Richard Shiozaki, senior vice president of Denso Products and Services Americas, says the deal is part of a long-term strategy to offer new value for mobility.
Ease will now merge with Denso Products and Services America, an automotive components subsidiary based in California.
Ease also offers automotive inspection software, automotive emissions equipment and automotive telematics systems.
In 2014, Denso acquired 72% of Ease in a bid to help develop its vehicle diagnostic and telematics business in North America.
Driver safety is also a priority for Denso. In Japan, the company launched a retrofittable %$Linker:
The monitor voices an alert if the driver is not paying attention or is seated inappropriately.