Honda has extended its production halt in Japan one week, through April 3, according to news wire reports from Tokyo.

Toyota, meantime, announced that it will re-start production in Japan Monday of Prius and two Lexus hybrids — the HS 250h and CT 200h -- even as it prepares to halt some North American production for lack of parts from Japan.

Mazda says it temporarily resumed partial production at its Hiroshima and Hofu plants on March 22, making replacement parts and parts for overseas production, as well as components needed to finish some partially built vehicles. The automaker says it will end production for the so-called "in-process" vehicles at Hofu on Mar. 28.

Even though Nissan is mulling the dramatic step of shipping engines from its Tennessee plant to Japan, it is otherwise trying to portray its U.S. situation as nearly normal:

Nissan notes that battery production for its Leaf electric cars resumed at the Oppama assembly and Zama battery plants Thursday, Mar. 24, but adds, "The ability to sustain production will depend to a large degree on the frequency of rolling blackouts due to electricity shortages. "

In the U.S., Nissan points out, inventories are robust -- "more than 260,000 units in dealer stock, at port or in transit from Japan," and that its Infiniti brand "is operating with more than 35,000 units of availability. These are both healthy stock situations and better than at the same point last year.

The automaker says it is telling dealers in the U.S. that "the company will follow a normal schedule for May ordering. All customer and dealer vehicle orders will be processed without delay and dealers will see no interruption in their ability to order Nissan or Infiniti vehicles."