The deal may signal that Chinese venture capital funds are once again favoring self-driving startups.
The new funds will be used to expand its long-haul service and develop a commercial self-driving truck.
The HD map maker advocates crowdsourcing to collect, contribute, and verify data.
Four major Chinese cities have allowed self-driving vehicle testing on designated roads.
The news follows a similar announcement made by rival Didi a day earlier.
Nio’s founder said the company will enhance the efficiency of its business operations to develop next-generation products.
This latest development comes after a testy public dispute broke out among the company’s management team in late January,
The financing comes shortly after AutoX moved its headquarters from Silicon Valley to Hong Kong, and opened a China R&D center in Shenzhen this year.
AutoX and Pony.ai had also granted first batch of licenses to conduct road testing in the southern Chinese city of Guangzhou.
Level 3 systems have been questioned with some test results suggesting human drivers are too trusting.