@ShadowsPapa nicknamed it, "Duck Mode."
It only actuates in 4Lo.
I've used it with great results in snow.
A word of caution: if you're high-centered, or don't have some traction, DO NOT try it: it'll run the throttle up trying to increase speed, and the wheels will just spin!
I did some searching the other day, to no avail.
You can try contacting 3WLiners (I contacted him in the past through eBay) and see what’s up. Or try a generic module and fabricate your own harness.
Must-have mods (in no particular order):
-Headliner for noise & insulation. I went with Hot Heads, but others (Incl. OEM) are available.
-Some sort of steps for the short wife. I've got the nFab nerf steps. I like the look, but I've already had to replace them once due to corrosion.
I've said it before, the Truxedo Lo Pro is a great cover. I've been using them since 2006. The LoPro has a lifetime warranty, and they mean it. The cover I have on my SuperDuty has been nearly completely rebuilt under warranty; no questions asked.
A great cover with second-to-none customer...
The interior lights (I assume you mean the likes of the dome light) are controlled by the BCM (Body Control Module) which takes inputs from all the concerned switches and sends the appropriate voltage to lamps (LEDs.)
Here's the wiring diagram for the JL, which will give you an idea of what...
My Sport S had some left front wheel shimmy in sub-zero temperature two winters ago when I'd hit a road defect. Once the temperature warmed up (over 10º) the problem went away.
The dealer replaced the steering damper (seems their fix for nearly any front end issues) and the problem has not...