Welcome to the North American Subaru Impreza Owners Club Saturday August 30, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Electrical & Lighting

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 04-06-2013, 10:23 AM   #1
Fonzey
Scooby Newbie
 
Member#: 338440
Join Date: Nov 2012
Default 2005 STI - Body Integrated Unit?

Hi All, it looks like I've managed to blow something up - Google suggests my BIU.

I was swapping out the LED illumination (to red bulb) in my ignition ring on my 2005 WRX STI (UK Spec, not sure if it differs from the US cars but it's a Widetrack Blobeye with a Hawk facelifted interior).

When swapping out the bulb, I realised my LED wouldn't fit back into the hole built into the ignition ring because it's too... "bulbous". I decided to revert back to the green bulb while I can order a smaller red one.

Since doing that however, my Dome light and Ignition Ring light remain on even when all car doors are closed/locked/etc. I'm working around it by removing the ignition ring bulb and keeping the dome light set to "off" rather than on the middle notch.

Google suggests I've damaged the BIU, probably by shorting something out whilst doing the change (I left battery connected, schoolboy error ) but I'm having real difficulty actually locating my BIU so I can inspect it and gauge whether it's worth getting hold of a spare.

I've gone under my footwell and found two small square boxes - but after googling the serial numbers it turned out to be a central locking unit and the DCCD unit.

I've googled images of the BIU and it seems to be black with a "integrated unit" label on it - but I can't find mine anywhere under the steering rack!

Any ideas, or other potential fixes to my problem?

I can confirm there are no faulty door switches as the "door open" alarm on the dials only comes on when a door is actually open - so this issue seems isolated with the dome light and ignition ring.

Thanks
* Registered users of the site do not see these ads.
Fonzey is offline   Reply With Quote
Old 04-06-2013, 12:56 PM   #2
Fonzey
Scooby Newbie
 
Member#: 338440
Join Date: Nov 2012
Default

I found the below near by the steering rack and when googling the number it comes up as "Central Locking Relay Module".



When I unplug this unit (both grey plug and blue plug) the dome light remains on when set to "on", but in "auto" it switches off (whether a door is open or not).

Could this unit be my problem? If so can they be swapped between cars without reprogramming etc?
Fonzey is offline   Reply With Quote
Old 04-06-2013, 02:50 PM   #3
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

Those lights are most likely controlled by switching the ground connection to them. I don't think you damaged anything but you may have caused a ground connection to a place that isn't suppossed to be by working on the wiring so check that out. The module might be on the passenger side of the vehicle under the dash but I'm not real sure.
Cougar4 is offline   Reply With Quote
Old 04-06-2013, 02:58 PM   #4
Fonzey
Scooby Newbie
 
Member#: 338440
Join Date: Nov 2012
Default

Quote:
Originally Posted by Cougar4 View Post
Those lights are most likely controlled by switching the ground connection to them. I don't think you damaged anything but you may have caused a ground connection to a place that isn't suppossed to be by working on the wiring so check that out. The module might be on the passenger side of the vehicle under the dash but I'm not real sure.
Thanks Cougar, your name came up in several search results for similar faults so I was hoping you'd see my thread!

I've had the steering column shroud off a few times now checking for broken or stripped wire, and I really can't see anything amiss.

I've got a multimeter but I don't really know where to start in terms of checking stuff out... I've only ever used one before to identify breaks in a circuit, not accidentally grounded ones!
Fonzey is offline   Reply With Quote
Old 04-06-2013, 06:38 PM   #5
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

Using a meter to make various types of tests is pretty easy to do, it just takes a little getting used to. Once you learn how to do things you will wonder how you got by without it. Check out YouTube and the net for videos on how to use a meter.

I think you made a ground connection to a place that shouldn't be grounded when you put things back together. I suggest you back over the work you did and look for a connection touching ground of the chassis. I would guess the ignition ring is the most likely supect. If there is connections you can get to without taking things apart you could separate them and see if the trouble clears up.

To see if there is a connection to ground it might be easier for you to check for DC voltage first on the circuit. To do that you set the meter to funtion to DC volts. Then place the black COM lead of the meter to a good ground point of the car chassis. Then you place the red probe on things you want to test. These lights are turning on because something is causing the return sid eof the lights to tie to ground which the module should be doing normally. When the red probe is tied to a connection to ground the meter reading will be very close to zero volts since that is where the referece (black) lead is tied to also. It may just be easier for you to look for a connection touching ground that shouldn't be than using the meter. At least until you get a little familiar with it.

We really don't know for sure if there is a problem with the module but once you find it you could disconnect it and then see if the lights go out or not. If my suspicions are correct then removing the module would make no difference in the lighting condition sice the ground to them is at another point in the circuit.

Another thing to look for is perhaps a screw may have pierced a wire when you put things back together and that is causing the ground connection.

Last edited by Cougar4; 04-06-2013 at 06:46 PM.
Cougar4 is offline   Reply With Quote
Old 04-09-2013, 10:36 PM   #6
Seahawk
Scooby Newbie
 
Member#: 71665
Join Date: Oct 2004
Chapter/Region: South East
Location: Wilmington, NC
Vehicle:
1994 Impreza
w/ 03 WRX Swap

Default

I'm not sure that's the integrated unit. I just stripped a WRX harness from a car and the integrated unit was black with one plug. It was bolted to the dash beam behind the cluster above the clutch pedal.

I've read about the dome light not coming on with the doors due to a failed connection on the BIU circuit board, but not them staying on.
Seahawk is offline   Reply With Quote
Old 04-19-2013, 12:28 PM   #7
Fonzey
Scooby Newbie
 
Member#: 338440
Join Date: Nov 2012
Default

Hi Guys, just posting as completion really incase anybody else gets the same symptoms.

It was indeed the white central locking unit which had failed (with 88251SA000 printed on the side of it).

I swapped it 35GBP on eBay and it fixed the issue right away. Hopefully I don't have a short hidden somewhere which will kill this one too, but time will tell I guess.
Fonzey is offline   Reply With Quote
Old 04-20-2013, 07:51 PM   #8
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

A true short would blow the fuse.
Cougar4 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 04:53 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.