LEFT DRL LED (UU) flickering on Parking Light function.

[Rick86]

Rick: OK - I think you should keep trying - it sounds like a Lasttyp setting issue

I just re-read your original post. Am I correct in assuming that when you said "have bought some aftermarket led DRL headlights (GTi style)" you mean that the headlights are LED - in particular is the Low beam LED?

If you just changed the DRLs to LEDs, then my suggested changes won't work because the low beams are still incandescent

Another thing to try is to revert my previous suggested changes and to alter the Lasttyp setting on the DRLs

Leuchte5 TFL RB32-Lasttyp 5 and Leuchte4TFL LB4-Lasttyp 4 > change from 9 - allgemeine Glühlampe 27W; auch H15 to 1 - LED Tagfahrlichtmodul Versorgung

Don

Hi Don,

Thanks for getting back to me.

The original headlamps are completely Incandescent.

My Chinese (more likely "R" Style as have swiping led indicators) headlamps have 3 H7 Incandescent bulbs, one is main beam, one is low beam and the other is a "dummy" cornering bulb. The DRL hoops and indicators are both LED.

I shall try as you suggested a bit later on.....I'm feeling confident about this new change to have suggested.

If you give me your PayPal email I want to send you a donation for your help so far bud! ��

Cheers,

Rick

[Rick86]

Don I found the debug file.

Everything has been reset to how it was before I started so unsure what the issue is.

Thanks,

Rick

[Rick86]

Rick: sounds like you have missed a step in your reversion process! Have you checked the Adplog.CSV file to make sure that ALL the steps were reverted?

Not sure if you are aware, but VCDS keeps a record of ALL the changes that you make in a file called Adplog.CSV (for changes to adapation channels) in the directory C:\Ross-Tech\ VCDS\Debug.

Open this file using something like MS Excel and you will see a list of changes that made. Or post the file somewhere where I can download it and place a link on this forum

Don

Don,

It appears that the low beams never came on in position 0, auto or sidelight.

I have 100% reverted all changes I made via VCDS.

However I have found that adjusting leuchte3SL VRB21 - DIMMWERT CD 3 from 0 to 100 fixed the dimming LED issue....both "hoops" stay fully illuminated now.

So.........my issue now is how do I get the low beam/parking light bulb to come on as it should?

Or am I being thick here.......is the low beam/parking light bulb not meant to come on? Do the DRLs act as the low beam on these style lamps?

Thanks,

Rick

[DV52]

Rick: Well done!!

As to your question about the "Low beam/Parking light" - the standard arrangement for Rest of World (RoW) model mk7s that are fitted with incandescent headlight assemblies is for the DRL/Parking light bulb to be not-illuminated when the Low-beam lights are switched-on. This happens in mk7s that are sold down here but it also happens in the BCM adaptation maps that I have in my database for a few UK mk7s with factory fitted incandescent DRLs.

The reason for this behavior is that the reflector in the DRL cavity (it's called the "luminaire") in incandescent headlight fittings does not have the correct cut-off characteristics for night-time driving. So, if incandescent DRLs were illuminated at night - they would blind the driver in on-coming vehicles (especially if the illumination level of the DRL was high).

However, whilst I'm more than happy that you have fixed the flicker problem, I'm a bit confused by the method that you have used (I don't intend any offense in saying this).

As I have said in my previous suggestion, the standard Leuchte-sets for factory fitted incandescent DRLs is:
Leuchte5 TFL RB32 (right-side) and Leuchte4TFL LB4 (left-side)

The Leuchte-set that you have used to fix the problem is Leuchte3SL VRB21. This Leuchte-set is also used in factory fitted DRL assemblies by VW, but the Leuchte-set is normally only activated when the car is factory fitted with "angel-eyes" (i.e. the "U" shaped lights inside the headlight assembly) which have LED lamps. This Leuchte-set is normally not activated in the BCM for standard incandescent headlight cars.

The other odd aspect of your fix is that Leuchte3SL VRB21 normally only controls the right-side angel-eye and you haven't made the same change to the left-side angel-eye Leuchte-set (which is Leuchte2SL VLB10 for angel-eye fittings). All a bit confusing - but if the fix works on your car, then it's all that's needed

Anyhow, as to how to change the Low-beam behavior of the DRL, the Leuchte-command that determines that the DRL will turn-off when the low-beams are switched-on is Standlicht vorn (Positionslicht; Begrenzungslicht). You could look through the active Leuchte-set for your retrofitted LED DRLs for this command and change it to Standlicht allgemein (Schlusslicht; Positionslicht; Begrenzungslicht). This should be done for the Leuchte-sets for both sides of the car (whatever these Leuchte-sets are on your vehicle)

Don

[Rick86]

Rick: Well done!!

As to your question about the "Low beam/Parking light" - the standard arrangement for Rest of World (RoW) model mk7s that are fitted with incandescent headlight assemblies is for the DRL/Parking light bulb to be not-illuminated when the Low-beam lights are switched-on. This happens in mk7s that are sold down here but it also happens in the BCM adaptation maps that I have in my database for a few UK mk7s with factory fitted incandescent DRLs.

