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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 10-17-2009, 06:38 AM
6spdg37s 6spdg37s is offline
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Turn signal error

so i got my CPO 750Li the other day. now it randomly says right turn signal malfunction and then it clears itself. randomly at random times. has this happened to anyone before? im pretty upset.
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  #2  
Old 10-17-2009, 08:51 AM
zaleonardz zaleonardz is offline
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Check the bulbs, most likely cause.
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  #3  
Old 10-17-2009, 08:22 PM
Keif Keif is offline
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Loose bulb or bulb socket contacts?
 
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  #4  
Old 10-17-2009, 09:30 PM
6spdg37s 6spdg37s is offline
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yea thats what i figured it was... i went back to the dealership and service disconnected and reconnected all the right turn signals and it has not happened since then. they said that was most likely the problem
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  #5  
Old 10-18-2009, 05:01 AM
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BobSC BobSC is offline
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Quote:
Originally Posted by 6spdg37s View Post
yea thats what i figured it was... i went back to the dealership and service disconnected and reconnected all the right turn signals and it has not happened since then. they said that was most likely the problem
Sounds like the loose bulb or connection was the problem!
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  #6  
Old 10-18-2009, 04:12 PM
6spdg37s 6spdg37s is offline
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ok so it started happening again then i played a little self diagnosis with myself. i drove 10 miles in circles only making right turns.. heres what ive narrowed it down too..IT only happens when the headlights are on auto not on manually. it only happens when the turn signal point (that it passes when teh wheel turns to snap it off) is crossed and the blinker starts blinking fast like there is a bulb out. this is really odd... im going to give service another call tommorow.
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  #7  
Old 10-19-2009, 07:12 AM
6spdg37s 6spdg37s is offline
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bumppp! anyone have any idea why it is doing this?
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  #8  
Old 11-08-2009, 02:38 PM
hotrod2448 hotrod2448 is offline
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I actually have a similar situation going on here. I'm not sure about the auto setting but, it does only happen when using the left turn signal and once the wheel goes past the self turn off point it blinks really fast and throws a warning. I've changed the bulbs and checked the sockets with no effect.

Is there a flasher relay in the system somewhere?

Last edited by hotrod2448; 11-08-2009 at 06:28 PM.
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  #9  
Old 11-08-2009, 02:47 PM
6spdg37s 6spdg37s is offline
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^ I would assume that there is a turn signal relay located somewhere in the car. However, I am not sure where. Mine went away when they swapped out the faulty socket. Did you check all the sockets, front rear and side?
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  #10  
Old 11-08-2009, 06:28 PM
hotrod2448 hotrod2448 is offline
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It says left front fault when it triggers so, I've only checked the fronts. I had it all apart this morning going through it and I could see some heat discoloration on the contacts but, they didn't look bad. I touched them up with some emery cloth and then checked the resistance through them hoping that would solve the issue if it wasn't the bulbs. I guess I'll just have to go to the dealership and pickup some new ones.

I was very surprised to see that the car doesn't log the fault in the ECU. I checked it using the BavTech tool and there was no log of it.

Thanks.
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  #11  
Old 11-08-2009, 06:53 PM
6spdg37s 6spdg37s is offline
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yea probably because it is not a serious issue? well the Tech said thats how mine looked discolored and sort of burnt as if there was a short in the socket and it was the front i beleive.
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  #12  
Old 11-09-2009, 04:21 AM
hotrod2448 hotrod2448 is offline
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Yeah, I don't understand why they log the things they log and don't do it on others. When I pulled everything up I could see a low brake fluid warning (from when they flushed the system I think) and some front parking sensor warnings from when I checked the angel eyes without the bumper on but, nothing for the turn signal or parking lamp (angel eye burned out). The brake fluid I can see but why log the parking sensor and not lights?

The thing that really pisses me off was this car has only been to dealerships for work till this point. I climbed under the car to change the oil a week or two ago and half the bolts for the under tray are missing, the rest are finger tight, where it all clips together with other plastic parts is not properly put together. Pulled the bumper to replace the angel eye and the LF headlight washer hose wasn't connected from a previous bulb change the dealership did. It really makes me wonder what else they've half-assed along the way and are these cars really that unreliable or are there just a bunch of techs who don't do the work properly.

Oh, well looks like I'll be pulling the bumper again this week. Third times a charm right?
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  #13  
Old 11-09-2009, 05:30 AM
6spdg37s 6spdg37s is offline
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yea I agree it does make you wonder sometimes. I do all my own work on my streetbike, I know if i tighten something or if i dont. Dont wanna be ridin down the road when my sprocket decides to fly off cause the dealer tech didnt torque it down lol
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  #14  
Old 11-16-2009, 06:45 AM
6spdg37s 6spdg37s is offline
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soo my turn signal error is back. i just emailed my dealer. pretty pissed off
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  #15  
Old 11-16-2009, 09:51 AM
hotrod2448 hotrod2448 is offline
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Mine has never gone. I finally got it to act up somewhere that I could see which bulb went out when it triggered the error. It's the out board LF turn signal.

I figured I'd be safe and replace both sockets since I already did the bulbs. Called the dealer and of course they only have one in stock. So, I go pick that one up and change out the one I thought was the problem. Sure enough the issue is still there.

