[bodtwo]

Been to busy to speak to dealer, but I'll be calling them next wee to get this looked at.

Sounds trivial but becomes very annoying.

[HiBee]

Originally Posted by bodtwo

Ok, new F31 LCI and I've noticed an odd problem with the interior rear passenger lights, the ones on the ceiling by the grab handles.

Every now and again one of them will come on, it might be the left and then next time the right. To turn them off I've been turning all the interior lights on and then off using the button above the driver.

It's very random and very annoying, the other thing is that it seems to be linked to using ACC and when you come up to a stop behind a car, although that may just be random.

Has anyone had interior lights randomly turning themselves on and off?

Thanks all.

No issues at my end, although TBH i've never noticed.
Get it checked out at dealership.

[Daftasabrush]

Originally Posted by teaston

Now I've also got this bloody problem!!

First the rear left reading light, then the rear right later on!

Also using ACC.

Hold on, you don't have a F31!

Loving the fact this virus is spreading though

[teaston]

Originally Posted by Daftasabrush

Hold on, you don't have a F31!

Loving the fact this virus is spreading though

Yep, the lights are in the middle of the roof on F30, so different units by the sounds of it. It's obviously a software problem which thinks the door is open for some reason!

[Daftasabrush]

Originally Posted by teaston

Yep, the lights are in the middle of the roof on F30, so different units by the sounds of it. It's obviously a software problem which thinks the door is open for some reason!

Same as f31s without sunroofs, I don't think it's to do with doors being 'open' though, the lights are brighter with doors open and the dash would complain too.

[teaston]

Originally Posted by Daftasabrush

Same as f31s without sunroofs, I don't think it's to do with doors being 'open' though, the lights are brighter with doors open and the dash would complain too.

My lights come on exactly like that when i open the corresponding door!

I'm not saying the whole system thinks the door is open, just that it's mistakingly sending the message to the light that the door is open.

[Jonathan1822]

Also had this - LCI F31. Noticed when on motorways generally, cannot pin down, but as identified may be ACC. Central roof light comes on, but it down to reaching around to dog in back and catching but looks like it might be electrical/config issue!

[Daftasabrush]

Originally Posted by teaspoon

My lights come on exactly like that when i open the corresponding door!

I'm not saying the whole system thinks the door is open, just that it's mistakingly sending the message to the light that the door is open.

Thing is, computers work with logic, the light comes on with that intensity when you manually switch it on, so the computer is thinking, for some reason, that the switch has been pressed.

This could be due to faulty wiring from the switch to the FEM (or REM, not sure which controls it), incorrect switch resistance (I'd expect there to only be two or three control cables from the light module and the FEM or REM to know which button has been pressed by different resistances being introduced across connectors. A lot of devices like TV remotes etc use similar methods to multiplex signals across much fewer cables than buttons/devices to save on wiring) or the REM or something temperature dependent, or just random coding issues.

I'd expect the door open issue to manifest itself with other problems because the trigger for the light to come on then, isn't a switch that just controls the light, it's a switch that tells the module the door is open which kick starts other things to happen.

Either way, I very much doubt any of us are going to get to the bottom of it, and sadly, I suspect dealers will be just as clueless so it'll need someone who's willing to leave their car with a dealer for a lengthy period of time and then have them drive it for xx miles and look out for it, if it happens. The chances of this happening are slim to none.

[mpawood]

Originally Posted by Drek

That said, I've been away from my car for 5 weeks and won't see it until next week so it'll be interesting to see if it's still going on.

How have you coped?! I'd have made a special trip back to see it, possibly see the wife at the same time, maybe.

[saltyamigo]

Seems a very random fault to be associated with the ACC system, hopefully BMW are aware and a software update sorts it out. I've never had this problem on my LCI but unfortunately I don't have ACC

[Drek]

Just to reiterate, I've had this happen when my ACC has been off so I don't believe that ACC is a causal factor. It may be related but not the root of the problem.

[AlfaM]

Originally Posted by Drek

Just to reiterate, I've had this happen when my ACC has been off so I don't believe that ACC is a causal factor. It may be related but not the root of the problem.

ACC might be off but the hardware software is still there. It seems that everyone who has had an issue also has ACC fitted - whether its running or not.

My light came on during my last 350 mile ACC enabled trip, and it hasn't happened since. I've got another 350 mile trip tomorrow, so i'll report back tomorrow evening.

[teaston]

Mine did it again this morning!

[Drek]

Originally Posted by Moonie

ACC might be off but the hardware software is still there. It seems that everyone who has had an issue also has ACC fitted - whether its running or not.

My light came on during my last 350 mile ACC enabled trip, and it hasn't happened since. I've got another 350 mile trip tomorrow, so i'll report back tomorrow evening.

Um, which was exactly my point! It may be related but I don't believe it's causal.

[flintymutt]

Originally Posted by saltyamigo

Seems a very random fault to be associated with the ACC system, hopefully BMW are aware and a software update sorts it out. I've never had this problem on my LCI but unfortunately I don't have ACC

It's not ACC as they've come on whilst I've been driving without it switched on.

[flintymutt]

Originally Posted by Drek

Just to reiterate, I've had this happen when my ACC has been off so I don't believe that ACC is a causal factor. It may be related but not the root of the problem.

Ditto. I've emailed my dealer to see if there's a BMW wide awareness of this. It's no big issue. Will probably wait until first service to fix it.

[AlfaM]

Originally Posted by Drek

Um, which was exactly my point! It may be related but I don't believe it's causal.

If its related then its causal.

[Drek]

Originally Posted by Moonie

If its related then its causal.

No it isn't, correlation does not mean causation. Any number of factors can influence an action and you can prove this through regression analysis if you want to be really geeky. The mere presence of a factor that may or may not be a significant influence on an outcome does not, in and of itself, make it a causal factor.

[AlfaM]

Originally Posted by Drek

No it isn't, correlation does not mean causation. Any number of factors can influence an action and you can prove this through regression analysis if you want to be really geeky. The mere presence of a factor that may or may not be a significant influence on an outcome does not, in and of itself, make it a causal factor.

Reading this thread it's obvious that cars fitted with ACC hardware (running or not) suffer from 'phantom light syndrome' - a term I've coined.

There are few other factor in play here - I don't believe the age, drinking habits or social class of the driver are playing any part in this.

[Drek]

Originally Posted by Moonie

Reading this thread it's obvious that cars fitted with ACC hardware (running or not) suffer from 'phantom light syndrome' - a term I've coined.

There are few other factor in play here - I don't believe the age, drinking habits or social class of the driver are playing any part in this.

Neither do I so I'm not sure why you've brought them up really.

[TimMcC]

This happened in my F32 today. The wife has mentioned it before and I didn't believe her! My car also has ACC fitted...

[AlfaM]

Originally Posted by Drek

Neither do I so I'm not sure why you've brought them up really.

Does anyone on here not have Aspergers?