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Discussion Starter #1 (Edited)
Regarding the potential for a fully-functioning LED headlight retrofit into Premium and Sport models, does anyone have access to wiring diagrams for halogen and LED headlights in the 2017-18 Impreza or 2018 Crosstrek?

I have a 2018 Crosstrek with LEDs as a loaner for a few days (LOVE the SRH and High-Beam Assist), but I don't have my car to compare it to, so I'm just trying to take as many pictures of the wiring as possible. I've also read a little about the ECU and BIU - I don't know for certain yet which (or possibly both) controls the headlight functions, nor do I know if reprogramming for the previously mentioned functions (SRH, Auto-Leveling, and High-Beam Assist) is possible, but I do know that there are some overseas Subaru specialists who can reprogram/upgrade said units, so I'd imagine there'd have to be at least a few shops stateside with the capability.

Anyone with any information, potential resources, or even a general direction could be helpful. Post here or send me a PM.
One way or another, I WILL FIGURE THIS OUT.

Thanks in advance!

P.S.
I haven't done as much exploring on this, but I'd also be interested in reprogramming or rewiring the LED running lights to either stay on when the headlights are switched on, or function as switchable fog lamps, so any information regarding the wiring of those (specifically why the switch off when the headlights come on) would also be helpful. Thanks again!
 

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If you can crack this nut I will be forever grateful. The only info I can give you is there are 2 leveling sensors. One in the cabin and another at the rear. Here are the parts:

https://parts.milfordsubaru.com/a/Subaru_2017_Impreza-Limited-Wagon-20L-CVT-4WD/_52016_6959098/ELECTRICAL-PARTS-BODY-HEAD-LAMP-LEVELER-SENSOR/G14-835-04.html
https://parts.milfordsubaru.com/a/Subaru_2017_Impreza-Limited-Wagon-20L-CVT-4WD/_52016_6959155/HEAD-LAMP-HEAD-LAMP-LEVELER-UNIT/G14-840-03.html

This indicates that the wiring harness changes aren't just limited to the headlight assemblies to ECU - it goes into the cabin and through the body.

Honestly, I'd even be ok with a jerry-rigged solution without the auto-leveling as long as there is manual adjustment capability - just looking for someone else to take that plunge :).
 

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Discussion Starter #3
If you can crack this nut I will be forever grateful. The only info I can give you is there are 2 leveling sensors. One in the cabin and another at the rear. Here are the parts:



https://parts.milfordsubaru.com/a/Subaru_2017_Impreza-Limited-Wagon-20L-CVT-4WD/_52016_6959098/ELECTRICAL-PARTS-BODY-HEAD-LAMP-LEVELER-SENSOR/G14-835-04.html

https://parts.milfordsubaru.com/a/Subaru_2017_Impreza-Limited-Wagon-20L-CVT-4WD/_52016_6959155/HEAD-LAMP-HEAD-LAMP-LEVELER-UNIT/G14-840-03.html



This indicates that the wiring harness changes aren't just limited to the headlight assemblies to ECU - it goes into the cabin and through the body.



Honestly, I'd even be ok with a jerry-rigged solution without the auto-leveling as long as there is manual adjustment capability - just looking for someone else to take that plunge :).


Yeah, I was aware of those, and I’ve seen a few photos of removed headlights that appear to have provisions for manual adjustment, and though it’s unlikely as long they’re disconnected, I can’t guarantee that SRH and AL motors wouldn’t cause issues with keeping those manual adjustments.

Additionally, I’d like to imagine that high-beam function would be as simple as identifying respective wires on the harness, tapping the individual positives, and creating a common ground... your existing high-beam switch would then just operate the cutoff flap rather than an individual bulb.

The running lights may be a bit more complicated if you want them to work in conjunction with the lower running lights (on a Sport), specifically because the lowers go off when the headlights come on, but you could technically run jumpers (for either or both) to anything nearby that powers on with the ignition switch, or run them to an interior relay to operate them like fog lights.

After that, it would just be turn signal and parking light wire matchup.

I think, if all assumptions above are correct, you could get away with 2 LED headlights and two LED headlight/harness connector repair kits (the harness side of the gray plug) for a pretty clean limited install.
 

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Yeah, I was aware of those, and I’ve seen a few photos of removed headlights that appear to have provisions for manual adjustment, and though it’s unlikely as long they’re disconnected, I can’t guarantee that SRH and AL motors wouldn’t cause issues with keeping those manual adjustments.

Additionally, I’d like to imagine that high-beam function would be as simple as identifying respective wires on the harness, tapping the individual positives, and creating a common ground... your existing high-beam switch would then just operate the cutoff flap rather than an individual bulb.

The running lights may be a bit more complicated if you want them to work in conjunction with the lower running lights (on a Sport), specifically because the lowers go off when the headlights come on, but you could technically run jumpers (for either or both) to anything nearby that powers on with the ignition switch, or run them to an interior relay to operate them like fog lights.

