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View Poll Results: Have your M2C rear indicator units failed?
Yes 135 63.68%
No 77 36.32%
Voters: 212. You may not vote on this poll

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      03-19-2020, 02:54 PM   #23
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Wtf, I just realized, they had a stop sale on my car when I bought it because of this. I bought it off the lot and it had 124 miles, and I guess this had shown up already.
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      03-19-2020, 03:40 PM   #24
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Quote:
Originally Posted by andrewc89 View Post
It's interesting because if you've retrofitted LCI tail lights on a PreLCI this doesn't seem to be an issue
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because BMW left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.

BTW, I to have a pre-LCI with LED taillights and never received a turn signal error but I did double up on two separate ground polarity wires, just for good measure.


https://www.newtis.info/tisv2/a/en/f...outer/4LACTpNd
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      03-19-2020, 04:02 PM   #25
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Quote:
Originally Posted by Poochie View Post
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.
Lol so in theory this issue could be solved by just coding out the bulb checks? Seems like a much easier solution.
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      03-19-2020, 04:06 PM   #26
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Quote:
Originally Posted by andrewc89 View Post
Quote:
Originally Posted by Poochie View Post
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.
Lol so in theory this issue could be solved by just coding out the bulb checks? Seems like a much easier solution.
I really believe so..

I mean, there must be a logical explanation for this fault but I'm merely just a guy making an educated guess based on the facts and it won't cost anything to give it a shot, if you already paid for the Bimmercode APP.

I hope I win a prize if I'm right..
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      03-19-2020, 04:12 PM   #27
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Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by andrewc89 View Post
Quote:
Originally Posted by Poochie View Post
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.
Lol so in theory this issue could be solved by just coding out the bulb checks? Seems like a much easier solution.
I really believe so..

I mean, there must be a logical explanation for this fault but I'm merely just a guy making an educated guess based on the facts and it won't cost anything to give it a shot, if you already paid for the Bimmercode APP.

I hope I win a prize if I'm right..
Is the error staying for people? It showed up for me but also disappeared within 20 or so miles and never came back.
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      03-19-2020, 04:21 PM   #28
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Quote:
Originally Posted by m0butt View Post
Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by andrewc89 View Post
Quote:
Originally Posted by Poochie View Post
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.
Lol so in theory this issue could be solved by just coding out the bulb checks? Seems like a much easier solution.
I really believe so..

I mean, there must be a logical explanation for this fault but I'm merely just a guy making an educated guess based on the facts and it won't cost anything to give it a shot, if you already paid for the Bimmercode APP.

I hope I win a prize if I'm right..
Is the error staying for people? It showed up for me but also disappeared within 20 or so miles and never came back.
It occurs intermittently and doesn't leave a trace afterwards.. One if those ghost errors..

One of you guys with a Competition and the Bimmercode APP should verify if the hot bulb check is on for the turn signals..

If it is active, I reckon that's the root cause of your issue..
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      03-19-2020, 05:07 PM   #29
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Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by m0butt View Post
Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by andrewc89 View Post
Quote:
Originally Posted by Poochie View Post
The issue is BMW leaving the "hot" bulb-check on even for LED tail lights..

LED runs on a lower polarity than incandescent, for which the "bulb checks" was originally designed for, so the system is going to assume an error when LEDs are operational, since it's drawing a lower amperage.

I have a sneaking suspicion because left on the hot bulb check (for God knows why : ) for the LED turn signal and the lack of ground is causing the turn signal to assume an error.

Folks that did the LCI taillight swap is going to go by the DIY instructions and code out the hot and cold bulb checks, hence, no rapid flashing turn signal error.
Lol so in theory this issue could be solved by just coding out the bulb checks? Seems like a much easier solution.
I really believe so..

I mean, there must be a logical explanation for this fault but I'm merely just a guy making an educated guess based on the facts and it won't cost anything to give it a shot, if you already paid for the Bimmercode APP.

I hope I win a prize if I'm right..
Is the error staying for people? It showed up for me but also disappeared within 20 or so miles and never came back.
It occurs intermittently and doesn't leave a trace afterwards.. One if those ghost errors..

One of you guys with a Competition and the Bimmercode APP should verify if the hot bulb check is on for the turn signals..

If it is active, I reckon that's the root cause of your issue..
Got you, I'll let you know tonight.
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      03-19-2020, 07:10 PM   #30
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Quote:
Originally Posted by m0butt View Post
Is the error staying for people? It showed up for me but also disappeared within 20 or so miles and never came back.
The error has been intermittent. My dealer was able to get an error code readout on the error. My problem was in the wiring harness and I haven’t had a problem since they fixed the harness.
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      03-20-2020, 11:10 PM   #31
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Just got mine back from the dealer and now the left side is 2x as bad.
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      03-20-2020, 11:58 PM   #32
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Quote:
Originally Posted by LBbluem2 View Post
Just got mine back from the dealer and now the left side is 2x as bad.
Hey, do you have the Bimmercode APP or Esys?

