.

I'm not 100% on when you want this light on, I'd assume while the other reverse lights are on. If that's the case this eTrailer part may able to solve your issue:

https://www.etrailer.com/Trailer-Wiring/Ford/Focus/2017/118674.html?vehicleid=201738034

It typically plugs in in-line with the stock tail light assemblies to provide 12v out for running/turn/brake, but for your case you could instead piggyback along the reverse wire of a taillight and the box will give you a clean 12v output to power your light.

Adding a simple SPST relay and a switch could give you further ability to turn it on anytime as well.


If you're looking to have it come on with the foglights, that would be something I have no idea on. I don't know a lot about this rear light you are adding and when it's supposed to be on, but the above was my best guess.

 

It’s actually a red light although the housing is clear. Meant to be used in bad weather/low visibility as a rear foglight. If I can make it work through the bcm it is controlled through the headlight switch (need the euro switch) and can be turned on when at least the running lights are on based on my tests so far.

Thanks for the link to the T-harness this would work too if wiring to the bcm does not work. The T-harness would make it extra easy for anyone wanting to run this as a fourth brake light which I dont intend to do though.

I was planning to run it to a switched power source at the rear fuse box using add-a-fuse and a dedicated switch if it doesnt work. I already feed the wires through the passenger taillight feedthru and all I need now is the power source (bcm or other).

Thanks!

 

I’m at the dealer getting the driver seat backrest cushion replaced (damaged by failed lower back support mechanism) and the tech looked at the wiring in his computer for the rear fog while the heated pad adhesive cured. Found the same pin #10 I already tried for the rear fog. He suggested calling another dealer who has more experience with programming to the bcm and adding features such as this (they are a ford performance authorized dealer too and supposedly get all sorts of similar requests).

I have the day off so I’ll see what I can do today and give them a call next week if I cant figure it out with the info provided herein.

If they cant figure it out either I’ll run a dedicated switch and be done with it + provide all the info I can in the initial post for future reference if that can help anyone some day.

 

Pulled the pins out of C2280B at pins 1, 9, 12 & 13 this afternoon which all had the rear fog mention in the wiring diagrams. None of them are switched with the rear fog button. Those seemed to be the rear position lights (the strip at the bottom of our tailights) and the rear brake lights.

Will check pins 19&20 of connector C2280E later today but I have the feeling those will be the backup lights...

Edit: checked pins 19/20 at connectors C2280E and those are for the backup lights. @ControlNode @phillofoc any other reference to rear fog anywhere else in the manuals? As suggested it seems every reference to any lights located in the tails are labeled as rear fog...

I guess next step is requesting an extended license in Forscan and having a look in there. My current license has expired since last time I used Forscan, will modify the TPMS treshold while I’m in there too.

Wire 10 from connector C2280B was what my dealer tech came up with too, could be a manner of programming the bcm to activate the rear fog, I still have the added pin 10 wire in the connector so this will be easy to check after makinh changes in Forscan.

 

Used Forscan today to change the TPMS treshold and looked for any way to enable the rear fog.

Line 726-28-01 referenced in other platforms (fusion, mustang) was nowhere to be found and all the options with the slightest reference to the rear fog were locked (engineering mode required).

I might keep searching but for now I started wiring the light to a switch using an add-a-fuse at the rear fusebox. Routing the wires to the front was really easy just needed to pull the door surround seals, front dash side panel and trunk side trim to make a clean routing.

Will mount the switch on the steering column upper panel, the one which is two pieces with a vinyl piece in between. Got a spare part for 6$ at the scrapyard if I switch back to another setup for the switch someday, or if someone figures out the wiring to the bcm. Still need to finish the switch wiring tomorrow and find a fuse which is switched with ignition (probably the passenger heated seat fuse (35), was first using the rear passenger side door module fuse (7) but found out this one is not switched)!

Will clean up the first post with all the info I have when I’m done.

