Help with LED brake lights

[Dannyx]

Re: Help need Panasonic bios

Wrong thread I'm afraid

[sanjurahul]

Help need Panasonic bios

guys please Panasonic CF-53 schematics and bios

[WildPuppy]

Re: Help with LED brake lights

... (may have to use google translate or ask me personally if you really want to dig into it)....

Hehehe you're funny, you're not very keen on details, are you? I'm from the same shithole known as RO.

Ok, joke aside, I know you said that for all the other members.
I have to agree with petehall347 here and think you need a special relay for LEDs since in the schematic it is not very clear how the relay or the brake pedal contact works internally. Let's say it is more like a block diagram (quite usual in auto industry) than a true schematic.
Did you try the specialized local forums like DaciaClub and Duster? They are quite large forums with a lot of helpful members.

[Dannyx]

Re: Help with LED brake lights

yes i just read your post . lamps need to be drawing current or it throws faults .

You sure about this ? How can you tell ? I know for sure this is valid for the turn signals - if a bulb burns out or is removed, the ECU beeps/blinks faster and I tried it myself - but not sure it applies to the brake lights too...

[petehall347]

Re: Help with LED brake lights

you may need a relay for led lights . if it uses relays that is
yes i just read your post . lamps need to be drawing current or it throws faults .

[Dannyx]

Re: Help with LED brake lights

Here's the wiring diagram for this particular car (may have to use google translate or ask me personally if you really want to dig into it).

Have a look on page 65 which shows the braking circuit, with box 160 on the left side being the pedal switch...there doesn't seem to be any additional circuitry there - just toggles between GND and VCC, HOWEVER notice box 118 below it, which according to the legend is the ABS control unit, that is, when you press the pedal, VCC also goes to it, which makes sense: the ABS unit needs to know when the bloody pedal is pushed in...don't know how or IF it affects our issue with the LED lights...

[Dannyx]

Re: Help with LED brake lights

No it's definitely not "old" - got it new in 2007...some may even be familiar with the model: it's the world famous Dacia Logan Anyway. I'll have a scrub though the wiring diagram - you may be right. There may indeed be some electronics involved and the two rear lights are not paralleled after all, so the functionality of one doesn't guarantee the other one works as well...

I have seen others do this sort of mod and it worked without any issues, though the bulbs weren't identical - I reckon they had two individual separate "stings" of LEDs for high and low brightness...

[WildPuppy]

Re: Help with LED brake lights

It may be that your car is not as old as you let us believe and it has light bulb checks integrated in the logic. In this case, when it "senses" that the filament is not there, it may cut the power going to that bulb (or line of bulbs) or at least show an alarm light on the dash board.
In this case, an filament equivalent resistor should be added in parallel to each LED branch to tell the on-board computer that the light bulbs are OK.

Just my two cents... I am by no means a specialist, more like an heavy car user.

PS: maybe this may help ? I admit I didn't read it all...

[Dannyx]

Re: Help with LED brake lights

Ok guys, back on this project, since I didn't have much time. I set up the...setup on the bench trying to replicate the one in the car as closely as possible: regular dual filament bulb in parallel with LED lamp with diode. I connected both filaments in the dual filament bulb to + straight off the adapter to simulate both the parker and the brake being pressed (no diode in between) then connected the parker terminal of the LED bulb to the adapter directly (no diode here either) then the brake terminal through the diode as well and it works: the LED lamp becomes brighter when I touch the cathode of the diode to the brake terminal...great....so why the hell isn't it working in the car ? It's extremely annoying...

[Dannyx]

Re: Help with LED brake lights

I was planning on doing just that.

[petehall347]

Re: Help with LED brake lights

wire a standard bulb in parallel next to each led . i know it sort of defeats the object but will get the job done . its that or large resistors in parallel . had to wire in bulbs on a motorbike indicators . also had to fit diodes in the speedo head .
does the car have bulb out warning light on dash ?

[Dannyx]

Re: Help with LED brake lights

I shall. I'm also thinking the LED bulb doesn't like being in parallel with a regular filament one...I shall experiment on the bench first though - much easier, though it could yield inconclusive results as we just saw: I wasn't thorough enough in my original diode test, I saw it working on the bench and thought there's be no way it wouldn't work on the real thing, so I just rolled with it only to run into the aforementioned issue....

[WildPuppy]

Re: Help with LED brake lights

Try one diode per each circuit. Other than that, get some more expensive but properly built LED replacements

[Dannyx]

Re: Help with LED brake lights

Wouldn't this work if your schematic were correct?
I am sure you have some relays there in the car, nothing is wired directly to the consumer...



Depending on the power those LED's and whatever else is inside that bulb draw, it may have to be a strong diode...

That is what I tried and it only solves half the issue: the LED lamp no longer turns off when the brake is up (grounded), but it doesn't change intensities either when the brake IS depressed.

[WildPuppy]

Re: Help with LED brake lights

Wouldn't this work if your schematic were correct?
I am sure you have some relays there in the car, nothing is wired directly to the consumer...



Depending on the power those LED's and whatever else is inside that bulb draw, it may have to be a strong diode...

[WildPuppy]

Re: Help with LED brake lights

Not exactly identical to your problem, but still similar...

https://www.youtube.com/watch?v=tci97uxfptA

OffTopic: Happy Easter

[Dannyx]

Re: Help with LED brake lights

Nope - it's around 12.5v at the socket no problem. Didn't have the time to tinker with this project anymore, with Easter being right around the corner you know, but I shall return to it somewhere next week I expect if all goes well...

[gabik111]

Re: Help with LED brake lights

Anyone mentioned about voltage? Running car on idle supply about 12.8V-13.2V, above 1k-1.5k rpm 14.4V but with engine shut off 11.8-12.1V . If battery is bad it can be much less.
I would focus on this and measure voltages in the car just at the lamp connector.

[stj]

Re: Help with LED brake lights

btw, another option is to mod or replace the brake switch - i'v never seen one do that.
is it 3 wires, or grounding through the casing? obvious answer is cut the ground.

[stj]

Re: Help with LED brake lights

the diodes should work,
can you post a photo of the led lamp?
i'v seen some with a semiconductor based dropper,
and some that use 2 groups of leds, one for low brightness and both for high.

did you check resistance between the contacts in all combinations?