I think someone above is correct, if you have the right wheel all the way up, you cannot control the ambient lights with the left. If you back the right wheel down just past the notch, you can then control ambient light brightness with the left all the way from full bright at the top, to completely off if rotated all the way down. Not having the right wheel set correctly is probably where your problem lies. Mine works in Auto, On, and Parking light positions from the master switch, so that position setting is not your problem.Does it matter where the light switch is?
Off, auto etc
Also how dim does it go? Mayne I am expecting to much?
But if i turn it down to the "bump" it should turn them right off correct?