F31 LCI interior light problem

DaveA · 12-19-2017, 04:59 AM

I still think this is most likely a glitch in the code that (under certain circumstances) causes a "turn light on" code/command to be sent to the light unit... and/or (possibly) a glitch in the LIN...

I really don't think it is hardware related....

teaston · 12-19-2017, 09:32 AM

Quote:

Originally Posted by DaveA

I still think this is most likely a glitch in the code that (under certain circumstances) causes a "turn light on" code/command to be sent to the light unit... and/or (possibly) a glitch in the LIN...

I really don't think it is hardware related....

Yep I think this is most likely.

DaveA · 12-19-2017, 10:05 AM

Quote:

Originally Posted by teaston

Yep I think this is most likely.

Do we know if vehicles that are still being delivered are similarly afflicted..?

teaston · 12-19-2017, 11:03 AM

Quote:

Originally Posted by DaveA

Do we know if vehicles that are still being delivered are similarly afflicted..?

I think there was someone in here with a very recently built car.

daveb666 · 12-20-2017, 02:03 AM

Quote:

Originally Posted by teaston

I think there was someone in here with a very recently built car.

Mines is a March 17 LCI, has the issue.

NanasBack · 12-20-2017, 11:45 AM

Mine is March 17. LCI.
It did do it but I think it has stopped.
Not seen it for a while.

RoShambolt · 12-21-2017, 05:13 PM

March 17, doing it. Did it today when I put on adaptive cruise for long slow moving traffic on a bottle neck road. Never got over 20 so it's not speed related.

rosstin · 12-21-2017, 05:40 PM

I seem to get this more often in heavy traffic, so when the ACC is having to make more brake interventions. Also only seems to be the left side light on mine

daveb666 · 12-22-2017, 05:51 AM

Worst in heavy traffic, it's something to do with the brake signal to the rear.

Annoyingly since my rear light unit was replaced mine now also comes on when the ACC isn't active.

My email went to BMw today, and was cc'd to Watchdog.

teaston · 12-22-2017, 07:48 AM

Quote:

Originally Posted by daveb666

Worst in heavy traffic, it's something to do with the brake signal to the rear.

Annoyingly since my rear light unit was replaced mine now also comes on when the ACC isn't active.

My email went to BMw today, and was cc'd to Watchdog.

You could be on to something there, I wonder if the rear interior light is controlled by the REM (same control module for the taillights).

NanasBack · 12-23-2017, 11:52 AM

Good point!
Maybe it is speed related.
I've not used ACC in town traffic recently, where it would be frequently signaling the brake lights to come on.
Only used in motorway conditions where slowing down probably didn't use the brakes at all.
So if the signal to bring the brake lights on is sometimes interpreted by the interior light it should come on?

daveb666 · 12-24-2017, 10:07 AM

Something like that. The dealer told me that when plugged into the computer the car indicates a rear light daily due to a voltage drop.

The implication being the fault is with the rear light unit itself as opposed to any coding however.

willoughbyceh · 12-31-2017, 02:41 AM

It appears there is still no solution. I am told there is a part coming in Jan but I won’t hold my breath!

BMW seem to have an issue finding the true fault as I have had two modified units and both have failed...

daveb666 · 01-03-2018, 08:28 AM

Got a reply confirming there is no resolution to the problem and no timeline in place either.

Asked for the procedure to raise a formal complaint but told there is no facility to do that.

My light now comes on,alot,even without ACC active.

This is just ridiculous, a £40k car that has a faulty light and no prospect of a solution or a dealer/manufacturer that seems to care.

teaston · 01-03-2018, 08:46 AM

Quote:

Originally Posted by daveb666

Got a reply confirming there is no resolution to the problem and no timeline in place either.

Asked for the procedure to raise a formal complaint but told there is no facility to do that.

My light now comes on,alot,even without ACC active.

This is just ridiculous, a £40k car that has a faulty light and no prospect of a solution or a dealer/manufacturer that seems to care.

Bloody ridiculous

TimMcC · 01-03-2018, 08:49 AM

Has anyone contacted Watchdog?

Edit: I see daveb666 has done just that. Should we all do the same?

Drek · 01-03-2018, 12:23 PM

To be honest I've learnt to live with it, as irritating as it is. A quick press of the main light switch to turn them off saves my annoyance reaching silly levels. Still shouldn't be happening though.

Drek · 01-06-2018, 04:14 PM

I've just done a round trip to Scotland of about 900 miles(ish), majority of it using ACC. On the way up it came on once and on the way back not even a flicker.

teaston · 01-07-2018, 05:20 PM

Quote:

Originally Posted by Drek

I've just done a round trip to Scotland of about 900 miles(ish), majority of it using ACC. On the way up it came on once and on the way back not even a flicker.

This is odd, today I drove from London to Norwich and mine also didn’t come on once! Probably coincidence, but still strange nonetheless!

daveb666 · 01-09-2018, 02:53 AM

I used ACC once yesterday and it came on within 2 minutes

You two must just be lucky 😝

willoughbyceh · 02-03-2018, 04:51 AM

Got it fixed! Or at least I think so!!! New part arrived and was fitted so there is hope that it will now solve the problem after the first two sets of dud units.

Tengocity · 02-03-2018, 05:28 AM

Quote:

Originally Posted by willoughbyceh

Got it fixed! Or at least I think so!!! New part arrived and was fitted so there is hope that it will now solve the problem after the first two sets of dud units.

Good news... though we've been here before!

What was the part?

