Body inegrated unit, dome dimming circuit: data for and repair of - Page 2 - Subaru Forester Owners Forum
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post #16 of 26 (permalink) Old 01-16-2012, 12:09 PM
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Hi guys,

05 Legacy GT Wagon owner here. Just wanted to say thanks to the OP - I came across this post googling "Subaru BIU repair" after I had the stereo and some other illumination die in my car. Used info in this thread to look into mine and fixed it.

Link to my post on legacygt.com if you're interested:

http://legacygt.com/forums/showthrea...on-177954.html


Thanks again.

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post #17 of 26 (permalink) Old 01-17-2012, 11:42 AM Thread Starter
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I'm happy to see you made use of the info. That was the whole reason for posting! Thanks for the reply.


2007 X Prem w/AWP, 5MT, Newport Blue, 170k
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post #18 of 26 (permalink) Old 06-23-2012, 02:10 PM
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dougr,

I could really use your input on my issue. I have 2001 Legacy GT, however I have swapped a brand new 2004 Turbo Baja bulkhead harness to do a STi swap. The issue I am having is I get no illumination when switching my lights "on". I have a video showing the issue.



I have tried two used integrated units, but not a new one. I am fairly certain I have checked all fuses and they are not blown.

Any ideas or help in diagnosing this would be great. I have been stuck on this for months.

The only wiring I have changed is I spliced in STi plugs, but i only tapped into wires, so unless two pins are grounding in the plug I don't think there would be a reason this should affect the illumination?

The stalk on my 2001 is supposedly the same as the baja, I have tried a STi stalk and an 02 legacy stalk as well, same results. I can see from the wiring the harness itself is different but my 2001 harness used an illumination control module with no integrated unit and the baja just uses an integrated unit to control so I assume the difference is handled by the BIU.

thanks for the help!

Ben
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post #19 of 26 (permalink) Old 06-30-2012, 09:13 PM Thread Starter
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Ben,

Wow, that's way more involved than my issue. It's been a while since I did this whole project and I can't actually recall exactly what my BIU handled, and I can't find the service manuals on my laptop here. They must be on an archive drive I have laying around.

I don't know if I can be of much help! Sounds like a tedious tracing job. When you say you've used a 04 Baja harness, that means you still have the 01 Legacy BIU in place, correct?

Doug

2007 X Prem w/AWP, 5MT, Newport Blue, 170k
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post #20 of 26 (permalink) Old 03-15-2013, 01:18 PM
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Body inegrated unit, dome dimming circuit: data for and repair of

sorry to revive an old thread but im having problems with mine too..after doing this fix, it work for me for a few days then the dome lights stayed on and will only turn off if on the off position it will not turn off when the door closes or when u lock the door when in door position.. before i did all these i added wheel well lights and a key ring light. i have a 06 forester x..also another question is can i just buy a used biu from ebay theres a few that are under $30 but was wondering if i can just use any from 06-08 or does it have to be the same part numbers thats on the biu? mine is a U 88281 SA130.. theres a few SA150,SA120 and the first letter is different eg. like M 88281 SA150 from an 08 XT..any help would be appreciated.thanks in advance!
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post #21 of 26 (permalink) Old 06-11-2016, 09:14 PM
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yet, reviving once again. anyone know if I can use an AT BIU on a MT? I believe the shifter interlock is located in the AT BIU (based off another thread). but I wouldn't think the MT bulkhead harness would even be wired up for it.

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- my second SG6
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post #22 of 26 (permalink) Old 06-13-2016, 08:36 PM Thread Starter
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Do the wiring diagram PDFs from Subaru give any clues? I have them but don't have access to them at the moment.

2007 X Prem w/AWP, 5MT, Newport Blue, 170k
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post #23 of 26 (permalink) Old 05-07-2017, 06:07 AM
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This is my first post on this forum so hello everybody! I'm happy to join Subaru Forester community :-)

So I finally decided to do the "map lights mod" to come on together with dome light when door is open.
I did the mod, replaced the map and dome lights with LED panels and everything else went well and worked fine until one point.

I tried to find a better mounting position for the LED panels inside thee map light bulb compartment and accidentally shortened the circuit :-(
(didn't notice that the LED panels have a metal base).

