Leds could potentially blow ECU or BSI on 86?

[dssence]

Originally Posted by Simon99

Found at http://www.subar/brzforum.com/9-suba...s-doors-2.html

(Left out the u in subaru if you want to see the link, I don't see why we couldnt cooperate to solve a problem together)



Sent from my SGH-I337M using Tapatalk

Hi listen do you have any more insights about how the BIU works on our cars Subaru BRZ / FRS / Toyo86 ? . I really need to be sure before replacing the parking lights bulbs with led strips on my car I don't want to go through all the hassle and stress of replacing a fried BIU with my dealer.
What's the correct precise way to avoid the BIU bouncing back high current from the led strip connected.
Thanks

[stugray]

I call complete BS!

"Well it is official. LEDs fried my BIULEDs require put a lower resistive load on the circuit, which means a higher current than intended reaches the BIU, (Computer that controls many electronic functions that are on switches/timers etc) and consequently fried it."

So they are saying "If the circuit pulls less current than designed for, then the computer will get fried"

So what happens when a bulb burns out or gets removed?
Fried computer? If that was true there would already be a recall.....

And "which means a higher current than intended reaches the BIU" Is not even how electricity works.

[dssence]

Originally Posted by stugray

I call complete BS!

"Well it is official. LEDs fried my BIULEDs require put a lower resistive load on the circuit, which means a higher current than intended reaches the BIU, (Computer that controls many electronic functions that are on switches/timers etc) and consequently fried it."

So they are saying "If the circuit pulls less current than designed for, then the computer will get fried"

So what happens when a bulb burns out or gets removed?
Fried computer? If that was true there would already be a recall.....

And "which means a higher current than intended reaches the BIU" Is not even how electricity works.

Hi listen, I've been talking to guys who repair BSI body systems interface boxes from siemens,bosch to name a few. Bosch and Siemens may manufacture these BSI for peugeot, volkswagen , mercedes benz, but the thing goes some of these boxes have larger tolerance than others regarding circuit design and how they react to system damage in terms of tolerance. That's why some fail mostly on low end cars and for an obvious reason on mercedes benz they have a broader spectrum tolerating variations in amperage. Same applies to components used on circuits for military grade and for aerospace.
He did say, and emphasize that leds once installed to replace normal incandescent bulbs, for an obvious reason will draw less amps , that in turn will make the BIU bounce more amps cause the amps missing are being refelcted back to the circuit which in turn might overheat or generate parasitic currents (which by the case there are in a car) and damage the BIU. Believe it or not.
Add to the fact that LEDS are diodes so voltage goes one way, not like incandescent bulbs were voltage goes through the filament, and there's a couple things going on here.
The only safe way to replace leds is to have a stock car with a BIU designed properly to handle the amount of amps from a led. Or I'm not sure but some cars may already come with a driver circuit to avoid these problems.
It's not rocket science, I do have some electronics background and after seeing all this happeing I wouldn't like my Toyo86 BIU to blow out. Not something really nice to go through.
The reason why some ppl are not having any problems is cause that same led bulb they are using might work fine on a specific circuit of the car but at the same time might not and cause failure in the future in other segment of the cars circuit.

[Acree]

There's so much misinformation in this thread...

I'll try to respond with a well thought out response tomorrow. It's too late tonight, but I can absolutely assure you that putting a properly functioning LED strip or assembly in your car will not ruin the body control module.

[Crazy Drew]

[ame="http://en.wikipedia.org/wiki/Ohm%27s_law"]Ohm's law - Wikipedia, the free encyclopedia[/ame]

/thread

[kiichiro]

Been trying to fry my ecu for a year now

[stugray]

Originally Posted by dssence

Hi listen, I've been talking to guys who repair BSI body systems interface boxes from siemens,bosch to name a few. Bosch and Siemens may manufacture these BSI for peugeot, volkswagen , mercedes benz, but the thing goes some of these boxes have larger tolerance than others regarding circuit design and how they react to system damage in terms of tolerance. That's why some fail mostly on low end cars and for an obvious reason on mercedes benz they have a broader spectrum tolerating variations in amperage. Same applies to components used on circuits for military grade and for aerospace.
He did say, and emphasize that leds once installed to replace normal incandescent bulbs, for an obvious reason will draw less amps , that in turn will make the BIU bounce more amps cause the amps missing are being refelcted back to the circuit which in turn might overheat or generate parasitic currents (which by the case there are in a car) and damage the BIU. Believe it or not.
Add to the fact that LEDS are diodes so voltage goes one way, not like incandescent bulbs were voltage goes through the filament, and there's a couple things going on here.
The only safe way to replace leds is to have a stock car with a BIU designed properly to handle the amount of amps from a led. Or I'm not sure but some cars may already come with a driver circuit to avoid these problems.
It's not rocket science, I do have some electronics background and after seeing all this happeing I wouldn't like my Toyo86 BIU to blow out. Not something really nice to go through.
The reason why some ppl are not having any problems is cause that same led bulb they are using might work fine on a specific circuit of the car but at the same time might not and cause failure in the future in other segment of the cars circuit.

There is so much wrong with the description above that ..... I will just let Acree have a chance to pipe in.
Like I said - "So if a bulb burns out, the BIU gets fried right?"

I dont think so or there would already be a recall.

If the system works as described above then it is a serious design flaw.

Oh, and I slept at a Holiday Innn Express last night.

[dssence]

So we should wait Acree to jump in. But this is what someone posted on my thread on eevblog forum

It sounds as though a clear understanding of Ohm's law and the V-I characteristics of an LED are called for.

