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Old 03-13-2014, 11:24 AM
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"Right Turn signal on" message. Electrical gurus NEEDED

Ok, this is my first post as I normally visit JF for help. But after looking at some of yalls post, yall seem to be more technically inclined. A lot of this is going to be copied from JF, so bear with me.

So my problem is is I have a "Right Turn Signal On" message popping up on the overhead display. I know there is something funny on that side as I previously (as in 2 years ago) tried to install some LED side marker/arrows on behind the mirrors. I tapped into the rear signal wires along the door sill on each side and it should have been an easy job. The drivers side worked like it should. Only lit up when the left turn signal was on. The passenger side acted funny. It was fine when the park lights were NOT on, but when they were ON, the LEDs would dim lightly and flash in short bursts. I measured the voltage when the lights were on and had a constant 4v going to that side of the car (also did it when I tried to run a relay hoping the 4v wouldn't trigger the relay and only the 12v to activate the rear signal would, to no success). So, it only happened a few times over the course of a year or so and now, over this last year, it is every time I travel more than a mile with my park lights/headlights on. I hoped this extra voltage was caused by one of the bulb sockets crossfeeding the turn signal and park light signal, so I changed the front inner and side marker sockets to no avail. Still does it. I thought it could have been with the stalk, so I checked it.

I looked on Wjjeeps at the junction block pinouts and found that Junction Block C3 has a "Right turn signal sense" wire on cavity 4 (LB/YL). There is also a "left turn signal sense". Does anybody know where that Junction Block C3 is located? I was going to compare the voltages between the two and see if that gets me anywhere. Would be really nice if I could just snip the wire...

So I went out and tested the turn signal sense wires at the turn signal stalk. I've come to the conclusion they are there to send the signal from the stalk to the flasher relays, which then activate and send the power to the appropriate side to flash.

Here are the wires.


Per the FSM, the Left signal sense wire is LB/WT and the Right is LB/YL.

With the running lights ON AND OFF, I measured:
-11v on both with no signal on
-Right arrow on:
-LB/WT fluctuated and LB/YL was 0v
-Left arrow on:
-LB/YL fluctuated and LB/WT was 0v

So the stalk seems to be working fine. Odd that there is voltage on the right signal wire when the left signal is on an vice versa...

So, in conclusion, the Stalk is fine, the flasher relay LOOKS fine (no breaks in the solder or anything), the sockets are new, the wiring from driver and passenger side is the same, everything works like it should, except for that constant voltage on the passenger side and that damn message.

The thing I wonder is if the signal from the stalk goes through the flasher relay and then to the BCM then to the lights, or if the BCM is last in line. Maybe there is a way to make the BCM think the turn signal is off even when it really isn't...

I wish the flasher relay is the culprit, but since it only happens when the running lights are on, and that relay doesn't mess with the running lights, I doubt that's it.
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Old 03-13-2014, 11:41 AM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Anybody know where Junction Block C3 is? C1 and C2 are below the flasher relay, can't find where C3 is though.
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Old 03-13-2014, 09:43 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Welcome to the garage.
Connector C3 from the junction block sits on the opposite side, just above the BCM. I never tried it, but i think you will have to remove the JB to get access to connector C3.
The flasher relay is an IC controlled relay, so messing with LEDīs could be (part of) the problem. I will have a look into the schematic and see if i can come up with something.
Attached Files
File Type: pdf JB C3.pdf (65.9 KB, 4 views)
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Old 03-14-2014, 06:09 AM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Thanks for the help. I kinda figured it was back there after looking at a few videos on YouTube. LEDs shouldn't be the problem as they are not hooked up anymore (not for over 2 years actually). Someone on JF said they remember an older thread about the wires behind the passenger kick panel getting wet, expanding/swelling and turning green, and causing some problems (don't know if they broke the plastic and grounded out or what). So I'm going to check that out this weekend and redo all the wiring by the front passenger headlamp just to make sure everything is ok.
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Old 03-14-2014, 07:49 AM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