 

Still need to finish the switch wiring tomorrow and find a fuse which is switched with ignition (probably the passenger heated seat fuse (35), was first using the rear passenger side door module fuse (7) but found out this one is not switched)!

Use F87, the heated steering wheel.

 

I guess I nee to visit my dealer one of these days.

I tested driving at low speed and it does open.

I guess till the doors does not lock when i motion it'll still open.

 

Good info, I never tried it, i guess I’ll try when I put the stock light switch back in!

Rear fog is all wired, pretty pleased with the end result, the switch is pretty stealth and only projects a little bit of blue light on the cluster surround piece when turned on to indicate the rear fog is on (cant see the switch from the driver’s seat where it is located). The rear fog light is quite bright and projects a nice beam of light. It will function perfectly in bad weather and reduced visibility conditions and as intended.

Will update the first post with all the info and pictures I have when I’m on my computer.

Also changed the bulb in the glovebox while putting it back in. I didnt even know there was a light in there until I took it apart and noticed it was burned. Used some LED so it hopefully lasts forever now! Although a traditional bulb would emit more side light and in this case it’s probably what you want since the housing has the opening on the side of the bulb to light up the glovebox. It is bright enough to compensate though!

 

Sorry for the late entry...

Did you change rear foglight function BCM setting from 03 to 02

and rear foglight tow function from 01 to 02
(not sure if the tow setting like this is essential, but it's set on all cars I've seen with my ASbuilt database) These are surely the correct EU BCM settings.

Did you retest your added pin 10 after this bcm change and full car system restart? That rear fog button on the euro switch should now have the ability to toggle the power?

To Recap what I also confirmed elsewhere,
ControlNode was very likely correct with:

[BCM]>C2280B-10>----CLS45(RD-BK)---->C431-9>----CLS45(RD-BK)----<C699-1<[FOG LAMP, CENTER REAR]>C699-2>----GD150(BK-WH)----<C431-10<----GD150(BK-WH)----(S402)----G401.

The rear connector 431 is missing wire CLS45(RD-BK) & (BK-WH to GD150 near rear fuses), CLS45 would lead from (correct part number for EU rear bumper harness, ty Terry = G1ET-15K868-RAD) through C431 to BCM2280(B) , our incorrect harness (usdm harness) is missing wires like stated above. That being said, it was pin 10 and likely wired correctly...and if you didn't change the setting in Forscan...that's 100% very likely all the issue ever was with it not switching power...but if you did...well it's still wiring and I'll get that worked out within the weekend.

 

Sorry for the late entry

Did you change rear foglight function BCM setting from 03 to 02

and rear foglight tow function from 01 to 02
(not sure if the tow setting like this is essential, but its set on all cars I've seen with my ASbuilt database) These are surely the correct EU BCM settings.

.

No worries!! Thanks for jumping in to help! I did not change the settings above as I did not know how to access the engineering mode (could not change setting actually).

Can you let me know how to access the engineering mode? I’ll give it a try over the week-end and go back to the bcm to check if pin 10 power is switched with the press of the rear fog button (left the added pin in there for further trials).

If this gets the pin 10 power switching I’d be happy to simply have to run a wire to the back! I have it wired to a switch for now (powered by rear fuse box add-a-fuse) which works perfectly in the meantime.

Thanks!

 

You can select the mode

here.

Otherwise it's as simple as:

Click the line with the option you want 02 in this case.
Click the check.
Click write.

Your reply has me excited!!! I bet this fixes it. I'm so confident, that I already ordered a switch!!!

 

Did you try just selecting it, hitting the checkmark, then just write the changes with the button below?

Was going to edit my previous post I found it in a minute by a simple google search which lead me to a Forscan article!

I honestly didnt search that day and assumed I did not have access to this function!

I’ll try this over the week-end if I have some time to spend in the garage!

