Just tested before - I think its dead. No noise - nothing. I also note that the power supply I have actually delivers a really high-pitched noise when it is on. When you connect it to something, that noise goes away. In this case, when I connect to the terminals, the noise remains. I'm going to have to get inside to look further. Unfortunately, I simply don't have the room to do a job like that.
Geoff, did you have any luck getting yours out through the inspection hole mate? I'd seen a few Lexus owners actually cut the inspection hole to get this part out without dropping the tank. Each to their own, but I'm looking to avoid anything that invasive....