The Japanese New Car Assessment Program provides crashtest information for Japanese domestic vehicles.
As with any crashtest, you should also be aware that any test result means only that a vehicle gives good or bad front and side crash protection in a collision with a solid object such as a lamppost, or a vehicle of similar weight. In actual road smashes the driver of a smaller (lighter) car is far more likely to die than the driver of the larger (heavier) vehicle it collides with.