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Cosmetic Modification (Interior/Exterior/Lighting) Discussions about cosmetic mods. |
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05-27-2014, 01:37 PM | #1 | |
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LED interior light upgrade causes computer failure
This was sent to me by Rick in Spokane ( @Oliverrick ) via email.
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05-28-2014, 12:13 PM | #2 |
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05-28-2014, 01:26 PM | #3 |
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Thats what had happen to me, yes. Installed LED lights in the courtesy spot, the light would not shut off even when the door was closed. The BIU needed to be replaced.
Not sure why it did this, but I have LEDs in there now and have since that happened and haven't had any issues. I really advise anyone replacing these bulbs to remove the battery power first before swapping them out. With the door obviously having to be open, you have to take the bulbs out while that line is live. Not sure if it short circuited because of that, but its the only logical thing I could think of. As far as installing window tints, not sure if other installers do this but mine backed off the bolt from the sensor in the door, which makes the window go back up (like the door is shut). when he needed to lower it, he simply just tightened the bolt back down and it functioned as normal. Obviously if the LEDs worked fine before they touched anything, its something THEY did. Maybe they did as my installer did and loosened that bolt allowing the window to roll up, and maybe they possibly short circuited it. |
05-28-2014, 01:27 PM | #4 |
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If you shorted out the circuit when installing the led's then you fried the lighting BIU. I did this to mine within 2 months of ownership. Subaru replaced mine for free. The pain in the ass part is when they install the new BIU they have to reprogram everything and the key fob and it takes about 5 hours to do this.
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05-28-2014, 02:03 PM | #5 | |
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Leds work fine afterwards ? |
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05-28-2014, 02:03 PM | #6 | |
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05-28-2014, 02:22 PM | #7 |
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@ucsmfu - when I got the new BIU I actually replaced it exactly the same way. I didn't unplug the battery lol...but I recommend to. I actually wanted to see if it would do it again, since it was covered under warranty for me.
LED's work fine now, have been for over a year. |
05-28-2014, 03:21 PM | #8 | |
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05-28-2014, 03:32 PM | #9 |
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Said this in the other thread, but I'll say it again.
If the OEM is stupid enough to not use a fuse on a circuit that could potentially short out and damage an expensive component, it's all on them. It's what they're there for. There's always a possibility of water getting into the door (that's why they have weep holes at the bottom) and shorting it out. Just seems like a terrible oversight IMHO. |
05-28-2014, 03:47 PM | #10 |
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There was a whole thread a couple of months ago where the OP posted a statement from SOA that putting LEDs in the circuit can cause a BIU failure because the current is less than the expected current.
I called BS because that means that a bulb burning out will also cause a BIU failure due to the current being less than expected..... My guess is that most of these BIU/ECU failures being related to LED installations is operator error during installation coupled with a poorly designed bulb socket. (prone to shorts during insertion/removal). |
05-28-2014, 04:26 PM | #11 |
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I deal with micros at work and IMO, if you're playing w/ LEDs, you need to make sure that it has at least a resistor to control the current. Connecting power supply -> LED -> computer is not advisable. There's a huge potential of current surges that will go straight to the computer.
The problem that I see with most LED dome lights is that they connect LEDs in series and parallel. Since each LED drops voltage anywhere from 1.5v to 4v (LED dependant), they need to stack them to be compatible with 12v. Even then, you still don't have control of the current running through them. That's why all high power LEDs have a current controlled driver. |
05-29-2014, 08:56 AM | #12 | |
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I did the exact same thing the second time around that I did on the first. I also installed the passenger side the first time around with no issue. For me at least, it was definitely NOT install error. Not sure wtf happened. |
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05-29-2014, 10:26 AM | #13 | |
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These two threads talk about the same thing happening to others: http://www.ft86club.com/forums/showthread.php?t=63592 http://www.ft86club.com/forums/showthread.php?t=60355 |
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05-29-2014, 10:30 AM | #14 | |
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