Electrical problems

[E-BayX5er]

My wife has a 2001 3.0 X5 with about 87,000 miles. The other day things started to go crazy with the electrical system. The radio stopped working and some of the lighted buttons also stopped working, the seat belt light stays on now even when seat belts are buckled, the air bag light stays on, brake light stays on, air bag light stays on, seat belt light stays on, A/C work intermitantly, and now sometimes the interior dome light will not shut off. Just today a (Trans. Failsafe Program) message flashed on the dashboard.

Someone told me the battery maybe low so I load tested it and it is still putting out about 11.5 volts.

Anyone else have this same problem? What was the cause and was the dealer able to fix it?