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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > Rear turn indicator failure

View Poll Results: Have your M2C rear indicator units failed?
Yes 135 63.68%
No 77 36.32%
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      09-25-2020, 03:32 PM   #155
AndrewC1989
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Quote:
Originally Posted by Poochie View Post
The "bulb check" circuit in these vehicles was a holdover from when BMW used incandescent lights, which was implemented to detect what it believes to be a burn out light bulb.

The bulb check system doesn't distinguish between LED or incandescent bulbs power draw, however, in BMW's infinite wisdom, decided to leave the "warm bulb check" active with their LED setup, making the system assume that there an incandescent bulb outage, when it in fact the LEDs are fine, just merely using less current, by nature.
Stupid question: what's the difference between a warm and cold check?
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      09-25-2020, 09:07 PM   #156
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Quote:
Originally Posted by AndrewC1989 View Post
Quote:
Originally Posted by Poochie View Post
The "bulb check" circuit in these vehicles was a holdover from when BMW used incandescent lights, which was implemented to detect what it believes to be a burn out light bulb.

The bulb check system doesn't distinguish between LED or incandescent bulbs power draw, however, in BMW's infinite wisdom, decided to leave the "warm bulb check" active with their LED setup, making the system assume that there an incandescent bulb outage, when it in fact the LEDs are fine, just merely using less current, by nature.
Stupid question: what's the difference between a warm and cold check?
Hey,

So for "Cold Bulb Checks," the bulbs are switched on by a short current pulse without the bulb being powered up.

"Warm Bulb Checks" while the lights are powered on, the hot monitoring measures the individual power outputs, to assist in detection of any short and open circuits. A faulty incandescent bulb is detected within approx. 2 seconds.

For the record, LEDs are not cold-monitored, as LEDs react too quickly and would light up or strobe, when powered off.
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      10-08-2020, 10:42 AM   #157
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So the day finally came.
I was actually on my way to the service dept. for my 30,000 miles service when it happened. How convenient.
‘Rear left’ turn signal malfunction.
I’ll update you guys with what they decide to fix.
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      10-08-2020, 01:57 PM   #158
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30k miles on a 20? Wow.
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      10-08-2020, 02:55 PM   #159
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Originally Posted by bri1042 View Post
30k miles on a 20? Wow.
Yeah I know.... I drive too much. And it’s not even my daily
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      10-08-2020, 04:37 PM   #160
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Quote:
Originally Posted by Poochie View Post
Hey,

So for "Cold Bulb Checks," the bulbs are switched on by a short current pulse without the bulb being powered up.

"Warm Bulb Checks" while the lights are powered on, the hot monitoring measures the individual power outputs, to assist in detection of any short and open circuits. A faulty incandescent bulb is detected within approx. 2 seconds.

For the record, LEDs are not cold-monitored, as LEDs react too quickly and would light up or strobe, when powered off.
For the record, LEDs are not warn-monitored in that way due to flickering and brightness issues in supplying extra voltage to an illuminated bulb. Other than myself claiming that, the documentation you linked explained that, as well as the "electrical expert" that was replying here.
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      10-10-2020, 12:22 AM   #161
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Picked up a 2019 M2C in 6MT last week, within a day noticed the right rear turn signal malfunction. Took it to the dealer they replaced the whole taillight assembly. They said "because its LED they don't have bulbs, whole light needs to be replaced" ??? lol whatever I'll take a free light.

As an added bonus, whatever tech swapped it must've used a metal flathead to pry out the taillight (why, I have no idea you can pull it by hand once unbolted). Put 2 nice nicks down to the plastic of the bumper right below the taillight. Super noticeable on my HS

Long story short, dealer will be repainting my entire rear bumper for free. In the end it will fix the only other scratch on the car at least. But super annoyed I have to be without my brand new car for a whole week.
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      10-14-2020, 07:01 PM   #162
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So I started getting this issue repeatedly after owning my 18 LCI for just a couple weeks.

I took it to the dealer last weekend to get it looked at, but they claimed they couldn't find the fault code, and I couldn't get the issue to reoccur while at the dealer (figures...). I assumed with as many people reporting this issue and getting taillights replaced that the dealer would have a fix for it, but they're playing dumb instead.

Any suggestions for convincing the dealer to actually do something about it? Are there any dealer implemented solutions that have actually worked permanently? (I refuse to DIY fix an issue that should be covered under warranty, especially if it's electrical).
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      10-15-2020, 09:31 AM   #163
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Yeah, my dealer didn’t do much with it even after me bringing the car in with the warning message still on.
It happened again that evening, but hasn’t returned since.
I’m thinking of turning the warm bulb check off if the issue persists.
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      10-15-2020, 01:59 PM   #164
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Has anyone had this happen on a 2021 yet?
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      10-15-2020, 05:47 PM   #165
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So the dealer replaced my right taillight last week. Stopped for a few days.

