•  The PCM reduces the voltage of the high voltage battery (355 V DC) to 14 V DC through the DC-DC converter to supply power to the 12 V system and charge the lead-acid battery.

•  The PCM reduces the voltage from 355 V DC to 14 V DC through the DC-DC converter, supplies power to the vehicle lights, audio and other auxiliary devices and each control module, and charges the lead acid battery.

•  The DC-DC converter steps down the 355 V DC output from the high voltage battery according to the requested voltage signal sent from the PCM via CAN communication, and outputs the stepped down current. (See DC-DC CONVERTER.)

•  The DC-DC converter performs charging of the lead-acid battery according to the request voltage signal from the PCM when the PCM determines that auxiliary device power charging is necessary when the main power is switched OFF. (See AUXILIARY DEVICE POWER CHARGING SYSTEM.)

•  The PCM monitors the operation of the DC-DC converter and if there is a malfunction, it sends an operation stop signal, turns on the lead-acid battery charging system warning light, and notifies the user that the DC-DC converter is malfunctioning.