I have imported a car from japan fitted with the Sanyo NVA-280 audio system. But all manual and instructions are in japanese. May I have a have a mnual for this model in english? Also is there an option which prevents the video from playing while the car is moving?

1. Contact honda and ask them
2. RTM read the manual, from same place.
3. if car is JDM made for Japan only there my be no cure.

try resetting it to default settings

If you bought it in Japan, chances are it is a domestic model with no means of changing the language. If not, then it will be a setting in the menu system - look in the manual

Although not sure of the model, Try this site.
SANYO NVA HD 1100 Manuals
Some or all manuals are chargeable.

The useful navigation system can be thought of as useless when it is set to display the information in the wrong language. For example, you bought the factory or aftermarket systems from japan, then it is common for you to see the information displayed in japanese rather than English. Sometimes, you can fit it easily within a few steps, but it may require the extra software or professional servicing in order to Change Japanese Car Navigation into English.
Instructions
1
Switch off then turn on the vehicle and find out a button in "English." Some cars come with the feature of changing language once the car is on.

source: http://www.oemcargps.com/blog/how-to-change-japanese-car-navigation-into-english

HONDA INTERNAVI CAR NAVIGATION SYSTEM
I am in srilankan. I have bought a 2010 Honda Cr z imported from Japan. The car has an imporessive Honda Internavi Car Navigation System which intergrates Japanese GPS, mobile phone, reversing camera, audio, TV, DVD, CD etc on a touch screen and steering wheel control BUT all graphics and buttons are in Japanese script. Unfortunately the car didn't come with any instruction manuals. I want to know anything anyone else might know about the entire system, in English language please.

The audio system seems to rip CDS to a HDD.
The radio still receives a Japanese station
The TV picks up some local channels but only audio
The GPS still reads Japanese cities but is active, as if we are driving in Japan!

Plesae contact me if you might be able to help with providing English language instructions manuals, or information about how software might be updated to srilanka GPS and English instructions.

Cheers experts!

Its Japan domestic model and instruction manual would also be in Japanese.

Im in Pakistan with my Honda Insight 2011, Japanese import. No idea what the buttons say. It would be amazing if a Japanese person translates the buttons atleast.

would you like to sell it to me I live in japan and need one bad. Thanks.

you may have a manual reset button on the face of the radio or behind the detachable face. This button can be accessed with either a paper clip or a ball point pen and should be pressed with the radio turned on.