Funny you mention this as I was reading about it the other week. Im fairly certain that you could apply the same coding to enable it on our cars. Nice feature to have if you have a scenario where you brake very hard and need to notify cars behind you that you have come to a stop.
It engages when you slam on the breaks near or to the ABS point. If you brake this hard and come to a stop, the lights flash fast as long as your brake pedal is still being pressed and only when you release the pedal does it reset.
It engages when you slam on the breaks near or to the ABS point. If you brake this hard and come to a stop, the lights flash fast as long as your brake pedal is still being pressed and only when you release the pedal does it reset.
I'll be honest, ive never had to slam on by brakes to the limit like that on the street. But it would be peace of mind knowing that the feature exists so you dont slammed from the rear. For guys that track a lot, its probably an annoyance so I wouldnt explore this feature.
Bumping this thread-- anyone successfully code brake force display on the e39? The LCM looks to have some BFD related values, but they don't seem to have any effect? Maybe I need a newer LCM/firmware flash on it?
I actually have a newer (automatic headlight) LCM I'm going to install, to add automatic headlights-- just need to get PASoft working so I can virginize the module. But, I could update the firmware on it at the same time, if it would help...
I looked into it and you would basically be enabling it like it is coded on a X5, but there's the issue that you would not have the secondary lights that go bright when BFD is activated. On a X5, you have 2 bulbs that do tail lights, while 1 of them goes brighter for the brake lights. The wires that are run to our running lights and brake lights are different. The running lights on our facelift e39s are LED, so you won't get BFD on those since they are PWM and should not go any brighter than they already are. If you were to wire the X5 extra running light wires (the ones that get activated by BFD aka the upper ones) to the rear fog light sockets in the e39 tail lights, it should work, but then you would end up with a running light in the rear fog light location. Not sure if you want that. There's not really an easy way for facelift E39s to do it, but you might possibly be able to make the running lights on a pre-facelift do it with a bit of rewiring.
Not possible to do something like the e46 touring (never saw facelifting) on the e39?
Cliffs:
No BFD (normal braking) uses lights as normal)
Stage 1 BFD adds the rear fogs (bright!) as brake lights
Stage 2 BFD (abs engaged) keeps the rear fogs as brake lights and strobes the 3rd brake lights and outer normal brake lights
There are a lot more options on the e46 LSZ for BFD than on the LCM IV in the e39/e53. There is a specific setting for whether BFD uses the inner lights or the rear fog lights that is in the e46 LSZ, but not in the e39/e53 LCM. That means that you're stuck with the wiring that the X5 used, which would be the inner lights in our case. Now, the pin that the upper tail lights use on the X5 that is tied to the BFD is pin 13 on the X38 plug of the LCM, which is unused in the e39. You could run a wire all the way from the LCM to the rear fog light and put a socket there, but again, you'll have a dimmed running light there when the lights are on, but it should work as expected for the BFD after coding it on.
Actually, I think I might have figured out a way to disable the tail light on the BFD bulb if you wire it up as mentioned above. Since the X5 doesn't have the LED tail light option, it might disable the upper tail light if you turn the LED tail light option on (default for facelift e39s anyways). The LED running lights use a different pin than the upper tail lights on the X5. Of course, it's possible that it just won't work at all if the LED tail light option is enabled. If I feel adventurous enough, I'll run a wire to pin 13 on X38 and wire it to a bulb I can see in the cabin, then code the BFD on and see first of all if it lights up with the lights, then attempt to activate BFD and see if it lights up. I just recently had the LCM out on both my e39s and it's not a lot of fun, so we'll see. I have LCM IVs in both my e39s, which have those options.
Does the E46T need to be rewired to enable this feature? I'd like it on mine. People have remarked that my LED tails don't have a big delta between "on" and "braking" as standard bulbs.
The BFD issue on E39 is already resolved, i have it running on mine for over a year now.
The second set of lights on the facelift models for BFD is not a big problem, rear fog lights can be used for that purpose, but it requires a slight modification of adding a two pairs of diodes.
Next option is to use turning lights for BFD, it requires a bit different coding and a bit of rewiring, this is the option that im using
I have written an explanation and a guide what to do in my language, just need to translate it and then i will post it.
I posted now a lot shorter version and it still needs to be moderated, so i posted a translation on our forum in Slovakia.
Here is the link to the translated part, but only for e39 with stock facelift LED lights, just copy-paste the link.
bmwklub.sk/post1291058.html#p1291058
Question, if you happen to know:
Is LCM3 --> LCM4 a firmware update or a hardware update? On the e46, we can enable features (e.g. tripple blink turn signals) but updating the firmware on the LCM to a later verson-- curious if that applies here, too.
(not even sure this applies to me, since I don't remember if I have a 3 or a 4 off the top of my head)
LCM modules had no SW updates possible as far as I know.
And also there shouldn't be differences between modules for e39 and e53.
I got myself a LCM4-C24 from ebay, the module came from a X5 but the coding in NCSdummy is identical for both models, so I would say that you just need to select correct options for the bi-xenon setup.
And don't forget that if you want to use bi-xenon from LCM you need to get rid of the LWR module an wire all that directly to the LCM, and only LCM4 supports that.
btw. I also have my bi-xenon just wired to halogens.
This is not true, LCM4 for e39 is c20-c22, while x5 facelift got c24. C24 is HW 7, while the earlier ones had HW 5. It's a physically different chip, but TerraPhantm bought spare chips and swapped it to the newer chip on a hw5 lcm4, then loaded a firmware backup from the hw7 lcm4 and it gave different options to make native bi-xenon work properly. It did not before. To do the wiring, you leave the halogens wired as-is and wire one wire from the bi-xenon activation pin on lcm to the shutters, then wire the other shutter wire to ground. There are then two coding changes to make it work.
Good to know, i bought the newest module possible just so i'm sure i will have everything in case i need it. :grin
And about the wiring i know, was looking into it already when i did my bi-xen retrofit, but dropped it because its too much trouble for little function, and if some idiot is blinding, then he deserves to be flashed properly. :smile
I know it is only one wire for bi-xen.
The problem is that the output where you need to connect it is also the power supply for the LWR module (automatic headlight adjustment).
It depends on the programing of course, if you want bi-xen you wont get power supply for LWR and vice versa.
So i would need to get rid of the LWR module and rewire everything from LWR to LCM, and only LCM4 can replace the function of LWR.
Not true, my wagon had an LWR module and I just wired the power to one of the parking light wires so it turns on with the running lights and is off when the lights are off. Works great. On my sedan, it came with lcm4 from the factory with integrated LWR, so putting the chip swapped lcm4 with LWR integrated (same as what was in the car to begin with, just with the newer chip and firmware from the c24) worked without more than just the activation wire.
So, in summary, there is one new wire to run and if you have the LWR module, one wire that needs to be tapped to another nearby wire. Still, not bad.
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