hey guys,
2011 F250 6.2L. bought it with those LED lights installed in the reverse lights, where they just cut and spliced behind each rear light assembly. at some point they stopped working, dont know when, failed inspection recently. been messing with for a long time trying to figure this out. I hear that the LED lights can cause issues, but WHAT issues? because mine just wont work, and I am not sure why. what does it ruin? I think I have a bad fuse box. along the frame under driver door, I have cut the blue/white wire and powered from there and they work fine. then after that is when it starts to get weird.

1. if check continuity from the blue/white wire (where i cut along the frame) up to the relay in the fuse box, I have continuity ONLY to the #3 terminal
2. if I check continuity from the BCM connector up the relay (which I am super confused about the BCM connector and terminal location. none of the #13 positions on ANY of the BCM plugs have a blue/white wire on them, so that bugs me out and is frustrating) I only have continuity to the #3 relay terminal also
3. I have power coming in #70 fuse, and a good fuse. I have power coming in the #3 relay terminal also, so thats good, BUT
4. When i pull the fuse out - it should be the side of the fuse WITHOUT power coming in that should have continuity to the #3 relay terminal - except its NOT, its the side WITH power coming in that has continuity to the #3 relay terminal (with the fuse removed)
5. when I jump power to the #1 relay terminal, nothing happens at the lights

all of this is super weird. I think the fuse box is junk? I have seen tons of chrysler TIPM boxes go bad, any issues with these? what are the exact issues the LED's cause, I see lots of people say they quit working after sometime, but dont really give full description of what the problem is

 

Bump. Also want to add that I have no codes pertaining to anything transmission or reverse related, in any module. When I shift it into reverse, the range sensor does recognize that it is in reverse.

 

1. The relay and its associated fuse and circuitry is for the reversing lamps on the 7-pin trailer harness, not the truck's reversing lamps. If the BCM is actually activating the truck's reversing lamps, that relay should also energize at the same time. The only wire at the trailer reversing lamp relay that is of concern is the one that goes to pin #1. See schematic.

2. Did you use a scan tool that is known to have the capability of reading the BCM's status and the extended fault codes.

3. Most likely, the BCM determined that there was a fault in that circuit and disabled it as part of the FET protection scheme. A capable scan tool is required to reset that condition, if present.

 

Yes, I used a snap-on modus, no codes in the BCM. will there be a code if something needs to be reset?
I understand better now the purpose of the relay. but doesnt make sense to me that there is continuity from pin 3 of relay to the NON-power side of the fuse 70 (with the fuse pulled)
and that there is continuity from the blue/white wire along the frame to the #3 relay terminal as well.
And even if the BCM has disabled it, if circuitry was correct, I should be able to power my reverse lights by jumping power to the #1 relay terminal, correct?

I looked at the pin-out diagram too of the connector. the BCM is the unit with the fuses behind the right kick panel, correct? that wire on mine is not blue/white. will check again just to make sure I did do something wrong, but I remember not even being able to find the same color blue/white wire anywhere going to that connector

 

Here I have shown pics of the BCM connector that I would like clarification on.
1. do I have the right connector? at the fusebox/bcm? behind the right kick panel
2. am i holding the connector the right way? have the lock tap closed off the the left of the connector like in your diagram, and the M8 is upright in my picture of the connector
3. if you zoom in, you can see there is not even a pin in that terminal on mine.
4. when you look at all the wires at that connector, there is a blue/white wire, BUT that is a darker shade blue than all the other blue/white wires in the circuit (ex, the wire running down along the frame to the rear reverse lights - which based on the diagram, should be the same wire)

I checked again, no codes in the BCM, only tire pressure codes. I looked through the functions on my modis edge and didnt see anything pertaining to resetting the reverse light circuit.

 

so an update. I finally figured this out. a real long story short, I wont go into all the details, but eventually ended up replacing the entire blue/white wire from under the fuse box all the way back to the reverse lights, and that did it. I had already replaced most of it, but was still having an issue with weird symptoms. I figured this out by removing/lifting the fuse box out of its place, locating both blue/white wires that come into the bottom of it, and cutting both of them. then found that one wire had power coming into it when in reverse, so figured from there back was all good. put power to the other blue white wire and was still having my issues/no lights. so just went ahead and replaced that whole wire, put it back together and now all is working.

by cutting the wires, I was also able to answer my question about the BCM connector that I asked above. in my picture, i guess i am holding it upside down. i flipped the connector over, and reverse wire IS the one located in pin 13. HOWEVER, the color DID CHANGE from a blue/white to a DarkBlue/white. so that is weird. and hopefully good info for clarity for anybody else who is also confused in the future. but, its all working now, phew!!