Diagnostic system for a vehicle electrical system having a voltage regulator

1. A diagnostic system for a vehicle electrical system having a voltage regulator outputting a first voltage, comprising: a microcontroller having a first analog-to-digital converter, a digital input-output device, first and second applications, and a first diagnostic handler application; a first voltage divider circuit electrically coupled between the voltage regulator and the first analog-to-digital converter, such that the first analog-to-digital converter receives a second voltage from the first voltage divider circuit; the first analog-to-digital converter measuring the second voltage at a first time and generating a first voltage value based on the second voltage; the first application multiplying the first voltage value by a first correction value to obtain a first corrected voltage value; the first application sends the first corrected voltage value to the second application; the first application receiving a second corrected voltage value from the second application; the first application setting a first voltage regulator status flag equal to a first fault value when a difference between the first and second corrected voltage values is greater than a threshold difference value; and the first diagnostic handler application commanding the digital input-output device to generate control signals if the first voltage regulator status flag is equal to the first fault value.

2. The diagnostic system of claim 1 , wherein the control signals from the digital input-output device transition a contactor to an open operational state.

3. The diagnostic system of claim 1 , wherein the control signals from the digital input-output device transition each of a high voltage switch and a low voltage switch in a DC-DC voltage converter to an open operational state.

4. The diagnostic system of claim 1 , wherein the microcontroller further includes a second analog-to-digital converter and a second diagnostic handler application; the diagnostic system further comprising:

a first resistor coupled between the voltage regulator and a second voltage divider circuit;

the second voltage divider circuit being further electrically coupled to the second analog-to-digital converter such that the second analog-to-digital converter receives a third voltage from the second voltage divider circuit;

the second analog-to-digital converter measuring the third voltage at a second time and generating a second voltage value based on the third voltage;

the second application multiplying the second voltage value by a second correction value to obtain the second corrected voltage value;

the second application receiving the first corrected voltage value from the first application;

the second application setting a second voltage regulator status flag equal to a second fault value when a difference between the first and second corrected voltage values is greater than the threshold difference value; and

the second diagnostic handler application generating control signals if the second voltage regulator status flag is equal to the second fault value.

5. The diagnostic system of claim 4 , wherein the control signals from the digital input-output device transition a contactor to an open operational state.

6. The diagnostic system of claim 4 , wherein the control signals from the digital input-output device transition each of a high voltage switch and a low voltage switch in a DC-DC voltage converter to an open operational state.

7. The diagnostic system of claim 4 , wherein the first and second fault values have a Hamming distance of four from one another.