 

According to diagrams the only other thing to check wiring wise is pin 5 gn/vt in the plug C205 is present as that connects to the BCM plug C2280C (60 pins) to pin 4 (Light Switch LIN BUS), which is very likely seeing as the IPC wouldn't illuminate if it wasn't at least getting the signals over that pin 4 lin bus wire, I will look for more things to try to change in the BCM and will work on it when I get the switch next week. The BCM itself is a different part number for EU cars also, this is something to investigate; so maybe it isn't pin 10 maybe it's another one.

 

check pin 5 gn/vt in the plug C205 is present as that connects to the BCM plug C2280C (60 pins) to pin 4 (Light Switch LIN BUS)

Will verify that thanks.

Is C205 the light switch connector?

This would be similar to what they do on the fusions to enable the rear fog. They need to run a wire from the switch connector to the bcm for their switch to work.

 

c205 is the light switch connector

 

Just got back home and checked connector C205. The light switch connector C205 has three wires:
- Pin 1 red wire
- Pin 5 green/violet wire
- Pin 7 black wire

It’s probably safe to assume the green/violet wire is routed to bcm connector C2280C pin 4 since the rear fog annunciator in the dash is working. Wouldn't this mean the bcm is receiving the command to turn the rear fog on properly?

If the euro rs have a different bcm I hope ours is still compatible with this function. I hope you figure it out when you get your euro switch! I dont really mind the dedicated switch I added but I would prefer making use of the OE switch and use the dash annunciator when turned on.

 

Any DTCs in forscan from making that change? (rear foglight missing) Are you 100% sure it took the changes to the BCM? (went back into the BCM with forscan and it was changed)

If so, With everything that's known, here's the possibilities I came up. **The BCM is supposed to stay hot, the hatch circuit stays hot until the switch pulls it to ground, so PIN 10 being that way means either:

A. BCM (possible) still needs some changes to turn off trunk switch bcm relay as somehow that buttons address is bug and/or enable the pin 10 fog switch BCM relay, @Barroux

B. BCM (possible) itself isn't compatible and doesn't have the relay at pin 10 or yours is defective. ---They look and seem similar enough, but I'll ask someone with more parts knowledge since H and J are major revisions.

1.GV6T-14A073-H(B or above) = EU/UK module
2.GV6T-14A073-J(C or above) = US

C. Fuses (unlikely)

You can see there is 1 15 AMP fuse that is different... which is F68 15A Electric steering column lock...

D.Wrong Switch
Sends some, but not all of the correct info back across the LIN, the tag to actually switch the relay is wrong, but the part tagged to switch the ipc is correct.

 

That’s weird my post from yesterday evening disappeared! And so did some other posts I saw in other threads yesterday!

Anyhow I checked the light switch connector and it has three wires including the green/violet wire at pin 5 (if I remember correctly they are as follows):
- Pin 1: red wire
- Pin 5: green/violet wire
- Pin 7: black wire

@jefferysanders there were no DTC in Forscan after making the change.

I hope you can figure it out when you receive your euro switch. The fact our bcm is different might not be such good news though! Or maybe we just need another small change to be made somewhere in Forscan. The fact that the rear fog annunciator works with the switch is still making me hope someone figures it out at some point.

Thanks again for your help!

 

Is this the wire that you're talking about?

If the OEM switch puts out any power to the BCM or instrument panel, even to light up the LED in the instrument panel, you can run a solid state relay to switch the rear fogs bypassing the BCM all together. @Barroux if you still want to use the OEM switch, this may be a thing but now you have a hole in your steering column.

https://www.ebay.com/itm/Kyotto-KF0...D-Relay-Solid-State-32-Volt-DC-Input-2-Amp-60-Volt-DC-Output-4-Pin/111018938454

or

https://www.amazon.com/Kyoto-Electric-KF0602D-Solid-State/dp/B00B888WVC

This may be the solution that we were all looking for. If you do this, you don't have to mess with fighting the BCM. Sorry but I just found this as a thing.

