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Discussion Starter #1
I've spent a couple hours searching various JK forums and haven't found a good answer to whether or not there is a reverse signal wire located anywhere in the forward part of the cabin or under the dash. (It seems most people are just adapting backup cameras to the 430 head unit with all the various harnesses).

I have a couple of reasons for asking:

1. I have an aftermarket head unit (Sony AX-200) and it uses the reverse signal to automatically switch to backup camera view
2. I have some LED pod lights out back that are manually switched, but I'd like to have a relay to the reverse signal light that will trigger them automatically when I'm backing up
3. I am also thinking about installing a "beeper" for backup warning.

The latter two can obviously be done pretty easily by just using a wire tap in the back of the vehicle, but I've done a lot of marine wiring, and I like doing things like this with a covered terminal strip, and reducing the number of "home runs" that are made. (unlike the PO who ran wires all over the place!).

In other trucks I've had, there was usually a spot in the cabin where one could pick up the reverse signal cable - is this the case with the JKU?

Thanks!

Brent

Finally, if anyone has suggestions on a good way to mount a BU camera on a Smittybilt Atlas rear bumper (with tire carrier) please feel free to opine on that as well.

These Jeeps REALLY need a BU camera!
 

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I don't have an answer for you but rather a suggestion. Invest in a Factory Service Manual for your year Jeep. That was the first thing I bought back in '03 before I even took delivery of mine. The FSM includes detailed wiring diagrams will be invaluable to you.
 

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I don't have an answer for you but rather a suggestion. Invest in a Factory Service Manual for your year Jeep. That was the first thing I bought back in '03 before I even took delivery of mine. The FSM includes detailed wiring diagrams will be invaluable to you.
I agree, generally this is a very good suggestion, and historically I have always done that. However the last couple of vehicles I've owned, I've purchased them and then never opened them because getting first hand information from others (and sharing my first hand information) is generally so much more effective. :)

But you're right - as I was typing out my post, I was thinking "if I just had a good wiring diagram, I could figure this out on my own".

However, a lot of times a schematic doesn't tell you WHERE the wire is running. For example, in my old Tundra, there was a perfect spot in the vehicle's wiring harness to tap into the reverse light that was actually under the driver's seat. The schematic didn't tell me that - another member on a forum did. :)
 

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Pin 15 in the c5 connector is for back up lamps White with grey tracer. The c5 connector that it comes out of is a brown connector under the pdc or fuse box under the hood. Your going to have to run a wire from there.
 
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Discussion Starter #5



Pin 15 in the c5 connector is for back up lamps White with grey tracer. The c5 connector that it comes out of is a brown connector under the pdc or fuse box under the hood. Your going to have to run a wire from there.


So it sounds like there’s no pickup inside the cabin then. Thank you!


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I picked it up in the passenger rear corner. Don’t recall what wire I tapped, but the tail lights are right there.
 

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Discussion Starter #7
I picked it up in the passenger rear corner. Don’t recall what wire I tapped, but the tail lights are right there.


The carpet looks very easy to remove; perhaps I’ll just trace it back and see how close I can get to the head unit.

Then the big question becomes where to mount the BU camera on this smittybilt Atlas bumper. I like to run a cover in my spare so that eliminates the Alpine spare mount; but I don’t like the idea of the offset Crux mount (license plate frame)


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I just used 3m tape and stuck mine on the bumper. Not ideal, but works.

I also just powered the camera from the same reverse light lead.

Its in the wire harness that comes up from the tail light area.
 

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Discussion Starter #9
I just used 3m tape and stuck mine on the bumper. Not ideal, but works.



I also just powered the camera from the same reverse light lead.



Its in the wire harness that comes up from the tail light area.


I plan to continuously power the camera so I can monitor a trailer or see behind me while underway. I also plan to add a forward camera (which my HU will support) for parking/wheeling.


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I agree, generally this is a very good suggestion, and historically I have always done that. However the last couple of vehicles I've owned, I've purchased them and then never opened them because getting first hand information from others (and sharing my first hand information) is generally so much more effective. :)

But you're right - as I was typing out my post, I was thinking "if I just had a good wiring diagram, I could figure this out on my own".

However, a lot of times a schematic doesn't tell you WHERE the wire is running. For example, in my old Tundra, there was a perfect spot in the vehicle's wiring harness to tap into the reverse light that was actually under the driver's seat. The schematic didn't tell me that - another member on a forum did. :)
Agree this forum is a great source for sharing information and asking questions, and there is nothing wrong with that. However, spending a few minutes looking something up first can be very self satisfying and one can learn twenty other things along the way. The operational narrative sections in the MOPAR Factory Service Manuals are so interesting I find myself reading sections I don't even have a current reason too!

Not sure what wiring diagrams you've used before (Chilton and Haynes are garbage) but my MOPAR Factory Service Manual is very detailed in showing every connector location/pinout, wire purpose/color/gauge, and where/from is goes.
 

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Discussion Starter #11 (Edited)
Reverse light "tap" under dash or in the cabin of JKU?

Sounds like the Mopar manuals are better than other factory manuals, especially if there are “narrative” sections that can be studied. I don’t bother with aftermarket manuals - you’re right they are generally crap.

What’s the best source for them (besides dealer)? Nothing on Amazon and most I’m finding online either are bootleg PDFs or look suspicious.


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….What’s the best source for them (besides dealer)? Nothing on Amazon and most I’m finding online either are bootleg PDFs or look suspicious.


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It's been 16 years since I got mine but I'm pretty sure I got it from MOPAR Tech Authority....
https://www.techauthority.com/

Some other folks here may know other reliable vendors. I'm sure my searches wouldn't yield any more than yours.

Back then they offered hard copy "real" books but I don't see them any more, just CD's or downloads. I like my books because I'm old and like to flip through pages, don't like having a computer in the garage and can stick post-its with notes all over in it.

Here's a few pics of the size the product was for the 2004 Wrangler Factory Service Manual. It was the best damn thing I ever bought!
 

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Discussion Starter #13 (Edited)
Reverse light "tap" under dash or in the cabin of JKU?

Thanks! I too prefer hard copy. Trying to fiddle with an iPad while your hands are greasy is not a good thing. And I’ve found the hard way that iPads and 1/2” drive long handled socket wrenches don’t get along well...


Edit...

Whoops, looks like printed copies aren’t available. Argh. This is a deal killer for me; I don’t have a windows PC.



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^^ Roger that ^^ I just printed the 176 page advanced manual for my new Icom IC-9700 ham radio. You can't beat a hard copy for some situations.

I haven't calculated the cost per page but it's minimal for our HP laser all-in-one printer. It will print on both sides without user intervention.

Sometimes I'll just print a few pages of interest.
 
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