Now my left rear has the same thing XD
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      10-16-2020, 10:03 AM   #166
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I've had no issue since they replaced my REM a few weeks ago...just FYI
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      10-16-2020, 08:43 PM   #167
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Quote:
Originally Posted by PrinceCity View Post
My taillight started smoking Wednesday. I was at an intersection waiting to make a left turn with a lot of cars in front of me. Probably waiting for 3-4 minutes because the intersection was busy and the light changed a few times while I was waiting. Then I started smelling something disturbing. I don't have my rear seats installed, so I think that saved me because I could smell it sooner. Car is at the dealership now and they are replacing the tailgate.
Yikes!


I managed to get the error to come on while running an errand in the vicinity of the dealer, so I stopped by and had them look at it again today. I left the car running so the warning wouldn't clear, and the dealer was forced to look at it, at least.

They ended up replacing the tail light. The service manager claimed the tech found a short in the taillight that caused one of the LED elements to flicker and likely tripped the CC message. They're convinced the problem is fixed. Here's to hoping they're right.
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      10-20-2020, 09:41 PM   #168
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Quote:
Originally Posted by PrinceCity View Post
Good to hear it worked out for you and hopefully it stay fixed for you. Not to get you worried but my car had a taillight part replaced a few months ago for this problem and it came back. But from what I read most ppl remains solved after dealership fixed it.

Not so fortunate on my end so far. My car been sitting at dealership for "investigation" for a week and they won't give me a damn loaner car and I get pushed aside when I try to ask questions about it. I'm at their mercy though cause they're the only dealership near me. But I have faith it'll get worked out and covered under warranty just like yours did. Thankfully I'm working from home, but I still gotta ask friends for rides to stores and the doctor.
You seem to be conveniently forgetting this...

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      10-20-2020, 09:43 PM   #169
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Quote:
Originally Posted by PrinceCity View Post
My taillight started smoking Wednesday. I was at an intersection waiting to make a left turn with a lot of cars in front of me. Probably waiting for 3-4 minutes because the intersection was busy and the light changed a few times while I was waiting. Then I started smelling something disturbing. I don't have my rear seats installed, so I think that saved me because I could smell it sooner. Car is at the dealership now and they are replacing the tailgate.
What happened is literally the exact thing I warned people about... smh.
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      10-20-2020, 09:50 PM   #170
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Quote:
Originally Posted by Anthony1s View Post
Quote:
Originally Posted by PrinceCity View Post
My taillight started smoking Wednesday. I was at an intersection waiting to make a left turn with a lot of cars in front of me. Probably waiting for 3-4 minutes because the intersection was busy and the light changed a few times while I was waiting. Then I started smelling something disturbing. I don't have my rear seats installed, so I think that saved me because I could smell it sooner. Car is at the dealership now and they are replacing the tailgate.
What happened is literally the exact thing I warned people about... smh.
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      10-21-2020, 11:36 AM   #171
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After reading about PrinceCity’s issue with the tail light smoking, I decided to let the dealer work on it instead of disabling the bulb check.
Hopefully they replace the unit.
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      10-21-2020, 11:49 PM   #172
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Quote:
Originally Posted by Al Bundy's Dodge View Post
I've had no issue since they replaced my REM a few weeks ago...just FYI
Hmm...may have jinxed it. If nothing else a new twist:

Was changing lanes on the highway and used the left indicator. Immediate rapid flash. But no warning or error came up on the Idrive. This is about 3 weeks after the dealer replaced the REM.
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      10-22-2020, 09:11 AM   #173
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Dealer ordered a replacement light for mine.
Hoping the issue goes away.
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      10-23-2020, 02:43 PM   #174
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i just got this issue with my left turn blinker this morning. by the time i got home, it went away. should i just hold off to see if it happens again or do you guys think i should contact the dealership about it?
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      10-24-2020, 01:58 PM   #175
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Quote:
Originally Posted by somberlaine View Post
i just got this issue with my left turn blinker this morning. by the time i got home, it went away. should i just hold off to see if it happens again or do you guys think i should contact the dealership about it?
My direction is to contact the dealership, because the more people who do the more likely BMW will find a solution to this.
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      10-24-2020, 02:16 PM   #176
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I had the error come back, after having a bunch of stuff replaced at the dealership two months ago. Here is a link to my service record of everything that was done.

https://f87.bimmerpost.com/forums/sh...&postcount=222

I contacted my dealership and they will be looking at my car on Monday. When I was there, there was another guy (with a regular 2-series) having the same problem. I spoke with him and explained everything I know and the thoughts from this thread. With that, my dealership now sees for themselves that it's not just me with the issue. So it's not just me they have to deal with anymore, which should help get things resolved.

I'm bowing out of investigating the cause of the error myself. I don't have the technical experience to diagnose it, nor do I have the time to gain that experience or mental capacity to debate theories right now. So much other things going on in my life that I have to focus on. I'm still working with my dealership and telling them everything I know, but other than that I am putting it in their hands to figure out a solution.

*For those who have had the issue come back, how long after the repair did you see it come up again?
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