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Old 02-09-2015, 07:45 PM
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Another Dimmer Circuit Question - This Time a 2014

At the risk of asking a question that I know has been asked numerous times over the years that the JK has been around......I have searched the internetty far and wide and have yet to find a thread that helps me find the instrument panel dimmer circuit on my 2014 Sport.

I have come across tons of references especially if the JK has electric windows and door locks.

I ended up purchasing a fancy set of Fluke test leads that allowed me to start testing the individual pins in the climate control plugs, the radio plugs, and the under dash (foot well) LED lighting. I could not find a circuit that would respond to the dimmer controls.

I can only assume that there have been some significant changes recently in the wiring of JKs. Has anyone been successful identifying a dimmer circuit wire on a 2014 or later JK Sport without electric windows or door locks?

Thanks for any insight you may have.

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Old 02-09-2015, 08:34 PM   #2
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The ambient LED footwell lighting dims. You will find that their is two LED lights. One is for the interior lighting when a door is opened and the other is active when the parking lights and/or headlights are on. That is the LED you want to use.

Originally I assumed that it did not dim but it does. I spliced into it thinking it would be a great 12v reference signal to turn on the backlighting for my emergency lighting controller. I made the connection and when I dimmed the dash lights the backlighting started to flicker.

Use your multimeter and probe the wires that go to the LED and look for a voltage change when you dim your dashlights

I have a 2014 JKU Sahara

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Old 02-10-2015, 06:30 AM   #3
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Maybe the footwell LED is dimmed using pulse width modulation (PWM)??? PWM might not work with some types of backlighting.
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Old 02-17-2015, 06:30 PM
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Well, it is official: I am a cabbage head. When I tapped into the orange/gray wire in the foot well to access the dimmer circuit, I had to unwrap quite a bit of the mesh harness protector. I must have accidently cut the orange/gray wire while cutting away at the protector and I didn't notice it.

I re-connected the wire and yes, that is the dimmer circuit. I then tested the dimmer capability with an ISSPRO air pressure gauge I am installing. The gauge lighting responded to the first two clicks (high to low). On the third click of the dimmer the air pressure gauge lighting was flashing and on the fourth click the air pressure gauge lighting was off completely.

To avoid this foolishness, I have decided to install a separate rheostat running off of an ignition switched 12V source to control the lighting of the OTRATTW switches and the ISSPRO air gauge I am installing in an S-Pod panel.

Thanks to those that responded.

Robert
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