12 VOLT BATTERY CHARGING LOGIC SERVICE INFORMATION
SERVICE INFORMATION
12 volt Lead Acid Battery (12 volt LAB) charging logic and best practices to ensure
12 volt condition is maintained.
The ARIYA has many advanced electronic systems that are heavily dependent on the 12
volt LAB. Under certain conditions, the 12 volt LAB may or may not receive charging by the
High Voltage battery (HV battery), through the DC/DC converter. Not understanding these
conditions can lead to a discharged 12 volt LAB.
The ARIYA has several key functions to ensure that the 12 volt LAB is properly tended, and
kept at a high State of Charge (SOC). Table 1 on page 2 shows multiple scenarios where
the DC/DC converter is providing a charge. Some of these key functions must be
understood in order to ensure the vehicle is able to maintain the 12 volt LAB.
The Extra Feeding function is an event where the DC/DC converter charges the 12 volt
LAB for 10 minutes. This event occurs every 24 hours, regardless of the 12 volt LAB’s
SOC, from the last ignition cycle and is intended to maintain the vehicle 12 volt LAB during
storage.
The Rescue Charging function is an event where the DC/DC converter will output a current
load, continuously for 2 hours, in order to recover the 12 volt LAB. During vehicle sleep, the
IPDM will wake up every 4 hours to check the 12 volt LAB’s voltage, and then go back to
sleep. If during one of these technical wake ups, the IPDM detects that the 12 volt LAB has
fallen below 11.2 volts it will initiate “Rescue Chargingâ€Â.
IMPORTANT:
During PDI: Ensure that the vehicle is in Ready Mode. Because of how the DC/DC
convertor operates, it is important to keep the vehicle in Ready Mode, so that while
completing the PDI the 12 volt LAB does not discharge and cause the vehicle to become
inoperable.
