Originally Posted by Sango

What year is your IS?

For my 2011, the speed/tach, resets to their default values when battery is out. I verfied it yesterday it by setting the ring to go off at 100 km/h and unplugged it for about 1/2 hr. After I plugged it back in, the value reverted back to 120 km/h.

As per the seat belt, possibly, as I was double checking the seat belt setting this morning but most likely I believe it is ok.

The reason I did the unplug was days earlier, I was playing with the speed on/off and I did it too quickly that I ended up changing the default value by accident. Even I coudld eye ball it to move it to the the default value, I decided later on to just pull the battery out, since there is no "reset" like method to make it go to default.

Originally Posted by Hoovey2411

windows, navi, clock. I've unhooked my battery more times than I can count and I've never had to readjust the speed/tach indicator nor the passenger seat belt beep