So here is my next question, how does the system work? Does it have a given resistance range that it knows is good? Do we know what that resistance is? I'm about ready to go buy some LED's and string together some resistors.
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  #16  
Old 11-16-2009, 06:10 PM
hotrod2448 hotrod2448 is offline
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I'm pretty well irritated with this now. I've replaced all the bulbs, one socket (cause that's all that the dealerships within an hour drive around had; waiting on more), the bulbs in the fenders, checked resistance through the sockets, moved the left bulbs and sockets to the right side of the car and vice versa and the damn thing still says "LF turn signal malfunction" almost every time you use it.

I thought the parts guy was crazy when he said it was probably the headlight but, now I'm starting to believe he was right.
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  #17  
Old 11-16-2009, 07:43 PM
Keif Keif is offline
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Hotrod, do you have ALC (adaptive headlight control / headlights move when you turn)? If you don't have a wiring diagram I can let you know which pins to test (in case you want to put power to the lights by hand and troubleshoot).
 
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  #18  
Old 11-17-2009, 04:16 AM
hotrod2448 hotrod2448 is offline
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I do have ALC. I would appreciate it if you could give me the pin out on the headlight. At least then I could check resistance through the housing to see if there is anything weird going on there. Thanks.

Either way it's probably going to the dealership most likely though. I feel I've covered my bases enough to not be a "maintenance" item and what ever the resolution is should be covered under the CPO warranty since it is more then a bulb or socket obviously.
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  #19  
Old 11-17-2009, 04:19 AM
6spdg37s 6spdg37s is offline
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Well HOTROD im right there with you pretty much fuming. I called the dealership, I have an appointment to drop it off tonight. Of course they dont have a loaner car for me so either someone from the dealership is driving me home (like 5 mins away) or my friend is giving me a ride. I am upset though because its something so stupid, but it bothers me so much and the fact taht it is a CPO this should not be happening. I also have 300 dollars worth of HID's sitting in my living room that I want to install but would like this problem to first be resolved. !!
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  #20  
Old 11-17-2009, 06:43 AM
hotrod2448 hotrod2448 is offline
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I spoke to my SA today and he feels it most likely the headlight assembly since the issue persists on the left side regardless of the bulb/socket situation. I'm taking down there monday. Luckily I have the email chain from August when this started and the car was still under the original warranty but, the turn signal worked in the shop so they never looked into it. I'm hoping that helps them to just make the issue go away.

Now, I guess I'll put the old bulbs back in since I replaced them with invisilites and MTEC's after I started chasing the turn signal issue.

Good luck G37.
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  #21  
Old 11-17-2009, 07:35 AM
6spdg37s 6spdg37s is offline
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^ thanks same for you. I will let you know what the outcome is. To be honest, I am thinking there is water somehow getting in the housing resulting in the contacts burning and causing the system to replicate a short, or in fact it is causing a short.
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  #22  
Old 11-18-2009, 05:22 AM
Keif Keif is offline
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You may have to do a little investigation on your own because my current wiring diagrams are from 08/2005, but these are what I was able to dig up on the LM2 light module with ALC/AHL (adaptive headlight control / directional headlights). Let me know if your wiring harness looks different in any way. This is for the big 8-pin connector on the headlight assembly (connector X130 on the wiring diagram). Of particular interest would be positive pins 5 and 6, and negative pins 1 and 7.


From WDS:



 
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Black 2007 Alpina B7
Tension strut bushings
 
White 2007 Alpina B7
Supercharger clutch/bearings, replaced exhaust valve/pulled head, sunroof seal, 6000K angel eyes
 
Black 2002 BMW 745Li (sold)
KW v3's, blue angel eyes, 8000K headlights & HID fogs, rebuilt alternator & mounting bracket gasket, sunroof seal, CCVs, plugs, sway bar bushings, timing & valve cover gaskets, valve stem seals, guibo joint, mechatronic sealing sleeve, trans fluid, sanded headlights...
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  #23  
Old 11-18-2009, 06:53 AM
hotrod2448 hotrod2448 is offline
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Thanks Keif. Where did you get that if you don't mind me asking? Do you have a service "manual"? I've seen them on Ebay for $10 bucks but, haven't gotten around to getting one yet.
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  #24  
Old 11-18-2009, 02:57 PM
Keif Keif is offline
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BMW's WDS (wiring diagram system) -- the version I have is kind of old though (as I mentioned, 08/2005). I should hopefully have a newer one later. You can also pay $30 for a day pass at BMWTechInfo.com or BMWTIS.com and get immediate access to the most recent wiring diagram system / WDS.
 
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Black 2007 Alpina B7
Tension strut bushings
 
White 2007 Alpina B7
Supercharger clutch/bearings, replaced exhaust valve/pulled head, sunroof seal, 6000K angel eyes
 
Black 2002 BMW 745Li (sold)
KW v3's, blue angel eyes, 8000K headlights & HID fogs, rebuilt alternator & mounting bracket gasket, sunroof seal, CCVs, plugs, sway bar bushings, timing & valve cover gaskets, valve stem seals, guibo joint, mechatronic sealing sleeve, trans fluid, sanded headlights...
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  #25  
Old 11-18-2009, 05:34 PM
hotrod2448 hotrod2448 is offline
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Cool. Good info to know. Thanks.
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