[0xfae]

In NACS the DC and AC pins are the same pins. The car only connects the charge port pins to either the AC/DC charger or to the DC battery after it communicates with the charger and tells the charger what voltage / amps it wants.

[p1mrx]

You are describing the behavior of a NACS vehicle. I'm wondering what happens if you connect a DC charger to the AC pins of a CCS1 vehicle, and then start the DC handshake.

If the DC charger is required to passively sense the battery voltage before charging, then it's probably fine. Otherwise, magic smoke!