I was expecting to have to run a power line anyway as carmakers often have a USDM wiring loom that's different than the Euro ones. The KF0604D lets you run 4A if that's a thing for you. Input current is 15mA, which shouldn't throw any codes if ran in parallel with other LEDs (it's a LED with photodetector that turns on the relay).

 

Is this the wire that you're talking about?


If the OEM switch puts out any power to the BCM or instrument panel, even to light up the LED in the instrument panel, you can run a solid state relay to switch the rear fogs bypassing the BCM all together. @Barroux if you still want to use the OEM switch, this may be a thing but now you have a hole in your steering column.

Cool thanks will have to look at this later today!

No worries for the hole in the plastic cover I already planned this to be temporary until someone finds a solution to use the euro switch! I bought a spare at the local yard for 3$ + 3$ access fee (you have to pull the part yourself)!

I’ll have to watch it with sound on to know what this guy did, did not want to disturb anyone where I was at when I saw this!

This looks promising!

 

@phillofoc

I was too excited about this so I took some time to check it now! Is it just me or this guy does not provide info on where the wire was added?

He just wrote in the comments he had to add it but without further details...

There’s only 5 pins to test so maybe I’ll just add a wire to all 5 pins and test them later when I have some time! This would be too good to be true!!

 

ya idk the forums are buggin...

 

Hoonigan notified everyone about that so it’s not just me!
@phillofoc I rushed back to the garage to try the light switch connector thing. The switch only has 6 pins so I added wires at the remaining three pins (same pins type as the ones for bcm C2280B). None of them provided a switched power source with the rear fog buttons. I thought maybe there was more switches configurations but all the ones I checked on ebay uk have 6 pins too.

I created an account in youtube and asked the guy for more details. In his case he found the switched power source but did not have the annunciator working in the dash... In the meantime I took the switch apart to see how it’s made and searched some fusion/mondeo switches to see if they are different.

The fusion switches have more pins coming out of them although their buttons layout is identical. Maybe that’s how he got his switched power source by adding a wire to the proper pin. This would also match with what the guy did in the fusion forum I posted a while back.

If that’s the case then I guess we wont be able to achieve the same result with our focus switches, or maybe the fusion switch could be used if figuring out where to move our 3 wires/pins to the fusion connector, and then use the output for our rear fog.

See attachments for the fusion vs focus connector size/pins count. And for our switch internal and circuit board.

 

Which pn., HW: xx ,SW: xx of the euro do you have?

 

SW:04 HW:07

Attached is a picture of the switch label.

 

Darn. Back to the drawing board I suppose. Not that it helps, but the wiring diagram for the focus shows 8 pins for the light switch. All the switching seems to be on the CAN bus to at least the BCM, which makes things more difficult for us. A quick ebay search showed a 14-pin connector for the Mondeos, so not something that we could adapt for our purposes. Well, I'm the proud owner of one of those fancy relays now as I ordered it thinking we were on the right track.

 

I see a trend in this thread...of people getting excited and buying parts too fast!!

By the time this will be over I’ll have quite a bit of extra parts myself (1 fog light, bcm connectors and a steering colum cover set from a scrapped car, maybe a useless euro light switch, some other switched I bought before I used the nice amazon one, etc)!

But that’s all fun and keeping me busy when I have time to spare so why not! Keep getting excited guys and posting what you find everyone’s input has been very helpful so far! Some day someone will figure it out!

 

That switch should be fine as far as I could tell looking on the eu parts catalog (I also asked the uk expert and he gets back pretty fast and is spot on, really nice guy)

I ordered sub-revision B, but it's the same HW and SW. I just hope it's not the BCM itself, that would make it a ****ing ***** considering it interfaces with PATS from what I know.

I'm really leaning toward another BCM change though, forscan sometimes being insufficient it might be ucds time. I'm still comparing as-built BCM data, there are quite a few differences and finding single bit changes with no references to the addresses is really a drag and a toss up without sitting in the car and doing each change, restarting the car, seeing the effect, noting it, and then either reverting or moving to the next; its going to be a glorious Neil Armstrong moment, for sure if we get this working lol....just hoping it doesn't end like Apollo 1.