I find it hard to believe that LEDs with a proper series resistor would blow a circuit designed to drive a conventional filament bulb, but I can see how it might happen. A bulb has a fairly linear V-I characteristic, but a string of LEDs with a small value series resistor has one which is much steeper. It might draw much less current than the filament bulb at 12V, but a great deal more at 14V. Both LED string and driver could be damaged.

I'm going to take a stab in the dark here, but I guess you connected the LED strip in parallel to the existing headlight bulb? So if the LED strip's resistance is lower than the headlight, then the total resistance for that circuit will be lower (a large resistance and a small resistance in parallel, blah blah). And hence, the current through that circuit would be higher.

If the BIU is rated for a certain maximum current, then yes, adding that LED strip could damage it (especially if it is near its maximum design limits with just the headlight bulb).

[stugray]

"If the BIU is rated for a certain maximum current, then yes, adding that LED strip could damage it (especially if it is near its maximum design limits with just the headlight bulb)."

I can almost guarantee that: either the BIU does not directly drive the headlamps (that's what relays are for) OR the drive circuit is designed to handle greatly varying amounts of current.
Since the BRZ has different lights than the FRS, does this mean they need to change the BIU between the two models? Dont think so.

[dssence]

Originally Posted by stugray

"If the BIU is rated for a certain maximum current, then yes, adding that LED strip could damage it (especially if it is near its maximum design limits with just the headlight bulb)."

I can almost guarantee that: either the BIU does not directly drive the headlamps (that's what relays are for) OR the drive circuit is designed to handle greatly varying amounts of current.
Since the BRZ has different lights than the FRS, does this mean they need to change the BIU between the two models? Dont think so.

So now I'm thinking it twice before making the mod to my parking lights you see in the pic here. If I was about to replace the light bul with the led strip alone that would increase the amperage you say? how could that be possible if these led strips consume a couple milliamps?. What I do now is they don't have any load resistors they only have resistors to restrict the amount of voltage so they don't blow up.
SO i think the only possible way I could go is to replace it with T10 led bulbs . I really wanted to add these led strips .

[dssence]

So should I use this with the led strip ?

http://www.carid.com/universal-bulbs...-10063403.html

[Caharin]

Hey, got the heads up about this thread from my brzforum post on the LED Door Lights.

Nick from Diode Dynamics on my thread is right, the simplest way to fix the issue I had was to remove the lamp housing from the harness, plug in the LED bulb to the housing then reconnect the assembly to the harness. The LEDs simply aren't the problem.

I realize that you are attempting to do something different than this, however, like I imagined, the nonsense from the dealer that "the lower voltage requirement for an LED" are what cause the BIU to be fried is just that. He didn't want to have to replace my BIU at first, and jumped to a bad conclusion just to give me an answer.

I'd say that a short circuit is what fried my BIU, and (obviously) this should be avoided at all costs. But as far as LEDs hurting your BIU, I don't believe it. I have had map light, vanity lights, door lights , reverse lights, and marker lights all replaced with LEDs from Diode Dynamics and they are still going strong months later with no problems at all.

Hope this helps.

[dssence]

Originally Posted by Caharin

Hey, got the heads up about this thread from my brzforum post on the LED Door Lights.

Nick from Diode Dynamics on my thread is right, the simplest way to fix the issue I had was to remove the lamp housing from the harness, plug in the LED bulb to the housing then reconnect the assembly to the harness. The LEDs simply aren't the problem.

I realize that you are attempting to do something different than this, however, like I imagined, the nonsense from the dealer that "the lower voltage requirement for an LED" are what cause the BIU to be fried is just that. He didn't want to have to replace my BIU at first, and jumped to a bad conclusion just to give me an answer.

I'd say that a short circuit is what fried my BIU, and (obviously) this should be avoided at all costs. But as far as LEDs hurting your BIU, I don't believe it. I have had map light, vanity lights, door lights , reverse lights, and marker lights all replaced with LEDs from Diode Dynamics and they are still going strong months later with no problems at all.

Hope this helps.

Hi caharin thanks for following up my post. So in my case what do you recommend me doing? I want to add a led strip here .



That's the bulb which it's t10 5watts , this light turns on when I switch on the instrument panel light so it's in parallel with those lights.
What's the safest way to add a led strip there?. And what you said about a shortcirctuid wouldn't a shortcircuit blow the proper fuse ? that's why fuses are there.
Thanks for jumping in

[Simon99]

Originally Posted by Caharin

Hey, got the heads up about this thread from my brzforum post on the LED Door Lights.

Nick from Diode Dynamics on my thread is right, the simplest way to fix the issue I had was to remove the lamp housing from the harness, plug in the LED bulb to the housing then reconnect the assembly to the harness. The LEDs simply aren't the problem.

I realize that you are attempting to do something different than this, however, like I imagined, the nonsense from the dealer that "the lower voltage requirement for an LED" are what cause the BIU to be fried is just that. He didn't want to have to replace my BIU at first, and jumped to a bad conclusion just to give me an answer.

I'd say that a short circuit is what fried my BIU, and (obviously) this should be avoided at all costs. But as far as LEDs hurting your BIU, I don't believe it. I have had map light, vanity lights, door lights , reverse lights, and marker lights all replaced with LEDs from Diode Dynamics and they are still going strong months later with no problems at all.

Hope this helps.

Bro thanks for doing an update on this forum, sorry if I quoted you without asking but I though in the end we're all trying to take care of our cars !

Sent from my SGH-I337M using Tapatalk