I was able to find the settings for this function and verified that the timers and pickup sensor are turned on. The back light however will not turn off. It is draining the battery in about one hour.

Is there a trick or something I can check to get the back light to turn off?

I have to confess that this remote has had a somewhat difficult life so far. It's had a couple drinks spilled on it... It may just be time to put it out of its misery.