What is this wire?

Markham

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I found this wire just chilling on the passenger side. It has a long black plastic cap on the end of it. I just tucked it back in the side panel, but anyone know what it is?

857E8247-E9E8-49B2-9D6E-CAE264546F25.jpeg



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JeepU4IA

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Maybe the factory installed the wiring harness for the aux switches in error. If so, it will be super easy to install the switch bank. See if you have similar unconnected cable leads near the battery.
 

Gregj

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I believe that is the Brake Signal wire for the Trailer Brake Controller,


Ok. I think I found it. On the passenger side footwell, behind the plastic, near where the door’s connector is, lives the BCM. On a tow-package factory equipped JL the provided harness taps the signal from the The Dark green with a white stripe wire going to pin 18 of the BCM.

I used this post as a reference; https://www.jlwranglerforums.com/forum/threads/jeep-jl-wrangler-wiring-diagrams.19185/
Gregj
 

Gregj

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Arterius2

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I believe that is just the wire that comes out of the BCM that would go to the Trailer Tow Package, @Markham doesn't say if he has Trailer Tow or not but if you look at the wiring diagram it does show a dark green/white wire coming out of the BCM to the Aftermarket Electric Brake Module.
https://www.jlwranglerforums.com/JL-Wiring-Diagrams/TRAILER-TOW-SYSTEM.pdf

Gregj
He says he doesn’t have aux switches(HD electrical), for 2018 JL trailer tow and HD electrical is one package..
 

Gregj

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So, I looked at the brake controller connector under the dash of mine and one of the wires is dark green/white as appears in the wire diagram I linked to earlier. Maybe FCA knows some folks may want to add trailer tow after purchase and provides a place for this connection to happen.

Just my SWAG (scientific wild a** guess)

Gregj
 
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Markham

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No tow package
 

Gregj

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