Toyota has been the hardest hit, with a loss of 260,000 units as of April 8. The automaker has a total of 18 domestic manufacturing facilities, and while two of those are back online, the remainder won't open their doors until at least April 18. Even then, the plants may shut down again after April 27.
Honda, Suzuki, Subaru, Nissan, Mazda and Mitsubishi are all operating on some level, though production is an on-again, off-again affair. As an example, Nissan has managed to re-open all five of its Japanese facilities, though production has been scaled back to half-pace for the time being. There's no word as to when full production will ramp up once again.