1993 Buick Riviera "mmcs mitsubishi" Questions

What can cause my MMCS, power locks, side mirror control, and AC blower fan to all go out at the same time? A few weeks ago while driving my battery light began to flash erratically and once I stopped

...your dash (very unlikely). there are a websites out there that have the downloads for firmware updates http://www.mitsubishi-motors.com/download/mmcs/e/down_mmcs_01.html Good luck. I hope this