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This is more than likely an internal fault in the instrument cluster since the other lights stay bright and you can control them. I suspect that you may need to remove the cluster and have it rebuilt to cure this problem
The sensor is usually located on the top of your dashboard. You might see it if you look into your vehicle through your windshield at your dash.
I have seen( one time ) that a gps was bright enough that it caused the dash lights not to come on because the sensor thought it was light outside.
Or you could have gotten a bad sensor.
Does the radio play ? Are any other back lighting components not lighting ? Does the HVAC control panel light up ? You probably need new radio !
The second interior lighting group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination, LED illumination and incandescent lamps.
When the ignition switch is turned to the RUN position, the radio VF display turns ON at maximum brightness. When the park lamps are ON, all incandescent and LED back lighting turn ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. At the same time all VF displays dim to match the indicated dimming level. The panel dimmer switch potentiometer is an input to the body control module (BCM). When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all VF displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.
That is a common problem, the switch needs changing if the high and low beams do work, the only problem is that it's an expensive part to replace, try a local wrecking yard they should have a bunch of suitable replacements at a reduced price.
I had a similar problem with my Camry that the light will go out when I go from dim to bright. I found that in the dimmer switch contacts there is a small plastic piece that runs through one or two contact to operate a set of contact. Mine was broken. Seeing that you have a new switch it could be that yours are maybe not correctly in place - that is if it works the same as a Camry's.
The solution is to replace (or possibly repair) the turn signal/dimmer switch. The switch has three contacts and a slide which control the bright lights and is filled with dielectric grease. When the temperature goes down the grease gets a little thicker and the slide won't work very well. The switch has two screws and one plug and can be accessed after removing the top steering column cover.
you could have a dimmer switch problem that may need an adjustment or replacement.do you hear the switch click when you try to change from high to low,if not than these could be the problem.the switch is located on the top of the steering colume and the base of the colume under the dash.if you work the dimmer switch on the colume and put your hand on the colume under the dash you should be able to feel the rod that pushes on the switch.follow the rod down and it will go to the dimmer switch.there are 2 5/16 bolts that hold it in place that if you loosen them and push the switch up towards the steering wheel it will move it so the rod won`t have to move as far to change from low to high.if this is not the problem and you don`t hear a click then its usually a switch replacement.
are the bulbs good of so the dimmer switch is bad on the columb you can unplug one of the lights and see if there is power on one wire in the dim position and then power on the other on high if not its the dimmer switch