I would look at the connectors, where both the turn signal wire and park lamp wire run through. In the cabin its C106 and close to the right headlight C112. See attached position locations. The connector pins can corrode and this green stuff can give false connections
Attached Files
File Type: pdf C106.pdf (58.7 KB, 5 views)
File Type: pdf C112.pdf (154.1 KB, 5 views)
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Old 03-19-2014, 10:28 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Any news on the turn signal problem?
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Old 03-19-2014, 10:59 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Not yet. Haven't had a chance to look at it. NC weather has been quite crappy the last few days. I did notice some green wires when I replaced the outer bulb holder, so I'm hoping I can find how far it goes back from there and just replace the whole harness. But I'll keep y'all informed when I get a chance to look at it.
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Old 03-19-2014, 11:05 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Since you have a false voltage supply, i would focus on connectors, where the park and signal wires run through. I supplied you two manual pages with two suspected connectors, the C106 and C112.
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Old 03-20-2014, 11:39 AM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

I saw both of them and will give them a look. Thanks for your help! I'll post back when I have a chance to look them over.
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Old 04-03-2014, 12:02 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Ok, so I had some time to check out the junction block and connectors and everything seemed fine. No visible corrosion or anything.

This is the C112 below the passenger headlight.



I didn't take any pics of the C106, but it is clean and dry.

So, I gave the dealership a call and asked if they sold just the headlight harness from the C112 to the bulbs and they do. It's not a "stock item" for dealerships, but someone had ordered one before and never picked it up. So he gave me the, normally $70 harness, for $20 just to get it off his shelf. The only thing is it doesn't list a right and left side, so when I installed it and put the bumper back on (yes, you have to remove the front bumper to get to the connector), none of the lights worked. I didn't even think to compare the pins between the old and new connector, so I'll pull that back off tomorrow and see (it started raining). I guess the new harness is for the driver's side and might have a slightly different pin layout than the passenger. I hope so anyways...

On another note, when I drove to the dealership, I had the harness disconnected and it didn't give me the message when I had my park lights on like it normally did, so that was night for a change...

A quick question for Frango or anyone else), I was looking at the pdf you sent of the C112. I noticed the harness that attaches to the goes to the fuse box under the hood. Is there any fuses/relays I should check in there? Or do the turn signal and park lamp wires just run through it and are not "broken" by a connector?
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Old 04-03-2014, 12:57 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

Another update. The sun decided to pop back out, so I pulled the front bumper and and checked the connector. It was the same as the old, so I looked at the bulbs and had 2 that were broke at the base. The aftermarket sockets I had replaced a few weeks ago were not the best engineered and cracked two of the bases of the 194 bulbs. Switched those out with some new ones and the harness works like it should. I still need to tap into it for my HID relay harness and for the 3 194 bulbs the V3 aftermarket housings have, but I'm going to wait and do that after I try out the new harness first and see if it gives me the same message. If the new harness works and there is no message, I'll hook up the headlights and then the other turn signal bulbs.
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Old 04-03-2014, 05:21 PM
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Re: "Right Turn signal on" message. Electrical gurus NEEDED

So sorry for all the posts today. Its my first day I've really got to work on it and I'm just trying to update as much as possible. I took it for a drive with just the park lamps on and the message never popped up. The trip was a good 6-7 miles, so hopefully this harness fixed it. I hooked up the signal wires for my HID ballasts and am going to drove around tonight and hope that it stays off. If so, then I'll wire up the 3 194 bulbs for the V3 housings and then the relays for my added park lights in my fogs. My buddy has my DMM, so I can't check any voltages yet, but my plan is to check the wire that I was originally going to tap into for my side LED arrows and see if it still shows 4v. If not, then I should be good to go and can get those hooked up.

Just took another 15-20 minute trip with my park lamps and headlights on and no message!! Next is the 3 194 bulbs and then hopefully the LED side markers in my mirrors I've had ready to go for over 2 years...
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