Mazda :: Electronic Controls Scrambled - Radio Making Static Sound When Went Over A Bump

In Jan my radio began to make a static sound when I went over a bump, and then would go off. I discovered I could turn off the engine, and the radio would come back on. Eventually it stopped working altogether. A few weeks later, the turn signals stopped working, then the speedometer/odometer, then the cabin light, then the brake lights. Sometimes the windshield wiper goes on in the 'clean' cycle where water is squirted onto the windshield, and the wiper wipes. This feature has never worked before.

I have owned the vehicle (Mazda pickup 1998 B2300) for 2 years. I found soon after buying the vehicle there is a 'Timer Control Module' circuit board behind the radio in the dash which, when unplugged, will disable the functions mentioned above. Is this board the problem??