My 2004 Escalade is acting up. First the T/C light comes on, the Brake & ASB light comes on. Then chimmer rings constantly. Then Radio goes out. Then dash lights come on. Then all dash instruments fail and go to zero (gas, alt, oil, temp), all the while the chimmer is ringing. Then doors and windows fail to operate. I turn off the ignition, the chimmer continues, doors still do not work, finally after a few minutes things go to normal, everything works...what do you think?