The reason for this behavior is that the reflector in the DRL cavity (it's called the "luminaire") in incandescent headlight fittings does not have the correct cut-off characteristics for night-time driving. So, if incandescent DRLs were illuminated at night - they would blind the driver in on-coming vehicles (especially if the illumination level of the DRL was high).

However, whilst I'm more than happy that you have fixed the flicker problem, I'm a bit confused by the method that you have used (I don't intend any offense in saying this).

As I have said in my previous suggestion, the standard Leuchte-sets for factory fitted incandescent DRLs is:
Leuchte5 TFL RB32 (right-side) and Leuchte4TFL LB4 (left-side)

The Leuchte-set that you have used to fix the problem is Leuchte3SL VRB21. This Leuchte-set is also used in factory fitted DRL assemblies by VW, but the Leuchte-set is normally only activated when the car is factory fitted with "angel-eyes" (i.e. the "U" shaped lights inside the headlight assembly) which have LED lamps. This Leuchte-set is normally not activated in the BCM for standard incandescent headlight cars.

The other odd aspect of your fix is that Leuchte3SL VRB21 normally only controls the right-side angel-eye and you haven't made the same change to the left-side angel-eye Leuchte-set (which is Leuchte2SL VLB10 for angel-eye fittings). All a bit confusing - but if the fix works on your car, then it's all that's needed

Anyhow, as to how to change the Low-beam behavior of the DRL, the Leuchte-command that determines that the DRL will turn-off when the low-beams are switched-on is Standlicht vorn (Positionslicht; Begrenzungslicht). You could look through the active Leuchte-set for your retrofitted LED DRLs for this command and change it to Standlicht allgemein (Schlusslicht; Positionslicht; Begrenzungslicht). This should be done for the Leuchte-sets for both sides of the car (whatever these Leuchte-sets are on your vehicle)

Don

Hi Don,

My headlamps do have the "double u" led drls fitted (just like originals).

Sorry I forgot to mention I also adjusted VLB10 aswell as VRB21.

So everything seems to be working as it should right now....I think?!!

I'm guna run the car Down to have someone verify the lamps are MOT passable.

Thanks for all your help so far DON, your very knowledgeable.

Cheers,

Rick

[Rick86]

Don,

Garage has confirmed my lamps are good!!

Your a legend.

Thanks,

Rick

[Rick86]

Hi Don,

My headlamps do have the "double u" led drls fitted (just like originals).

Sorry I forgot to mention I also adjusted VLB10 aswell as VRB21.

So everything seems to be working as it should right now....I think?!!

I'm guna run the car Down to have someone verify the lamps are MOT passable.

Thanks for all your help so far DON, your very knowledgeable.

Cheers,

Rick

Don,

How do I stop the U shaped led DRLs from dimming once I put the low beam bulbs on?

Thanks,

Rick

[Rick86]

Rick: Well done!!

As to your question about the "Low beam/Parking light" - the standard arrangement for Rest of World (RoW) model mk7s that are fitted with incandescent headlight assemblies is for the DRL/Parking light bulb to be not-illuminated when the Low-beam lights are switched-on. This happens in mk7s that are sold down here but it also happens in the BCM adaptation maps that I have in my database for a few UK mk7s with factory fitted incandescent DRLs.

The reason for this behavior is that the reflector in the DRL cavity (it's called the "luminaire") in incandescent headlight fittings does not have the correct cut-off characteristics for night-time driving. So, if incandescent DRLs were illuminated at night - they would blind the driver in on-coming vehicles (especially if the illumination level of the DRL was high).

However, whilst I'm more than happy that you have fixed the flicker problem, I'm a bit confused by the method that you have used (I don't intend any offense in saying this).

As I have said in my previous suggestion, the standard Leuchte-sets for factory fitted incandescent DRLs is:
Leuchte5 TFL RB32 (right-side) and Leuchte4TFL LB4 (left-side)

The Leuchte-set that you have used to fix the problem is Leuchte3SL VRB21. This Leuchte-set is also used in factory fitted DRL assemblies by VW, but the Leuchte-set is normally only activated when the car is factory fitted with "angel-eyes" (i.e. the "U" shaped lights inside the headlight assembly) which have LED lamps. This Leuchte-set is normally not activated in the BCM for standard incandescent headlight cars.

The other odd aspect of your fix is that Leuchte3SL VRB21 normally only controls the right-side angel-eye and you haven't made the same change to the left-side angel-eye Leuchte-set (which is Leuchte2SL VLB10 for angel-eye fittings). All a bit confusing - but if the fix works on your car, then it's all that's needed

Anyhow, as to how to change the Low-beam behavior of the DRL, the Leuchte-command that determines that the DRL will turn-off when the low-beams are switched-on is Standlicht vorn (Positionslicht; Begrenzungslicht). You could look through the active Leuchte-set for your retrofitted LED DRLs for this command and change it to Standlicht allgemein (Schlusslicht; Positionslicht; Begrenzungslicht). This should be done for the Leuchte-sets for both sides of the car (whatever these Leuchte-sets are on your vehicle)

Don

Don,

I sorted the DRL issue on my last post.

Thanks for all your help bud.

Thanks,

Rick