I would like someone with an LCI or Competition to verify the turn signal bulb check parameters..
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      03-21-2020, 12:03 AM   #33
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Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by LBbluem2 View Post
Just got mine back from the dealer and now the left side is 2x as bad.
Hey, do you have the Bimmercode APP or Esys?

I would like someone with an LCI to Competition to verify the turn signal bulb check parameters..
Yes I do, I'll give it a shot tomorrow morning.
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      04-06-2020, 02:23 PM   #34
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Just inactivated the brake light warm monitoring for my 2019 M2C. Will see how this goes in the next few weeks.
Funny thing is that I noticed light warm monitoring is disabled for all other lights while the brake light is the only one comes with it active...
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      04-06-2020, 02:32 PM   #35
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Quote:
Originally Posted by lengrenjt View Post
Just inactivated the brake light warm monitoring for my 2019 M2C. Will see how this goes in the next few weeks.
Funny thing is that I noticed light warm monitoring is disabled for all other lights while the brake light is the only one comes with it active...
Did you manage to check the warm check for the turn signals?

I believe It's listed under "blinken"..

I'm like 90% sure that specifically removing the warm check for the turn signals will eliminate any potential errors.
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      04-06-2020, 03:25 PM   #36
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Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by lengrenjt View Post
Just inactivated the brake light warm monitoring for my 2019 M2C. Will see how this goes in the next few weeks.
Funny thing is that I noticed light warm monitoring is disabled for all other lights while the brake light is the only one comes with it active...
Did you manage to check the warm check for the turn signals?

I believe It's listed under "blinken"..

I'm like 90% sure that specifically removing the warm check for the turn signals will eliminate any potential errors.
Mine says "not active".
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      04-06-2020, 03:30 PM   #37
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Quote:
Originally Posted by lengrenjt View Post
Quote:
Originally Posted by Poochie View Post
Quote:
Originally Posted by lengrenjt View Post
Just inactivated the brake light warm monitoring for my 2019 M2C. Will see how this goes in the next few weeks.
Funny thing is that I noticed light warm monitoring is disabled for all other lights while the brake light is the only one comes with it active...
Did you manage to check the warm check for the turn signals?

I believe It's listed under "blinken"..

I'm like 90% sure that specifically removing the warm check for the turn signals will eliminate any potential errors.
Mine says "not active".
Great, thanks for checking.

That's odd, that the technical manual states that it's in an "active" state for LEDs, which led to my speculation..

I guess my theory on the error just went out the window...
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      04-06-2020, 06:24 PM   #38
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Have we pinned down which cars are affected?

Mine is a MY2020 with Production Start Date of 3/9/2019

To be clear, I have NOT experienced this issue.
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      04-06-2020, 08:32 PM   #39
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Originally Posted by M2C89 View Post
Have we pinned down which cars are affected?

Mine is a MY2020 with Production Start Date of 3/9/2019

To be clear, I have NOT experienced this issue.
Not all M2s have this problem. It first showed up on the LCI M2 but also was seen on 3 and 4 series LCI cars. There is a service bulletin on this problem but I don’t think any customer has seen it. My M2 had the problem and it was determined to be a wiring harness problem. I haven’t had a problem since they fixed it. Supposedly the bulletin said to look at the wiring harness first.
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      04-06-2020, 09:32 PM   #40
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Quote:
Originally Posted by DanG View Post
Quote:
Originally Posted by M2C89 View Post
Have we pinned down which cars are affected?

Mine is a MY2020 with Production Start Date of 3/9/2019

To be clear, I have NOT experienced this issue.
Not all M2s have this problem. It first showed up on the LCI M2 but also was seen on 3 and 4 series LCI cars. There is a service bulletin on this problem but I don't think any customer has seen it. My M2 had the problem and it was determined to be a wiring harness problem. I haven't had a problem since they fixed it. Supposedly the bulletin said to look at the wiring harness first.
The service bulletin only applies to the Pre-LCI, there is none for the LCI LED taillights.

I had someone check, nothing..


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      07-16-2020, 01:19 PM   #41
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Rear turn indicator failure

A quick update, it's been more than 3 months after I inactivated the brake light warm monitoring. Magically the rear turn indicator hasn't failed not even for once.
I'm not sure if this has permanently solved the issue but so far looks like it works out.
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      07-16-2020, 03:08 PM   #42
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Anyone had this problem with the 2020 car? I know the 2019 and the 2020 had different taillights, but I wonder if they swapped out more than just the lenses?
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      07-16-2020, 03:28 PM   #43
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Quote:
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Anyone had this problem with the 2020 car? I know the 2019 and the 2020 had different taillights, but I wonder if they swapped out more than just the lenses?
Only the exterior of the taillights was altered for the 2020 MY, as in a darker light diffuser (ruby red lens)..

The root cause of this rapid flashing issue was not addressed..
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      07-16-2020, 03:48 PM   #44
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And I voted "no" initially, but am now periodically having this issue. Sigh.
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