Someone on the internet is claiming that if you ever see the 3rd charging indicator light b\nking while not plugged in that this means the car is topping off the 12V battery. The claim is that this information is in the manual.
I highly doubt this as it would mean the car has to 1. be monitoring the voltage of the 12V battery, which it clearly doesn't, and then 2. AUTONOMOUSLY PHYSICALLY CONNECT THE TRACTION BATTERY in order to run the DC-DC charger. That seems to go against the whole point of physically disconnecting the traction battery when off. What if you were working on the car and it suddenly does this?
I highly doubt this as it would mean the car has to 1. be monitoring the voltage of the 12V battery, which it clearly doesn't, and then 2. AUTONOMOUSLY PHYSICALLY CONNECT THE TRACTION BATTERY in order to run the DC-DC charger. That seems to go against the whole point of physically disconnecting the traction battery when off. What if you were working on the car and it suddenly does this?