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GELCR

Vcds help advise HELP please

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Really struggling with this one 2017 golf r 7.5 I have a fault with the AFS showing a error on the dash, connected vcds and it’s showed 2 faults with the right light (photos attached) low voltage and mechanical failure to motor, which I suspected as it makes a clicking sound when the lights turn on for a few seconds, and another 1 fault in the 4b mulit func module, which states “received an error code” now is this because the module is linked in which because it’s showing the error on my dash it’s showing in the module???
wanted to clarify before I purchase a second hand full headlight light including ballasts 


Last question is once I purchase the new headlight and ballasts modules (x2) will this need coding to my car or will it plug and play with matches per numbers? 
 

thanks in advance for the help really need it

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10 minutes ago, veneeringman said:

If you are changing the Headlight module it’ll need coding to work fully & correctly


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Thanks I was thinking it would need to. Am just slightly confused on why I have the 2 other codes (low voltage and the 4b module fault) now if there only there because of the main motor fault. It all makes sense and I only need to buy a head light and use my old modules of the headlight, hopefully this can be confirmed🤞🏼🤞🏼🤞🏼

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Thanks I was thinking it would need to. Am just slightly confused on why I have the 2 other codes (low voltage and the 4b module fault) now if there only there because of the main motor fault. It all makes sense and I only need to buy a head light and use my old modules of the headlight, hopefully this can be confirmed

You’d also need to run basic settings.


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8 hours ago, GELCR said:

Am just slightly confused on why I have the 2 other codes (low voltage and the 4b module fault) now if there only there because of the main motor fault. It all makes sense and I only need to buy a head light and use my old modules of the headlight, hopefully this can be confirmed🤞🏼🤞🏼🤞🏼

@GELCR: hi and thanks for the PM. First, I assume that the condition of the battery on the car is OK (i.e fully charged and no other symptoms).

 

For low volts fault on hex39 module:

  • If the power supply circuits inside the Light Control Module (LCM) on the right-side are defective, then the positioning motor for the Dynamic Cornering Lights won't have sufficient volts to move correctly - this failure could easily be also interpreted as a defective motor.
  • Or in the alternative, a defect in the motor could result in increased power draw (this is a characteristic of DC motors). The capacity of the power supply in the right-side LCM might not be able to cope with this increased draw ( which is really increased electrical current) - this could easily  result in voltage collapse in the power supply- hence low volts.

For hex 4B module fault:

  • I suspect, your issue might be one of nomenclature; what VCDS calls "4B Multifunc. module" is in reality what VW calls  "J745 Control unit for cornering light and headlight range control" - so entirely proper for a defective LCM to cause a hex4B DTC.

Don

 

 

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6 hours ago, dv52 said:

@GELCR: hi and thanks for the PM. First, I assume that the condition of the battery on the car is OK (i.e fully charged and no other symptoms).

 

For low volts fault on hex39 module:

  • If the power supply circuits inside the Light Control Module (LCM) on the right-side are defective, then the positioning motor for the Dynamic Cornering Lights won't have sufficient volts to move correctly - this failure could easily be also interpreted as a defective motor.
  • Or in the alternative, a defect in the motor could result in increased power draw (this is a characteristic of DC motors). The capacity of the power supply in the right-side LCM might not be able to cope with this increased draw ( which is really increased electrical current) - this could easily  result in voltage collapse in the power supply- hence low volts.

For hex 4B module fault:

  • I suspect, your issue might be one of nomenclature; what VCDS calls "4B Multifunc. module" is in reality what VW calls  "J745 Control unit for cornering light and headlight range control" - so entirely proper for a defective LCM to cause a hex4B DTC.

Don

 

 

Thank you so much for your reply, so this all seems to make sense, it had a service at VW last week and they never showed anything about the battery but I could get this confirmed, the motor you can clearly hear clunking and clicking for a approx 5 seconds when you put the lights on (right side)... the left light does it’s up down/side to side perfectly, But when you clear the codes in either 4b or 39 the motor straight away clicks again right side, I was thinking of purchasing a second hand headlight with both modules included, but I believe this would need coding ? Is the LCM module the one that sits at the very bottom ? Would it straight forward to re code, the fitting of the headlight won’t be a problem. 
thank you again 

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Sorry don another question.... if I was to buy a second hand complete led headlight unit including the modules (x2) from the same spec car (golf r) with same part numberA would this need coding to the car or would it plug and play ? As the new and old lcm would be coded the same am I right in thinking? Thank you again 

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@GELCR The LCM looks like this (sorry about the picture size, but I thieved the image from the web):

162878800_blok-rozjiga-volkswagen-golf-v

hella-8v0907399d-light-control-module-ma

On your auto-scan, If you check the details of the LCM modules @ address hex29 and hex 39 (the faulty unit) - you should find that they have the same part numbers. This means that it should be OK to swap (unplug/re-plug) the right and left side LCMs temporarily to confirm the fault.  If you do this swap  and the module is faulty - this test should  transfer the DTCs to the left side lamp

 

Not sure about your point on "coding". These modules can't be coded with VCDS - check this with VCDS on your car.   LCMs don't  have a long-code string and when you enter adaptation-10 with VCDS, there won't be any adaptation channels in the modules.

 

As to your question about buying the complete headlight fitting - why would you do this?  Do the swap-test that I suggest above and if the fault is confirmed, simply buy a second hand module

 

Don

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6 hours ago, dv52 said:

@GELCR The LCM looks like this (sorry about the picture size, but I thieved the image from the web):

162878800_blok-rozjiga-volkswagen-golf-v

hella-8v0907399d-light-control-module-ma

On your auto-scan, If you check the details of the LCM modules @ address hex29 and hex 39 (the faulty unit) - you should find that they have the same part numbers. This means that it should be OK to swap (unplug/re-plug) the right and left side LCMs temporarily to confirm the fault.  If you do this swap  and the module is faulty - this test should  transfer the DTCs to the left side lamp

 

Not sure about your point on "coding". These modules can't be coded with VCDS - check this with VCDS on your car.   LCMs don't  have a long-code string and when you enter adaptation-10 with VCDS, there won't be any adaptation channels in the modules.

 

As to your question about buying the complete headlight fitting - why would you do this?  Do the swap-test that I suggest above and if the fault is confirmed, simply buy a second hand module

 

Don

I will try this test with LCM, sorry I got abit carried away as I thought with the fault code showing mechanical failure on the motor as well, that it was the headlight and LCM at fault. Will try swapping over and let you know the out come.. thank you again been great help! 

as to the coding part i was under the impression fitting a new headlight (Second Hans) with lcm would need coding to my car.

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@dv52 So just to confirm if it’s the LCM at fault this part doesn’t need coding ? So I can buy a second hand one or brand new one from VW with matching numbers and this will plug and play? Thank you again don you’ve been great help 

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1 hour ago, dv52 said:

yes

Brilliant once again thank you for your help. I will do what you have said.. and do a write up on the fix so people can learn from my problems 

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FIXED LED HEADLIGHT! Just a quick note, LCMs where perfectly working, turned out to be the motor in the headlight that failed (left to right motor) as confirmed by fault code there is 2 motors one is a serviceable item the other isn’t and my wasn’t ☹️... second hand headlight for £298 to my door in brilliant condition, better than the £1700/£2000 quotes I was getting!

no coding was required as I used my old modules, a garage well known for retrofitting did confirm sometimes they do need coding, mine obviously didn’t as they where my originals 

thanks for the help @dv52

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