According to the article of Reuters on August 11, 2010, some of Japanese big manufacturers tend to refrain from export to Iran.
Perhaps this is an action considering recent Japanese government's announcement of Iranian sanction and following current international situation.
(METI web site: Measures based on FEFTL to Address the United Nations Security Council Resolutions on Iran:
Comment from each companies are as follows.
TOYOTA: Suspending all commercial vehicles export to Iran from June 2010, considering current international status. Keep monitoring the situation. Toyota exported commercial cars to Iran 4,000 vehicles in 2008, and 250 vehicles in 2009.
NIPPON STEEL CORPORATION: Keep exporting steel material to Iran (without disclosing the amount of the export), but with careful attention of security trade control by consulting with METI.
JFE HOLDINGS: Keep exporting certain amount of steel products with careful screening of end-user and end-user by internal compliance procedure.
HONDA: No sales of vehicles in Iran.
MITSUBISHI HEAVY INDUSTRIES: Exporting after-service parts of plant, but with complaiance of both Japan and U.S. export control. Especially, checking severely whether containing the US origin goods or technologies.
KOMATSU: Exporting small amount of constructing machines with following guideline of Japan.
In Japan, the export to Iran is not complete embargo, and it is still lawful to export goods and technologies as long as it is non-WMD related.
However, recent government's sanction in US, EU and Japan have some effect to business decision of global players. The financial transaction with Iranian players are getting very difficult, naturally this makes companies avoid business with Iran.