Only models 806 and 906 had a tub light in the '06 series.
Earlier models are A700 and A702, A160, A900, A902.
It turns on as designed when the lid is open and the timer knob is pulled out. The tub light is available for loading by pulling the timer out presumably even at a cycle Off position. The lid could be left open without the tub light with the timer pushed in. It requires a different lid switch (double-pole, single-throw) and presumably the timer to have a wiring terminal for it, although something could be rigged-up to operate it manually.