A system and method for measuring a capacitance value of a capacitor are provided. In embodiments, a resistor is coupled to a terminal of the capacitor. A difference in voltage at the terminal between a first time and a second time during a discharge routine of the capacitor is measured. The discharge routine includes sinking a current through a discharge circuit coupled to the resistor from first to second. Integration of a difference in voltage at terminals of the resistor during the discharge routine between the first and second times is also measured. The capacitance value is computed based on the measured difference in voltage, the measured integration, and the resistance value of the resistor. The health of the capacitor is determined based on a difference between the computed capacitance value and a threshold value.

A system and method for measuring a capacitance value of a capacitor are provided. In embodiments, a resistor is coupled to a terminal of the capacitor. A difference in voltage at the terminal between a first time and a second time during a discharge routine of the capacitor is measured. The discharge routine includes sinking a current through a discharge circuit coupled to the resistor from first to second. Integration of a difference in voltage at terminals of the resistor during the discharge routine between the first and second times is also measured. The capacitance value is computed based on the measured difference in voltage, the measured integration, and the resistance value of the resistor. The health of the capacitor is determined based on a difference between the computed capacitance value and a threshold value.

A system and method for measuring a capacitance value of a capacitor are provided. In embodiments, a resistor is coupled to a terminal of the capacitor. A difference in voltage at the terminal between a first time and a second time during a discharge routine of the capacitor is measured. The discharge routine includes sinking a current through a discharge circuit coupled to the resistor from first to second. Integration of a difference in voltage at terminals of the resistor during the discharge routine between the first and second times is also measured. The capacitance value is computed based on the measured difference in voltage, the measured integration, and the resistance value of the resistor. The health of the capacitor is determined based on a difference between the computed capacitance value and a threshold value.

A circuit for diagnosing an open circuit in an airbag driving device may include: an open circuit sensing unit configured to sense, in a test mode for diagnosing an open circuit in a power ground (PGND) of the airbag driving device, whether an open circuit is present in the power ground (PGND) of the lower switch (L_SW) using power (VH) that is applied through an upper switch (H_SW) and the lower switch (L_SW) of the airbag driving device, and an open circuit determination unit configured to receive a voltage (V.sub.Drop) sensed by the open circuit sensing unit and determine whether the power ground (PGND) is open through a comparison between the voltage (V.sub.Drop) and a preset first reference voltage (V.sub.PG_TH).

A method and system for diagnosing a fault condition in common connected squib loops is disclosed. A current source supplies current to the feed terminal for the first squib loop and current is returned through the feed terminal for the second squib loop. The voltage is measured between the feed terminal for the first squib loop and the feed terminal for the second squib loop.

A method and system for diagnosing a fault condition in common connected squib loops is disclosed. A current source supplies current to the feed terminal for the first squib loop and current is returned through the feed terminal for the second squib loop. The voltage is measured between the feed terminal for the first squib loop and the feed terminal for the second squib loop.

A circuit for diagnosing an open circuit in an airbag driving device may include: an open circuit sensing unit configured to sense, in a test mode for diagnosing an open circuit in a power ground (PGND) of the airbag driving device, whether an open circuit is present in the power ground (PGND) of the lower switch (L_SW) using power (VH) that is applied through an upper switch (H_SW) and the lower switch (L_SW) of the airbag driving device, and an open circuit determination unit configured to receive a voltage (V.sub.Drop) sensed by the open circuit sensing unit and determine whether the power ground (PGND) is open through a comparison between the voltage (V.sub.Drop) and a preset first reference voltage (V.sub.PG.sub._.sub.TH).