What is happening. While driving I often get 3 beaps.

[blaubenz]

While driving I often get 3 quick beaps. I look for check engine lights or warning lights don't see anything. I press the right black pin sticking out near the guage and it reads check control o.k. It is while driving (not at start up)

So what is happening? what are the beaps for?? I know a single ping or beap is alarmed when the temp reach 37 deg F for freeze warning.

thanks