Huachen vs. Brilliance

Brilliance China Automotive Holdings (BCAH) is a listed company. It has an informative website and publicly available annual reports. So I've come a long way understanding the group. However a few operating companies are missing from the BCAH website.

Now BCAH is owned by Huachen Automotive Group Holdings (a provincial government entity) for ~42%, the rest of the shares are public. I wonder if the companies I'm missing, are owned by Huachen directly, instead of indirectly through BCAH.

Shenyang Jinbei Vehicle Manufacturing Co Ltd
Makes JBC trucks and Jinbei pickups and light trucks. I guess this company is actually a BCAH subsidiary through several holding companies, including Shenyang Jinbei Automotive Industry Holdings Co Ltd and Shenyang Jinbei Automotive Co Ltd. It's not in the annual reports though, so can anyone confirm.

Brilliance Chongqing Xinyuan Automobile Co Ltd
This is the joint venture with Dongfang Xinyuan Holdings (Oriental Shineray Holdings). It's nowhere on the Brilliance website or annual reports. The Brilliance name suggests it's part of BCAH, or is it a joint venture between Huachen and Xinyuan?

Mianyang Huarui Automotive Co Ltd
It's a couple of factories producing cars for several other BCAH companies. Again I can't find it in the group structure.
I have a note that says it's a subsidiary of Southern Base Investment, a holding company registered in the British Virgin Islands. I also have a note that says that Southern Base was used as a vehicle to form Xinchen China Power Holdings Ltd, the engine making joint venture with Wuliangye Group and Southern Base was moved from direct subsidiary of BCAH to subsidiary of Xinchen China Power. If Mianyang Huarui is a subsidiary of Southern Base, it would be part of the Wuliangye joint venture.
I have a conflicting note that says Mianyang Huarui is a subsidiary of Shenyang Jinbei Vehicle Manufacturing. Or is Mianyang Huarui owned by Huachen directly? What is correct?