I took my RAV4 into toyota because shortly after purchasing it (used, at 48,000 mi) I noticed a high pitched, electronic sounding whine that is most noticeable in the passenger side (but believe me the driver hears it too) beginning at 43mph, and fading (perhaps drowned out by wind/road noise) at around 70mph (it ALWAYS starts at 43 mph). The sound reminds me of the chirping, whining noise we used to hear when we'd get online using dialup modems, but not quite as varied; ie: a more even tone, but high pitched and whiney. When you take your foot off the gas, the tone varies (pitch and volume lower) and when you put your foot back on the gas, the noise comes right back up. It has become impossible to drive without the radio up quite loud, as the noise is truly annoying.
Anyhoo.... Toyota dealership says "Yes! There is a TSB on this and we will fix it for you!" Long story short, they get the parts, go to put them in, the parts dont fit and they figure out the TSB fix is ONLY for the V6 model. They say there is nothing they can do on the 4 cylinder model, despite the fact that they considered the sound to be identical to what the V6 makes.
Have any other 4 cylinder owners noticed this sound under these circumstances? Any chance it is something other than the transaxle/transmission? When I first heard it I assumed it was something to do with the computer unit.