 

Its still deleting messages, but good news is that the switch is confirmed to be correct, and the BCM is diffrent PN, but I've seen no less than 4 different compatible PNs, so I am leaning toward a sw issue with forscan and it not actually making the change, its been reported that it even looks like it changed, but doesn't ( EU steering wheel cruise control issues.) If I get the same results I'll get UCDS and try with that as I want to update modules and other things ucds has over forscan. Forscan is limited in that respect as well as plenty others...mostly just being overly complicated codes vs simple english.

 

I cant wait to see if you find out how to do it when you get your switch and start digging into it. I reached the limits of my bcm and forscan knowledge but you seem to have more ressources/skills to take it further!

I actually used the light for the first time today, we had bad freezing rain/snow pushed by strong wind gusts on a strech of highway, could barely see the lights from the cars ahead. I figured it was time to use it after all the work involves in installing it!

 

.

Good to know that companies are working on this too, a good selection of outputs available

 

.

Good to know that companies are working on this too, a good selection of outputs available

That's interesting! I guess someone with more knowledge of CanBus could intercept the signal for the rear fog and use it to trigger a relay somehow...definitely not something I know anything about but still very interesting!

 

Little update, hella rear fog light was delivered yesterday in my community mailbox, will compare with the luxvision later this week or this week-end and decide which one I'll be keeping. Already have someone interested in buying the one I wont be using, if that does not happen I'll be posting one in the classifieds, or keeping it in my spares parts bin!

As a reminder I bought it from this site:
https://www.rallylights.com/hella-55mm-led-turn-reverse-or-rear-fog-lamp.html

It was a special order item, originally supposed to take 6 weeks for delivery, ended up taking 10 weeks! Glad I bought the LuxVision too so I could keep this project moving waiting for the Hella!

Need to update this first post with all I can too. Until someone figures out how to wire to the bcm I'll be done with it once I decide which light I'm using and swap the hella in there if I decide to use it.

Thanks everyone who contributed to this thread for your help, it was much appreciated!

 

Picked up the Hella light after hockey. It feels maybe a bit more quality than the luxvision buy that’s mainly due to the back housing which is made of aluminum. The Luxvision is all plastic with an aluminum heat sink stuck on it at the back. The Hella comes in a real box with instructions (good for amp sizing only since it’s otherwise straight forward...they say 3A fuse is needed for the light). The Luxvision came in an enveloppe with no real packaging.

Both lights seem identical in shape and mounting flanges, will confirm when I fit it but they seem near identical.

Otherwise the Hella is maybe a bit brighter but it’s hard to tell really! Since it has multiple LEDs it feels brighter and lights up the whole lense too. The light is quite bright and hard to look at directly which is perfect for what it is used for. The Hella lense has bumps on it aligned with each LED and the face of the lense is not clear, more like frosted.

The Luxvision uses only one LED but that one LED is at the bottom of a pretty big reflector which does a great job at projecting a concentrated beam of light. The light however is concentrated in that spot and does not fill the lense. The lense is clear and all the fake reflectors around the contour are not used on the rear fog configuration (must be for turn signal versions I guess).

I think I’ll be using the Hella since it has more LEDs (I like the redundancy) and produces a bigger spot of light by lighting the whole housing (I’ll take all the visibility I can in bad weather). Once installed if it seems equally “blinding” as the Luxvision this is the one that will stay in there!

I guess at this point it’s a matter of personal preference as both do a great job as rear fogs. Would have liked to have someone drive my car with the rear fog on to compare both...but nobody else drives it really!

