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System for detecting the integrity of a lighting circuit

  • US 9,434,308 B2
  • Filed: 11/14/2014
  • Issued: 09/06/2016
  • Est. Priority Date: 11/15/2013
  • Status: Active Grant
First Claim
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1. A status monitoring circuit for monitoring the status of an external device coupled to an electrical system of a vehicle, the status monitoring circuit comprising:

  • a sensing unit coupled to the external device and configured to sense an input voltage and an input current at the external device;

    a monitoring unit coupled to the sensing unit and configured to determine whether the external device is operational based on the sensed input voltage, and, in response, to detect an undercurrent condition of the external device based on the sensed input current, the monitoring unit being further configured to disregard the sensed input current when the external device is not operational; and

    a status indicator coupled to the monitoring unit and configured to display a fault indication in response to the monitoring unit detecting the undercurrent condition.

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