usually this is the master switch in the centre console acting up. Could also be a motor or regulator but try another switch first.
How to remove Window Winder Handles from VZ Holden Commodore
Electric or manual?
If it is electric windows it is the motor which needs replacing or it could be the regulator
Begin by removing the inside door panel. Remove the wiring harness from the electric window regulator. Remove the window regulator retaining screws.
Busted switch, motor or wiring.
brake the window
The electric windows on a 406 might behave weird if you disconnect the battery. But holding down the "window-down" on drivers side for 10 seconds or so should fix it.
Plastic thing that attaches window glass to the window motor might be broken.
behind the dash, located behine the fuses on the drivers side
Window motor i'd say. Both of mine have given up. €270 from Toyota for one, they can be had for £20 from eBay
It could be your window regulator.
If it is electric it's switch is on the drivers door next to the switches for the front windows