This may sound silly or maybe even just plain nitpicky, but can anyone tell me exactly what is causing the high pitch sound that I've been hearing with the windows down now that its been warmer out. I have a 2007 TL base and that sound is more pronounced when I drive into my garage or pull up to a drive thru or ATM. It doesn't sound like is coming from the engine. It almost sounds like the fuel pump but its appears to be coming from under the middle of the car. Yesterday, I was walking by another idling 2007 in a parking lot and heard that same high pitch sound.

I can't figure out what's causing that sound but it appears to be normal for the 2007's. I wonder if Acura substituted any parts to keep costs down by replacing them with something of a lesser quality.