After that, it would just be turn signal and parking light wire matchup.

I think, if all assumptions above are correct, you could get away with 2 LED headlights and two LED headlight/harness connector repair kits (the harness side of the gray plug) for a pretty clean limited install.
It is my understanding that the Sport has a different harness for the LED DRLs then the Premium with the fog lights, so there is some complication there when it comes to how to get that to work since the total wiring harness is different for the Sport than it is the Premium. I also do not think that it will be as simple as an ECU/BIU flash for the high beam assist because, I would assume, that there would have to be some sort of sensor to detect the oncoming lights. When I got my '17 the high beam assist was not an option on the Premium or Sport, it was ONLY an available option on the Limited...so to me that says that there is something special with the vehicle for that to happen. Like Vlad, I would settle with jumpers or a custom wiring (sound better then jerry-rigging) in order to get some of these functions, but I have a fear that it is more then that. If you see other posts that I have made in regards to lighting, these vehicles do not even have a flasher relay...the BCM/BIU control the turn signals.
It is also my understanding, although I have seen others that contradict this, that this generation of headlight assemblies are extremely difficult to separate...that even the oven method does not work well due to a change of adhesive. Personally I would LOVE an HID retrofit with mine. Since the low beams stay on with the high beams I think the bi-xenon would be the only choice for us short of doing both the high and lows as HID. I also wouldn't mind the addition of C-lights and have them function as my DRLs.

*I know that about 5 or so months ago I reached out to SubiSpeed about a fog as DRL harness, and at the time they said that they did not have anything like that. I also reached out to Diode Dynamics about the C-lights and at that time I was told that they did not have one for the '17s because the light channel was not the same and they did not have a '17 to work on to make it. I did offer mine as a test subject, lol, but they declined.
**My car before this was a Ford Escape. There was couple great forums like this one for the Escape. There was a post there where someone had figured out how to "override" the fog lights turning off with the high beams on. I will have to go searching for this post, will be hard it is probably every bit of 10 years old now. HOWEVER, if I remember it was a wire splice with a relay...so at least at one point it WAS possible. The only thing that I have found for it so far in for the 2010s where they were talking about something called Focccus...which I guess when combined with a laptop and an OBDII interface adapter allows you to get into the (at least the Fords) modules
 

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Hey, I put the Limited Headlights into my base Impreza without any issues. Everything works without any issues turn signals, C-lights, Hazards, high beams, normal beams. All I did is I bought a pair of led's off Ebay and worked with the wiring on the headlights. There will be extra wires on the headlights and SRH won't work. Feel free to ask questions. [PS: I put on sport rims and fog lights]
 

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Discussion Starter #6
Excellent work and photos!

Part numbers for the plugs and repair wires?
Any chance you’re planning a diy write-up? Or maybe even just schematic of how your connected everything?

Well done regardless.
 

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Hey, I put the Limited Headlights into my base Impreza without any issues. Everything works without any issues turn signals, C-lights, Hazards, high beams, normal beams. All I did is I bought a pair of led's off Ebay and worked with the wiring on the headlights. There will be extra wires on the headlights and SRH won't work. Feel free to ask questions. [PS: I put on sport rims and fog lights]
This is great! I am actually looking to add Rally lights to my 2018 Crosstrek Limited and came across your post. I am looking for a wiring diagram for these lights. Do you have one? Which of those wires is the high beam on wire? Any help you can provide would be great! Thanks in advance.
 

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Hey, I put the Limited Headlights into my base Impreza without any issues. Everything works without any issues turn signals, C-lights, Hazards, high beams, normal beams. All I did is I bought a pair of led's off Ebay and worked with the wiring on the headlights. There will be extra wires on the headlights and SRH won't work. Feel free to ask questions. [PS: I put on sport rims and fog lights]

Sure wish we heard more about this ^
 

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Hey, I put the Limited Headlights into my base Impreza without any issues. Everything works without any issues turn signals, C-lights, Hazards, high beams, normal beams. All I did is I bought a pair of led's off Ebay and worked with the wiring on the headlights. There will be extra wires on the headlights and SRH won't work. Feel free to ask questions. [PS: I put on sport rims and fog lights]

Just bought the headlights as well of eBay is there anything else you can show how you did this.. also stumped on the names of those metal clips you used please help!!!
 

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Hey, I put the Limited Headlights into my base Impreza without any issues. Everything works without any issues turn signals, C-lights, Hazards, high beams, normal beams. All I did is I bought a pair of led's off Ebay and worked with the wiring on the headlights. There will be extra wires on the headlights and SRH won't work. Feel free to ask questions. [PS: I put on sport rims and fog lights]
Hey! I love that you were able to do this. Do you happen to have instructions so i can as well?
 

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Revive! I bought an LED headlight specifically for this retrofit. @djoni69070 do you remember which wire color does what? Any sort of pinout diagram would be much appreciated please. I'll post any updates to this thread I make.
 
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