12-19-2017, 04:59 AM	#287
DaveA Brigadier General 1922 Rep 3,489 Posts Drives: BMW M135i xDrive Join Date: May 2013 Location: Teesside iTrader: (0)	I still think this is most likely a glitch in the code that (under certain circumstances) causes a "turn light on" code/command to be sent to the light unit... and/or (possibly) a glitch in the LIN... I really don't think it is hardware related.... __________________ CAR HISTORY - Golf GTI 245 - F30 340i M Sport - F30 330d M Sport MPPK - F30 320d Sport - 997 Gen2 GT3 - 987 Cayman S - 986 Boxster S - Ibiza Cupra - Polo 16v - E30 M3 (Official GB import) - Integra 16v - Mk2 Polo S - Mk1 Golf C Last edited by DaveA; 12-19-2017 at 05:05 AM..
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12-20-2017, 11:45 AM	#292
NanasBack Lieutenant 206 Rep 552 Posts Drives: EB 335 oil burner Join Date: Aug 2017 Location: Staffs, UK iTrader: (0)	Mine is March 17. LCI. It did do it but I think it has stopped. Not seen it for a while.
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12-21-2017, 05:13 PM	#293
RoShambolt Captain 338 Rep 725 Posts Drives: Looking Join Date: Nov 2016 Location: Beds iTrader: (0)	March 17, doing it. Did it today when I put on adaptive cruise for long slow moving traffic on a bottle neck road. Never got over 20 so it's not speed related.
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12-21-2017, 05:40 PM	#294
rosstin Captain 325 Rep 664 Posts Drives: 340i saloon Join Date: Oct 2016 Location: London iTrader: (0)	I seem to get this more often in heavy traffic, so when the ACC is having to make more brake interventions. Also only seems to be the left side light on mine
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12-22-2017, 05:51 AM	#295
daveb666 Private 23 Rep 68 Posts Drives: F31 Tourer Join Date: Feb 2017 Location: UK iTrader: (0)	Worst in heavy traffic, it's something to do with the brake signal to the rear. Annoyingly since my rear light unit was replaced mine now also comes on when the ACC isn't active. My email went to BMw today, and was cc'd to Watchdog.
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12-23-2017, 11:52 AM	#297
NanasBack Lieutenant 206 Rep 552 Posts Drives: EB 335 oil burner Join Date: Aug 2017 Location: Staffs, UK iTrader: (0)	Good point! Maybe it is speed related. I've not used ACC in town traffic recently, where it would be frequently signaling the brake lights to come on. Only used in motorway conditions where slowing down probably didn't use the brakes at all. So if the signal to bring the brake lights on is sometimes interpreted by the interior light it should come on?
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12-24-2017, 10:07 AM	#298
daveb666 Private 23 Rep 68 Posts Drives: F31 Tourer Join Date: Feb 2017 Location: UK iTrader: (0)	Something like that. The dealer told me that when plugged into the computer the car indicates a rear light daily due to a voltage drop. The implication being the fault is with the rear light unit itself as opposed to any coding however.
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12-31-2017, 02:41 AM	#299
willoughbyceh Enlisted Member 15 Rep 31 Posts Drives: 2010 e91 330d Titanium Silver Join Date: Apr 2012 Location: UK iTrader: (0)	It appears there is still no solution. I am told there is a part coming in Jan but I won’t hold my breath! BMW seem to have an issue finding the true fault as I have had two modified units and both have failed...
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01-03-2018, 08:28 AM	#300
daveb666 Private 23 Rep 68 Posts Drives: F31 Tourer Join Date: Feb 2017 Location: UK iTrader: (0)	Got a reply confirming there is no resolution to the problem and no timeline in place either. Asked for the procedure to raise a formal complaint but told there is no facility to do that. My light now comes on,alot,even without ACC active. This is just ridiculous, a £40k car that has a faulty light and no prospect of a solution or a dealer/manufacturer that seems to care.
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01-03-2018, 08:49 AM	#302
TimMcC Captain 530 Rep 983 Posts Drives: BMW I01 i3S & Jaguar I-Pace Join Date: Jul 2014 Location: Hampshire iTrader: (0)	Has anyone contacted Watchdog? Edit: I see daveb666 has done just that. Should we all do the same? Last edited by TimMcC; 01-03-2018 at 09:43 AM.. Reason: Didn't spot the answer...
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01-03-2018, 12:23 PM	#303
Drek Major 564 Rep 1,215 Posts Drives: Ferrari F430 F1 Join Date: Jan 2015 Location: West Berkshire iTrader: (0)	To be honest I've learnt to live with it, as irritating as it is. A quick press of the main light switch to turn them off saves my annoyance reaching silly levels. Still shouldn't be happening though. __________________ Ferrari F430 Spider F1 RRS Autobiography 2CV6 Special www.bmwland.org.uk
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01-06-2018, 04:14 PM	#304
Drek Major 564 Rep 1,215 Posts Drives: Ferrari F430 F1 Join Date: Jan 2015 Location: West Berkshire iTrader: (0)	I've just done a round trip to Scotland of about 900 miles(ish), majority of it using ACC. On the way up it came on once and on the way back not even a flicker. __________________ Ferrari F430 Spider F1 RRS Autobiography 2CV6 Special www.bmwland.org.uk
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01-09-2018, 02:53 AM	#306
daveb666 Private 23 Rep 68 Posts Drives: F31 Tourer Join Date: Feb 2017 Location: UK iTrader: (0)	I used ACC once yesterday and it came on within 2 minutes You two must just be lucky 😝
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02-03-2018, 04:51 AM	#307
willoughbyceh Enlisted Member 15 Rep 31 Posts Drives: 2010 e91 330d Titanium Silver Join Date: Apr 2012 Location: UK iTrader: (0)	Got it fixed! Or at least I think so!!! New part arrived and was fitted so there is hope that it will now solve the problem after the first two sets of dud units.
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