 

I found this forum topic while looking for a rear fog light option for my Ford Transit Connect. The TC is built on the Focus platform so the electronics are the same or very similar. Using the info here I bought a light switch from eBay UK. I confirmed the rear fog light illuminates on the cluster and the BCM does not output a signal. I tried in vain to find a signal from the light switch I could use to turn on the fog light. The switch is only sending out LIN Bus packets, there is no physical switching of signals/power.
I focused on the power that was controlling the LED on the cluster and found the circuitry for the rear fog LED on the cluster circuit board. The LED does not turn on/off with a simple on/off voltage and the power is pulse width modulated (PWM). After a lot of testing and some circuit design, I found a circuit that will turn on a rear fog light by pressing the button on the light switch.
I built a circuit that reads the voltage on the cluster LED and turns it into a signal I can use to drive a relay. I know this is probably too complicated for most, but it is a functional solution. See the attached sketch of the circuit diagram. Half of the circuit is home-made and the other half is a relay driver that I bought on Amazon. I soldered a wire on the cluster circuit board for the LED signal and connected it to the circuit. I used power from the left rear running light to operate the circuit and the fog lamp so nothing is powered if the lights are not on (I found this circuit is limited to about 2A by the BCM). The circuit is under the dash cover behind the IPC (lots of space in the TC).
Maybe someone will design a circuit using an Arduino that will read the LIN Bus and close a relay when the fog lamp switch is pressed. This is beyond my skill set.
Thanks to all who worked on this. You did most of the hard work.

 

I found this forum topic while looking for a rear fog light option for my Ford Transit Connect. The TC is built on the Focus platform so the electronics are the same or very similar. Using the info here I bought a light switch from eBay UK. I confirmed the rear fog light illuminates on the cluster and the BCM does not output a signal. I tried in vain to find a signal from the light switch I could use to turn on the fog light. The switch is only sending out LIN Bus packets, there is no physical switching of signals/power.
I focused on the power that was controlling the LED on the cluster and found the circuitry for the rear fog LED on the cluster circuit board. The LED does not turn on/off with a simple on/off voltage and the power is pulse width modulated (PWM). After a lot of testing and some circuit design, I found a circuit that will turn on a rear fog light by pressing the button on the light switch.
I built a circuit that reads the voltage on the cluster LED and turns it into a signal I can use to drive a relay. I know this is probably too complicated for most, but it is a functional solution. See the attached sketch of the circuit diagram. Half of the circuit is home-made and the other half is a relay driver that I bought on Amazon. I soldered a wire on the cluster circuit board for the LED signal and connected it to the circuit. I used power from the left rear running light to operate the circuit and the fog lamp so nothing is powered if the lights are not on (I found this circuit is limited to about 2A by the BCM). The circuit is under the dash cover behind the IPC (lots of space in the TC).
Maybe someone will design a circuit using an Arduino that will read the LIN Bus and close a relay when the fog lamp switch is pressed. This is beyond my skill set.
Thanks to all who worked on this. You did most of the hard work.
View attachment 330082 View attachment 330084

Interesting solution for sure! I was thinking about the Arduino solution earlier today. I found a guy who did a similar project (run a relay off the headlight canbus signal) here:
TechTinker ? View topic - Control Accessories via the CAN-BUS.
and
https://www.instructables.com/id/Arduino-ControlIntegrate-Aftermarket-Accessories-v/

Doesn't look too crazy, but you'll have to sniff for the rear foglight canID

Possible, sure, but this project is going to take way more time than I have right now to put it all together

 

@DonRidley great info you posted there!

Way beyond my skill level but very interesting! Glad some of the info gathered here was helpful to you and appreciate that you registered to contribute to this thread!

Got some pictures of the light itself on the TC? Which light did you use and how did you mount it? Was that to make it legal where the rear fog is required by law or was it just for the fun of it and added safety when needed?

 

I could not find any information on where the rear TC fog lights are installed by the factory for the European markets. I installed a 7443 bulb in the lower marker light housing that originally had a 5W5 small bulb. I had to carve-out the housing to match the keys on an OEM 7443 bulb socket. It fit perfectly. The fog light switch turns on the bright element of a 7443 LED bulb. Probably not as bright as the dedicated RS fog light, but it works.