So I burned the 15Amp fuse in the engine room fuse box -fuse labeled "clock-room" (image attached).
I have replaced the fuse, but since then the dome light doesn't come on when door is open.
Dome lights do work when I manually switch the roof switch to "ON" position. They do not work in "DOOR" position.
I have also checked the yellow with red stripe wire that goes to the dome light (image attached).
Before I shortened the circuit the yellow with red stripe wire used to have a ground signal when door is open - now it doesn't.

Does it mean I burned the BIU?

Also if this is any indication, the red control light "door open" on the dash control panel works fine (image attached).

What should I do now to diagnose the problem?
Should I unmount the BIU, open it and see if there is any signs of burned trace?
I'll appreciate any suggestions, thanks.
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post #24 of 26 (permalink) Old 05-07-2017, 12:36 PM
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Quote:
Originally Posted by ross_rg View Post
This is my first post on this forum so hello everybody! I'm happy to join Subaru Forester community :-)

So I finally decided to do the "map lights mod" to come on together with dome light when door is open.
I did the mod, replaced the map and dome lights with LED panels and everything else went well and worked fine until one point.

I tried to find a better mounting position for the LED panels inside thee map light bulb compartment and accidentally shortened the circuit :-(
(didn't notice that the LED panels have a metal base).

So I burned the 15Amp fuse in the engine room fuse box -fuse labeled "clock-room" (image attached).
I have replaced the fuse, but since then the dome light doesn't come on when door is open.
Dome lights do work when I manually switch the roof switch to "ON" position. They do not work in "DOOR" position.
I have also checked the yellow with red stripe wire that goes to the dome light (image attached).
Before I shortened the circuit the yellow with red stripe wire used to have a ground signal when door is open - now it doesn't.

Does it mean I burned the BIU?

Also if this is any indication, the red control light "door open" on the dash control panel works fine (image attached).

What should I do now to diagnose the problem?
Should I unmount the BIU, open it and see if there is any signs of burned trace?
I'll appreciate any suggestions, thanks.
I have some update to my question. Don't see the edit button so I quote myself.
Just to be more specific about the car, it is a 2006 Forester XT 2.5 turbo. Didn't mention it earlier because it is in my account details but I thought it is easier for you to read it here.

So I have spent all day looking for potential cause of problem and I think I might have found it.
The plan was to find a BIU box but eventually I didn't find it (I don't know if 2006 Forester even has one), instead I found about 5 other boxes with electronics in different locations under the dash.
Opened each one and checked if there is any sign of burned PCB trace and finally... found one!
I already knew I was close even before I opened it because it smelled like burned electronics :-)
The box I'm talking about is the Keyless Control Unit (see attached photo 1 ) located on the passenger side (need to remove the glove compartment to access it).

I opened the box and easily spotted the burned trace, you can see it on the attached photos 2 & 3.

So I have soldered the burned trace and ran to the car to install the unit and see the result and... the dome light lit :-)
My happiness didn't last long because when I closed the door the light didn't go out.
I guess when I shortened the circuit except of the PCB traced some other element (like transistor or relay) also burned and now is stuck to "always ON".
The only way to turn off the dome lights is to put the switch into OFF position.

Does anyone know what is the black square element on the PCB? (marked on the photo 4)
Can I buy this element in a regular electronics shop?
The burned trace leads to this element so I assume this could be burned too, or maybe that is not all?
Any suggestions welcome :-)

I also noticed one other thing, since I soldered the bad trace and installed the unit back in the car, the green illumination ring around the ignition switch (photo 5) is also "always on"
and there is no way to turn it off, so I guess it will drain the battery in a day or two if the car is not used.
Hopefully I'll be able to fix the problem soon.

Looking forward to your suggestions!
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post #25 of 26 (permalink) Old 05-08-2017, 04:31 AM
kyo
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The black square is probably a MOSFET, as the markings on it point to an ON 3055VL. You could order it online, or maybe find a compatible replacement locally.


Snow? What snow?
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post #26 of 26 (permalink) Old 05-08-2017, 05:11 AM
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Quote:
Originally Posted by kyo View Post
The black square is probably a MOSFET, as the markings on it point to an ON 3055VL. You could order it online, or maybe find a compatible replacement locally.
thanks kyo, I'll check it at a local electronic shop
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