F/S CHG Relay
WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
The F/S CHG (fail-safe charge) relay supplies the driving power for the quick charge relay inside the DC/DC junction box. When VCM recognizes a quick charge start, VCM activates the F/S CHG relay to make the quick charge relay operable. During driving, F/S CHG relay remains OFF so that the quick charge relay is not activated.