mjoneil
Well-Known Member
- Thread starter
- #1
Thanks to a thread started by JTRUBI and with the help of others like flipmode, (message me to add your name bc there were so many, I lost track), we were able to put all the pieces to the puzzle together and get the rear fog lights wired and working like EU models. These rear fogs will replace your lame reflectors 
OEM fog button will work as follows
1st click: Front fogs on
2nd click: Front and Rear fogs on
3rd click: Front fogs only again
4th click: all off
Rear fogs are indicated by orange rear facing light symbol.
Parts:
1. Rear Bumper wiring harness - 68349976AC - $29 (license plate harness but it works for fogs)
2. Rear fog left - 68338391AA - $33
3. Rear fog right - 68338390AA - $33
4. 2.8mm female pin for BCM: 10757690-L - $2
5. 1.2mm female pin for BCM: 1452668-3 -$2
6. 18awg wire – enough to route under the jeep
7. JSCAN
8. zip ties
These 2 are optional. I like to do as much OEM as possible, so I pinned them into the existing body harness. You can also order any 2pin waterproof quick disconnect from AutoZone or similar store or just wire them from the rear fog all the way to the BCM.
- 1.2mm Pins for body harness: 2177610-3 - $2
- 1.2mm cable seals: 964972-1 - $2
Prep Work:
The way the harness comes will not work as easy as plug and play. This is because each rear fog uses its own source in the BCM. The harness as ordered is designed for license plate lights which both use the same 1 source.
The end goal here is to make sure each fog plug has pin2 grounded and pin1 needs to have it’s own wire
Example:
You will get the harness like so
Goal: is to make sure each plug has an individual pin1 wire with pin2 being grounded
If going the OEM wiring route, this diagram is of how it should be wired to the existing harness. Wires outlined in red are already there from existing oem body harness to license plate lights and ground. If you don't want to wire into this harness, you don't need to but the blue and pink wire need to go all the way to the BCM regardless.
Step1:
Remove rear reflectors and put in rear fogs. Each reflector/fog has three 7mm bolts. You can get to all 3 with the bumper still on.. the bottom 2 are easy but the top 1 may require a 1/4 ratchet with a longer 7mm socket.
Step2:
Plug in the rear fogs
Pin in the new harness you got to the existing body harness attached to the frame or if you purchased a quick disconnect, wire that up.
For those going the OEM route, currently its wired as so:
pin1: LICENSE PLATE LAMP DRIVER
pin2: empty
pin3: empty
pin4: GROUND
With the new rear harness, once pinned into the BCM, it will act as the following:
pin1: LICENSE PLATE LAMP DRIVER
pin2: FOG RR LAMP FEED 2
pin3: REAR FOG LAMP FEED
pin4: GROUND
Again, these were the optional parts mentioned above(1.2mm pins) to wire into body harness
Step3:
(much easier if you drop spare tire) and wire all the way up to, and through the passenger’s firewall. Google "adding AUX kit to JL/JT" and you will get plenty of hits on how to wire through the firewall.
Step4:
The fun part, working with the BCM. Disconnect battery before working on this just in case.
The goal here is to wire the 2 fogs into the BCM.
Again, you can google adding in the "AUX kit" or "adding Mopar LED headlights" Both of those videos will show you how to work with the BCM plugs far better then I can explain in writing.
1 of the wires need to go to BCM C6/F pin 5 (this pin is 1.2mm)
the other wire needs to go BCM C5/E pin 39 (this pin is 2.8mm)
it doesn't matter which one is wired to which.
C5/E pin 39 is 2.8mm
C6/F - Pin 5 is a 1.2mm
Step5:
Use JSCAN to program rear fogs and you're done
Other pics for reference
BCM UPDATE:
EDIT: I lied when I said watching a video on the BCM would be better... I forgot I had bought a used BCM to play around with.. so here you go!
Note: this is literally the harness for BCM C5/E in the pictures, it will be exactly like this for you.
step 1:
In this picture, this harness will be connected to the BCM. To remove, press in the button circled in red while at the same time pushing up on the gray handle. This will release it from the BCM.
Once released, the harness will be free and will look like this.
Step 2:
Stick a small flathead screwdriver in this little clip to release the inner wiring harness
Top view of where flathead needs to go
Step 3:
While the flathead screwdriver is in, pull out the inner harness. I did this by gently pulling on the wires to get it started. Don't worry, the wires are not gonna come out by you pulling.
Step 4:
plug your new wire in the empty hole. Refer to diagrams above on where to place wires. On the large black harness, the pins are also labeled if you have good eye sight. You will hear an audible click when seating the wire/pin in. Give it a gentle tug to make sure it will not come out.
