Why is dimmer switch not working

. The illumination is controlled by the BCM - body control module .
Interior Lamps Dimming
This group includes lamps which may dim. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
• HVAC control module, head assembly
• Rear HVAC control module, head assembly
• Radio
• Rear seat Audio
• The instrument panel cluster (IPC)
• The PRNDL lamp, with the exception of the current gear select position
• Power window switches
• Various switches
When the ignition switch is turned to the ON position, the VF display, radio, turns ON at maximum brightness. When the park lamps are ON, all incandescent 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. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the I/P dimmer switch through the I/P dimming lamps control circuit. The setting of the I/P dimmer switch determines the amount of voltage that the I/P dimmer switch supplies to the BCM through the I/P dimming lamps low reference circuit. The BCM then sends a pulse width modulation (PWM) voltage to all the interior lamps. All the VF and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the park lamp or headlamp position, all incandescent back lighting turn ON at the dimming level indicated by the I/P dimmer switch. 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.


Do you know what DTC'S - diagnostic trouble codes are ? Codes set in the BCM
DTC B2610 00: Passenger Compartment Dimming 1 Circuit
DTC B2615 00: Passenger Compartment Dimming 2 Circuit
DTC B2652 00: Passenger Compartment Dimming 3
Circuit/System Description
The instrument panel (I/P) lamp dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the I/P lamps supply voltage circuit and the interior backlighting components dim to the requested level. Ground for the I/P dimmer switch is provided at G201.

sunroof fuse 1 20amp / power windows - circuit breaker 25 amp
both of these are located in the instrument panel fuse box .

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

is it adjusted by the light switch left on bright right dim all when lights are on all dash lights will dim thats normal

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.

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

Dimmer switch is going bad. If you rapid fire the switch they will switch from bright to dim or dim to bright. replace the colum switch.