicle operation sensor indicates that the vehicle ignition is on and/or the transmission is engaged, indicative that the vehicle is bound for movement, and the retracted step position sensor indicates the steps are not fully retracted, or if the door sensor indicates the door is open and the extended step position sensor indicates the steps are not fully extended. The processor also activates the alarm means if both the extended or retracted door sensor signals are low for more than ten seconds indicating that the step is stuck partially extended or retracted and the processor activates the alarm means if both the extended or retracted do or sensor signals are high indicating the step is fully retracted and extended at the same time th us indicating one or both step position sensors or wiring has failed or is damaged.
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