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.