[GUIDE] How to retrofit LED projectors to T6 H4 headlights on a VW Transporter

[Robert]

to save a longer wait for getting the autoscan on here ...got the faulty bulb warning light on and wanting it off .. all external lights are ok ( LED )

That is actually a very typical issue.
LEDs consume lower wattage compared with factory fit incandescent bulbs and this causes BCM to "think" that the bulb is faulty.

would any internal lamps cause the warning light ?

No.

 

[catfood12]

That is actually a very typical issue.
LEDs consume lower wattage compared with factory fit incandescent bulbs and this causes BCM to "think" that the bulb is faulty.


No.

How does changing the coding on the BCM improve DAB reception? I though the issue with LEDs was spurious RF from the switching regulator in the LED?

Just curious!

 

[Robert]

The feed produced by the BCM to almost all external lighting can be individually configured as a pure DC or PWMed DC.
PWM in this case is an attempt to improve energy efficiency of incandescent bulbs but with LEDs there are some undesired effects.

Basically PWM signals can generate electromagnetic interference (EMI) and radio frequency interference (RFI) due to the rapid switching and sharp edges of the signal transitions. These high-frequency components can cause unintended electromagnetic emissions and potentially interfere with other nearby electronic devices or communication systems.

 

[catfood12]

The feed produced by the BCM to almost all external lighting can be individually configured as a pure DC or PWMed DC.
PWM in this case is an attempt to improve energy efficiency of incandescent bulbs but with LEDs there are some undesired effects.

Basically PWM signals can generate electromagnetic interference (EMI) and radio frequency interference (RFI) due to the rapid switching and sharp edges of the signal transitions. These high-frequency components can cause unintended electromagnetic emissions and potentially interfere with other nearby electronic devices or communication systems.

Oh, I see. It's a PWM feed to the lamp, not just the PWM output of the regulator inside the lamp.... Where's my VCDS....

 

[Andysmee]

Oh, I see. It's a PWM feed to the lamp, not just the PWM output of the regulator inside the lamp.... Where's my VCDS....

But I didn't find it solved my dab reception issue when the led headlights are on, sorry

 

[catfood12]

But I didn't find it solved my dab reception issue when the led headlights are on, sorry

Well this is what I was seeing from the BCM to the LED driving lamps that I'd changed from incandescent, I thought it was noise back from the LED lamp;



I stuck some chokes in line as below...




Which reduced the line noise to this;



So I thought I'd won, although DAB reception wasn't as good as with the incandescent lamps, so I put them back in and sod the LED vanity.

When I get a moment, I'll try the VCDS tweak as per @Robert .

 

[Der55]

That is actually a very typical issue.
LEDs consume lower wattage compared with factory fit incandescent bulbs and this causes BCM to "think" that the bulb is faulty.


No.

following up with more about this, the bulb warning light went out after my rear reversing camera started working ,
maybe be part of the the same circuit for the lights

 

[Mars2]

Does this coding also work for H7?

I have fitted Osram ZTR H7 LED bulb in my H7 light's. For sure I get light on the dash

Kit de 2 Ampoules H7 LED Osram LEDriving® XTR 6000K - 64210DWXTR

Ampoules LED OSRAM H7 XTR LEDriving, Design Allemand très compact, température de couleur 6000K. Ces H7 LED XTR de remplacement constituent une solution économique et facile d'installation. Vendues par paire.

www.ledperf.com

 

[Mars2]

This coding work great with H7. Thank's

My Van VW T6 TSI 4motion had 8F (10001111) in Byte 16 I switch to DO (1101000). Work great.

 

[Bopster]

Need help please....

Bought the van with the bulb management light on, scanned it when at the sellers and it came back with a DRL Left/Right voltage error in ODB11.(simple enough fix so i thought....

Bought some replacement 'Canbus Error Free DRL's', scanned with ODB11 and the scan comes back clear, but bulb light still on, been around the van and all the bulbs are happy.

