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Thread: How do the lockers on a Rubicon work? Reply to Thread
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Topic Review (Newest First)
08-08-2009 01:35 PM
jk'n I hadn't looked at the ECU /wheel speed box connection too closely. I would have to have an understanding of the signal passing through that wire to know how that half of the switch works. The mod he posted was a diagram from some other forum he added the locker switching modification according to his post. Now just looking at that side of the switch from a logic standpoint without defining the signal travelling on the purple with light blue tracer wire, if that is normally connected without the switch, then it would make sense that disconnecting it would modify the signal and prevent the ESP from activating (I'm speculating). If that is the case, then you would want that open when the lockers are forced to the locked position. That would actually require a double pole double throw swtich DPDT. With the double pole single throw switch DPST that he has depicted, it looks like the ESP would be off while the lockers are not being forced to lock and ESP on with the lockers locked.

Quote:
Originally Posted by Codeman911 View Post
Jk'n, lookin at that diagram I wonder why you would have to tie into the ecu and the wheel speed box? Couldn't you just run a wire to the relays like you have shown and then hook you toggle to a power wire that's hot with key on so any time you flip the switch they lock?
Now to answer your question about running a wire from hot to the relay, please observe the way the the circuit is currently wired. The top of the relay coils for both lockers and the common of the relay contacts on both lockers are wired to the line that looks like it is labelled S152 (it is blurry) if you follow that line up it goes through a 25 amp fuse to hot so the top side of both relay coils is positive 12V. The bottom of the relay coil if grounded, will activate the coil and thus the contacts would operate and the lockers will lock. The output of the module on pins 41 and 42 are known as current syncing outputs. When an input causes the output to activate, it basically brings the output to ground otherwise the output is "hi z" or not connected to ground or floating. Without putting the diodes in there as I had shown in my modification of his diagram, because pins 41 and 42 are connected by a wire in his diagram, either output syncing to ground will cause both relays to activate with the switch in the off position (open switch). This would not allow the circuit to operate as the factory wiring intended it to with the switch in the off position. The factory wiring allows the rears only locked or both front and rear locked. With the diodes in there, either output can be low without effecting the other output while the switch is off. When the switch is on both outputs would be synced to ground through the diodes and both lockers would lock regardless of the condition of the outputs on pins 41 and 42.

I'm pretty sure that you would want to make the other side of the switch to be open when the lockers are forced on and closed when the lockers are not forced on. So basically when the locker side of the switch is open, the ESP side should be closed. and when the locker side is closed forcing lock, the other side should be open preventing ESP from coming on. Again, that would require a double pole double throw type switch that has two positions on/on, they do make a three position switch on/off/on. On the three position switch, the common is not connected to either side when in the center position and that would not be required in this application.

Now, I hope I haven't totally confused you.
08-08-2009 11:19 AM
Codeman911 Jk'n, lookin at that diagram I wonder why you would have to tie into the ecu and the wheel speed box? Couldn't you just run a wire to the relays like you have shown and then hook you toggle to a power wire that's hot with key on so any time you flip the switch they lock?
08-07-2009 05:03 PM
jk'n Someone posted this thread a while back. As you will be able to tell if you read the whole thread, there was a discussion back and forth as to the need to isolate the two outputs with diodes but generally speaking, I think the circuit would work either way. Just without the diodes, the front and rear would not be able to be operated independently like the factory provided circuit does. If you try the mod, let the forum know how it works out.
08-07-2009 03:54 PM
silvrevo So in 4 hi,, they dont lock up,,, are they limited slip thou?

4 low is like what ,, upto 10mph? You can get a rear locker on a X model,, and I think Sharaha has front and rear too...

I hate it when only one wheel spinns when u get on it. and or need both.
08-07-2009 03:41 PM
Codeman911 I see now. Not what I thought it would have been but I see now! Thanks for the pic Bro! I'm gonna do some looking for that hack!
08-07-2009 03:07 PM
N39-W120
Quote:
Originally Posted by Codeman911 View Post
Any way to get them to lock up in 4H? Plus, where do the sway bars disconect? I looked under there and I don't see any actuators or anything like that. They look like sway bars to me.
I have seen some "hacks" to beable to use the lockers in 4H but don't quite remember where... as for the sway bar disconnect, it works it's magic from around the center. If ya look at it with out the jeep you might figure it out
Attachment 10329
08-07-2009 02:50 PM
Codeman911 Any way to get them to lock up in 4H? Plus, where do the sway bars disconect? I looked under there and I don't see any actuators or anything like that. They look like sway bars to me.
08-07-2009 02:47 PM
N39-W120 If you are in a real hurry you can download here. Also the lockers will only engage while in 4L, then they will be solid
08-07-2009 02:03 PM
SpeedJunkie Sway bar disconnect is just the front. The lockers are electronic and locked when you engage them.
08-07-2009 02:02 PM
deekum1627 there electronic
08-07-2009 02:01 PM
Codeman911
How do the lockers on a Rubicon work?

I just picked up my first Jeep yesterday and I'm still grinnin' ear to ear! But it didn't have an owners manual, so I ordered one on ebay. But I am impatient and am not sure of a couple things. The electronic sway bay disconnect on my 07, is that front and rear sways? Also, when I hit the locker button, the front and rear lock symbols just flash on the dash. Does that mean they are locked up? Any info will help. Thanks!

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