I'm defeated... Headlight Woes! - BMW M5 Forum and M6 Forums
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post #1 of 14 Old 12th February 2017, 03:30 PM Thread Starter
DaveY
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I'm defeated... Headlight Woes!

As you may already know my car doesn't particularly like me.

I have rebuilt most of the front end of my car due to accident damage and when i started to take it apart the headlights worked fine.
When i put it back together they didn't.

I have had it on 2 OBD diagnostics machines now including taking it to an ex-BMW professional mechanic with the ISTA software etc. Neither of these readings really identified the cause of the fault, only confirmed there was one.

The car is simply showing up 2 faults....

The first is 'Cornering Lights Malfunction'.
The second is 'Dipped Beam Left Failure'.

When my friend put it on his iCarly BMW code reader it came up something to do with ACL Unit fault.

So i've now done some fault finding of my own to see if i can further identify the fault before I get it repaired.

First of all, I swapped the headlights round. The fault carried over with the left headlight.
I thought that narrowed it down to the various electronics on the headlight unit. Apparently not!

I started swapping over the various electrics to wait for the fault to carry over to the right. I switched bulbs first, then the control unit underneath, then the ballast.
Now, when I put the lights back in, the fault doesn't carry over. It remains on the left. All of the parts I am switching between the headlights are apparently working fine on the right side.

With the headlights as they are, either headlight works fine on the right side, but not on the left.

So I checked the fuses. I pulled every single blade fuse out of the car except the massive ones in the glovebox. All were fine.

So now i am literally at a loss.

Can anybody recommend a solution to this problem or at least another diagnostics route before I take it to BMW with the associated £100 per hour fees? I can do almost all the work myself for free if only I knew where this little electrical fault is!

Thanks in advance to all you helpers.

Illustrious car history:
'94 Renault Clio, '86 Peugeot 205, '97 Peugeot 106, '89 Nissan 200SX, '99 Peugeot 306 GTI-6, '01 Citroen Xsara, '07 Ford Mondeo, '06 BMW 335d E92, '06 BMW E60 M5 + Various smaller cc motorbikes over the years!
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post #2 of 14 Old 13th February 2017, 11:52 AM Thread Starter
DaveY
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Does anybody have any ideas on this?

The car is sat on the drive with the front end all removed just waiting to get any ideas on how to fix it before I waste my money and send it off to the garage!

Cheers

Illustrious car history:
'94 Renault Clio, '86 Peugeot 205, '97 Peugeot 106, '89 Nissan 200SX, '99 Peugeot 306 GTI-6, '01 Citroen Xsara, '07 Ford Mondeo, '06 BMW 335d E92, '06 BMW E60 M5 + Various smaller cc motorbikes over the years!
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post #3 of 14 Old 14th February 2017, 04:50 AM
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do you have the codes ofthe faults?
i cannot remember what the cornering lights fault is refering to but i will guess it may be the adaptive corneringlights, which are a left to right stepper motor to angle the light beam with steering wheel rotation. i think my wifes car still has this fault but its ok, lights still work.


dipped beam left means light bulb is burnt out. it may not be burnet out but it may have a high resistance and the electronics are not happy with it and say its burnt out. also unplug your connectors and make sure all pins are clean.

after this you need the actual fault number and then we can see what ista says.
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post #4 of 14 Old 14th February 2017, 02:41 PM Thread Starter
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My friend used his iCarly OBD2 reader/app on his phone and it came up with codes 009cbc and 009cbd.
I'm not sure if they are actual fault codes or just ones generated by the app in it's own language.

Cheers for any help you can give.

Illustrious car history:
'94 Renault Clio, '86 Peugeot 205, '97 Peugeot 106, '89 Nissan 200SX, '99 Peugeot 306 GTI-6, '01 Citroen Xsara, '07 Ford Mondeo, '06 BMW 335d E92, '06 BMW E60 M5 + Various smaller cc motorbikes over the years!
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post #5 of 14 Old 14th February 2017, 02:45 PM Thread Starter
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Also, whilst my friend had it plugged in, he attempted to wipe the fault codes and see if they would come back up, but the codes couldn't be wiped or came back without any hesitation. He has had some success in removing fault codes in the past for me but I think his app isn't exactly perfect to use for this.

Illustrious car history:
'94 Renault Clio, '86 Peugeot 205, '97 Peugeot 106, '89 Nissan 200SX, '99 Peugeot 306 GTI-6, '01 Citroen Xsara, '07 Ford Mondeo, '06 BMW 335d E92, '06 BMW E60 M5 + Various smaller cc motorbikes over the years!
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post #6 of 14 Old 14th February 2017, 04:09 PM
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I find the Carly app to be very iffy at times. It certainly is nothing like they advertise it to be.
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post #7 of 14 Old 14th February 2017, 05:53 PM
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where are you located OP?

Just seen, NI. Scratch that idea!

best I can offer is disconnecting battery for 10 mins.

Last edited by LCM; 14th February 2017 at 05:56 PM.
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post #8 of 14 Old 14th February 2017, 06:20 PM
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Since you did a remove/reinstall perhaps the headlights need readaptation somehow.... maybe have your friend look for a procedure in ISTA/P.
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post #9 of 14 Old 14th February 2017, 07:39 PM Thread Starter
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Quote:
Originally Posted by xrviz View Post
Since you did a remove/reinstall perhaps the headlights need readaptation somehow.... maybe have your friend look for a procedure in ISTA/P.
That wouldn;t account for why either headlight works on the right hand side but not the left surely?

If I remove the battery. Won't it need registering back in? I'm new to this whole registering the battery malarky to be honest. In all my other cars I've had you could just whip the battery out as you want and everything works fine on reinstall.

I'll give it another day or two, see if any ideas come up and then I'll have to bite the bullet and take it in to be looked at I guess.

Thanks for suggestions so far.

Illustrious car history:
'94 Renault Clio, '86 Peugeot 205, '97 Peugeot 106, '89 Nissan 200SX, '99 Peugeot 306 GTI-6, '01 Citroen Xsara, '07 Ford Mondeo, '06 BMW 335d E92, '06 BMW E60 M5 + Various smaller cc motorbikes over the years!
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post #10 of 14 Old 14th February 2017, 08:31 PM
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Quote:
Originally Posted by DaveY View Post
That wouldn;t account for why either headlight works on the right hand side but not the left surely?

If I remove the battery. Won't it need registering back in? I'm new to this whole registering the battery malarky to be honest. In all my other cars I've had you could just whip the battery out as you want and everything works fine on reinstall.

I'll give it another day or two, see if any ideas come up and then I'll have to bite the bullet and take it in to be looked at I guess.

Thanks for suggestions so far.
Well not necessarily, the LCM controls the headlights so it's possible the problem is there.

You only need to register a new battery, not an old one.
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