Canbus Error Free LED DRL's
Osram Cool Blue Intense H4's
Error Free Front Fog LED's

Followed Robert's earlier post via ODB11(as Below) as mine was set to Byte 16 - HEX: 0F - 11110000, but Bulb Light is still on:

Original
(0F)16 = (0000 1111)2
bit 0 = 1 Activation of low beam via pulse width modulation (PWM) active
bit 1 = 1 Activation of fog light via pulse width modulation (PWM) active
bit 2 = 1 Activation of Daytime running lights via pulse width modulation (PWM) active
bit 3 = 1 Activation of High Beam via pulse width modulation (PWM) active
bit 4 = 0 Lamp Diagnostics for Low Beam inactive
bit 5 = 0 Lamp Diagnostics for Rear Fog Light(s) inactive
bit 6 = 0 Lamp Diagnostics for (Separate) Daytime Running Lights (DRL) inactive
bit 7 = 0 Lamp Diagnostics for High Beam inactive

Proposed modification(same description of bits applies to below)
(D0)16 = (1101 0000)2
bit 0 = 0
bit 1 = 0
bit 2 = 0
bit 3 = 0
bit 4 = 1
bit 5 = 0
bit 6 = 1
bit 7 = 1

Please can somebody help, before i break the van down in to bits and throw them in the river?

 

[Bopster]

Need help please....

Bought the van with the bulb management light on, scanned it when at the sellers and it came back with a DRL Left/Right voltage error in ODB11.(simple enough fix so i thought....

Bought some replacement 'Canbus Error Free DRL's', scanned with ODB11 and the scan comes back clear, but bulb light still on, been around the van and all the bulbs are happy.

Canbus Error Free LED DRL's
Osram Cool Blue Intense H4's
Error Free Front Fog LED's

Followed Robert's earlier post via ODB11(as Below) as mine was set to Byte 16 - HEX: 0F - 11110000, but Bulb Light is still on:

Original
(0F)16 = (0000 1111)2
bit 0 = 1 Activation of low beam via pulse width modulation (PWM) active
bit 1 = 1 Activation of fog light via pulse width modulation (PWM) active
bit 2 = 1 Activation of Daytime running lights via pulse width modulation (PWM) active
bit 3 = 1 Activation of High Beam via pulse width modulation (PWM) active
bit 4 = 0 Lamp Diagnostics for Low Beam inactive
bit 5 = 0 Lamp Diagnostics for Rear Fog Light(s) inactive
bit 6 = 0 Lamp Diagnostics for (Separate) Daytime Running Lights (DRL) inactive
bit 7 = 0 Lamp Diagnostics for High Beam inactive

Proposed modification(same description of bits applies to below)
(D0)16 = (1101 0000)2
bit 0 = 0
bit 1 = 0
bit 2 = 0
bit 3 = 0
bit 4 = 1
bit 5 = 0
bit 6 = 1
bit 7 = 1

Please can somebody help, before i break the van down in to bits and throw them in the river?

View attachment 296968

Turns out, although i cleared the DRL faults and the scans came back clear, the 'Error Free Fogs' i purchased aren't error free at all, a mate had some spare with resitistors fitted and wallop, bulb management light has gone out....

Kudos to you all, as i wouldn't have got this far without this thread and the contributions of @Robert @Andysmee

 

[FWhite]

Original BYTE 16
(0F)16 = (0000 1111)2
bit 0 = 1 Activation of low beam via pulse width modulation (PWM) active
bit 1 = 1 Activation of fog light via pulse width modulation (PWM) active
bit 2 = 1 Activation of Daytime running lights via pulse width modulation (PWM) active
bit 3 = 1 Activation of High Beam via pulse width modulation (PWM) active
bit 4 = 0 Lamp Diagnostics for Low Beam inactive
bit 5 = 0 Lamp Diagnostics for Rear Fog Light(s) inactive
bit 6 = 0 Lamp Diagnostics for (Separate) Daytime Running Lights (DRL) inactive
bit 7 = 0 Lamp Diagnostics for High Beam inactive

Proposed modification to BYTE 16
(same description of bits applies as above)
(D0)16 = (1101 0000)2
bit 0 = 0
bit 1 = 0
bit 2 = 0
bit 3 = 0
bit 4 = 1
bit 5 = 0
bit 6 = 1
bit 7 = 1

Connect to BCM at address 09 and go to CODING.

Hello Robert,
The above method looks straightforward, but will it still work on my '2023 T6.1 Transporter?
Or do I *need* to use the more sophisticated method of changing the bulb type to LED in Adapatation as done
HERE ?
I will get an OBDeleven 3 Pro in a couple of weeks and would give it a try, but I want to avoid dead ends.
And yes, I have installed the NIGHT BREAKER LED SPEED H7 bulbs, that are legal here, "easy" to install like any standard H7 (if you fancy removing the battery and the air filter) , no cables, no adapters, but I still have intermittently a warning light coming up on the dashboard.
Thanks in advance for any comment

 

[Andysmee]

Long term test update... still awesome!

Still awesome!