Apparatus and method for diagnosing hardware in an insulation resistance monitoring system for a vehicle

An apparatus for diagnosing electronics in an insulation resistance monitoring system, the apparatus comprising:

• a controller for being electrically coupled to a plurality of electronics including a plurality of switches that are electrically coupled to a positive branch and a negative branch in a high voltage network and a low voltage network, the plurality of electronics being configured to perform insulation resistance monitoring in a vehicle, the controller being configured to:
• at least one of activate and deactivate any number of the plurality of switches to determine a mean voltage of the positive branch and the negative branch;
• and
• detect a fault in at least one of the positive branch and the negative branch that corresponds to a failure of any one of the plurality of electronics based on the mean.

An apparatus for diagnosing electronics in an insulation resistance monitoring system, the apparatus comprising:

• a controller for being electrically coupled to a plurality of electronics including a plurality of switches that are electrically coupled to a positive branch and a negative branch in a high voltage network and a low voltage network, the plurality of electronics being configured to perform insulation resistance monitoring in a vehicle, the controller being configured to:
• at least one of activate and deactivate any number of the plurality of switches to determine an overall voltage and a mean voltage of the positive branch and the negative branch;
• and
• detect a fault in at least one of the positive branch and the negative branch that corresponds to a failure of any one of the plurality of electronics based on the overall voltage.