Step 5:
Put the smaller harness back into the large one. Pretty straight forward and a note, the red circled grooves are what lock the pins in even more so if your pin isn't fully seated, it's not making it past those grooves.
and just like that you are a master at working with the BCM
OEM fog button will work as follows
1st click: Front fogs on
2nd click: Front and Rear fogs on
3rd click: Front fogs only again
4th click: all off
Rear fogs are indicated by orange rear facing light symbol.
Parts:
1. Rear Bumper wiring harness - 68349976AC - $29 (license plate harness but it works for fogs)
2. Rear fog left - 68338391AA - $33
3. Rear fog right - 68338390AA - $33
4. 2.8mm female pin for BCM: 10757690-L - $2
5. 1.2mm female pin for BCM: 1452668-3 -$2
6. 18awg wire – enough to route under the jeep
7. JSCAN
8. zip ties
These 2 are optional. I like to do as much OEM as possible, so I pinned them into the existing body harness. You can also order any 2pin waterproof quick disconnect from AutoZone or similar store or just wire them from the rear fog all the way to the BCM.
- 1.2mm Pins for body harness: 2177610-3 - $2
- 1.2mm cable seals: 964972-1 - $2
Prep Work:
The way the harness comes will not work as easy as plug and play. This is because each rear fog uses its own source in the BCM. The harness as ordered is designed for license plate lights which both use the same 1 source.
The end goal here is to make sure each fog plug has pin2 grounded and pin1 needs to have it’s own wire
Example:
You will get the harness like so
Goal: is to make sure each plug has an individual pin1 wire with pin2 being grounded
If going the OEM wiring route, this diagram is of how it should be wired to the existing harness. Wires outlined in red are already there from existing oem body harness to license plate lights and ground. If you don't want to wire into this harness, you don't need to but the blue and pink wire need to go all the way to the BCM regardless.
Step1:
Remove rear reflectors and put in rear fogs. Each reflector/fog has three 7mm bolts. You can get to all 3 with the bumper still on.. the bottom 2 are easy but the top 1 may require a 1/4 ratchet with a longer 7mm socket.
Step2:
Plug in the rear fogs
Pin in the new harness you got to the existing body harness attached to the frame or if you purchased a quick disconnect, wire that up.
For those going the OEM route, currently its wired as so:
pin1: LICENSE PLATE LAMP DRIVER
pin2: empty
pin3: empty
pin4: GROUND
With the new rear harness, once pinned into the BCM, it will act as the following:
pin1: LICENSE PLATE LAMP DRIVER
pin2: FOG RR LAMP FEED 2
pin3: REAR FOG LAMP FEED
pin4: GROUND
Again, these were the optional parts mentioned above(1.2mm pins) to wire into body harness
Step3:
(much easier if you drop spare tire) and wire all the way up to, and through the passenger’s firewall. Google "adding AUX kit to JL/JT" and you will get plenty of hits on how to wire through the firewall.
Step4:
The fun part, working with the BCM. Disconnect battery before working on this just in case.
The goal here is to wire the 2 fogs into the BCM.
Again, you can google adding in the "AUX kit" or "adding Mopar LED headlights" Both of those videos will show you how to work with the BCM plugs far better then I can explain in writing.
1 of the wires need to go to BCM C6/F pin 5 (this pin is 1.2mm)
the other wire needs to go BCM C5/E pin 39 (this pin is 2.8mm)
it doesn't matter which one is wired to which.
C5/E pin 39 is 2.8mm
C6/F - Pin 5 is a 1.2mm
Step5:
Use JSCAN to program rear fogs and you're done
Other pics for reference
BCM UPDATE:
EDIT: I lied when I said watching a video on the BCM would be better... I forgot I had bought a used BCM to play around with.. so here you go!
Note: this is literally the harness for BCM C5/E in the pictures, it will be exactly like this for you.
step 1:
In this picture, this harness will be connected to the BCM. To remove, press in the button circled in red while at the same time pushing up on the gray handle. This will release it from the BCM.
Once released, the harness will be free and will look like this.
Step 2:
Stick a small flathead screwdriver in this little clip to release the inner wiring harness
Top view of where flathead needs to go
Step 3:
While the flathead screwdriver is in, pull out the inner harness. I did this by gently pulling on the wires to get it started. Don't worry, the wires are not gonna come out by you pulling.
Step 4:
plug your new wire in the empty hole. Refer to diagrams above on where to place wires. On the large black harness, the pins are also labeled if you have good eye sight. You will hear an audible click when seating the wire/pin in. Give it a gentle tug to make sure it will not come out.
Step 5:
Put the smaller harness back into the large one. Pretty straight forward and a note, the red circled grooves are what lock the pins in even more so if your pin isn't fully seated, it's not making it past those grooves.
and just like that you are a master at working with the BCM
Sponsored
Last edited:
