LCM Programming

[lkv0315]

I'm not sure if anyone knows where to find this info or where to look other than here, so here I am. I am working on a custom project to give the E53 Sequential turn signals and side markers, along with a lock/unlock sequence. Is there a way to set the voltage that the LCM outputs for certain actions, or is it always 12v? I'm planning to use a microcontroller which I will have to supply with switched 12v anyway, so I was hoping to set it up to detect different actions from the LCM, like if the lights are just on versus turn signal on versus lock/unlock blink. If you guys also happen to know an easier way to do this and I'm just making it too complicated that advice would be appreciated too! Thanks for any tips you can provide!

[80stech]

The LCM modulates brightness by pulse width. If you are using a micro controller then in theory you should be able to detect on/off and brightness and output accordingly. I think there are 2 or 3 different brake/tail lite strategies though so keep that in mind.

[lkv0315]

Originally Posted by 80stech

The LCM modulates brightness by pulse width. If you are using a micro controller then in theory you should be able to detect on/off and brightness and output accordingly. I think there are 2 or 3 different brake/tail lite strategies though so keep that in mind.

So would you recommend I try using an oscilloscope to see what the different stages and frequencies are? That makes the most sense to me at least

[80stech]

That would be a good start, frequency should be consistant with only the pulse width changing. You might consider monitoring inputs at the LCM instead of outputs as well.

[Clavurion]

What do you mean by sequential indicators?

Indicators flashing when locking/unlocking is already a factory coding option.

Indicators are supplied with the same voltage regardless of the purpose they are activated. Only when front side light fails the indicator is activated to be on permanently with lowered voltage.

[80stech]

Sequential like mustangs had back in the day, some newer vehicles have them too. I've noticed a few vehicles that have them that shouldn't, so I'm thinking it's "a thing" now. I assume he is going to incorporate the brake lites into the system as well (depending how the bulbs work out) and probably some kind of fancy light show when he sets the alarm.

[Fifty150hs]

Originally Posted by 80stech

Sequential like mustangs had back in the day, some newer vehicles have them too. I've noticed a few vehicles that have them that shouldn't, so I'm thinking it's "a thing" now. I assume he is going to incorporate the brake lites into the system as well (depending how the bulbs work out) and probably some kind of fancy light show when he sets the alarm.

Sequential turn indicators on the side are available in LED on line. They're plug and play. If you get an android head unit with the Resler module and the IBUS app you can program all kinds of "light shows". Not sure how it works as I'm not interested in figuring out as I wouldn't use it, but it's available. Might be a cheaper simpler route to go than buying/building some special module jsut for the LCM with the added advantage of Nav, multiple apps, etc.

[80stech]

I don't think the young guy is looking for the simpler route and cudos to him for that!
Micro controllers are between $3 and $10 the drivers and other stuff might be another $20 but the experience, knowledge, and pride, priceless! This almost a breath of fresh air that we have some younger guys thinking this way! Buying the ready made version is kind of buying a ready made noise maker to clothes pin onto your bike when you where a kid.

[lkv0315]

Originally Posted by 80stech

I don't think the young guy is looking for the simpler route and cudos to him for that!
Micro controllers are between $3 and $10 the drivers and other stuff might be another $20 but the experience, knowledge, and pride, priceless! This almost a breath of fresh air that we have some younger guys thinking this way! Buying the ready made version is kind of buying a ready made noise maker to clothes pin onto your bike when you where a kid.

This is exactly what I'm thinking and I appreciate you seeing what I'm trying to do! I have decent experience with some programming and electrical design as I am currently getting my college education in engineering. I'm always in pursuit of learning more and pushing my boundaries, plus I hate paying for labor
I'd rather just buy the parts and do it from scratch myself! The only issues I've been having are accessibility to things that aren't something I can manufacture, like a new taillight lens, as that's not an individual part you can order.

Now that you bring it up the way that you did about it being a thing of pride and you recognize that I'll do my best to make periodic updates and I'll do my best to make everything publically available, plus if people really like the end product, I may even manufacture them and sell in small quantities to those interested, but that may be years down the road.

P.S. If anyone knows how to:
a) Make your own reproduction taillight lenses pretty easily
b) knows where I can buy a real taillight lens that I can put on a factory housing
c) If you can make taillight lenses
Please either reply or send me a message!

[80stech]

Why not use the original tails lites? or maybe get a set of replace LED lite assemblies you can play with and still have the originals to put back in? I don't think it would be hard to put some extra bulbs and dividers into the lamp asemblies. I imagine you are going to use the tailgate portion as well? What are you using for a micro controller?

Hey I just realized you are CanBus guy, what happened with that??