On the mk8 do we have access to the central electronics adaptations to adjust the LED brightness for the taillights? There's a video by shopdap showing how to do this for the mk7. They first use 31347 then make the changes. That code doesn't work for the mk8.
I purchased euro LED tailights and the brightness is different between the inner and outer. When I tried to adjust the brightness following the guide for the mk7.5 I got an error "function not available". I thought I was checking the wrong light but I tried many, changing the "dimmerwat" from 127 to 100 always resulted in "function not available".
It looks like the BCM is unable to dim these channels. Either it is a non working configuration between Leuchte Typ (this sets how the dimming is made, either via Current Limitation (incandescant/halogen) or PWM (leds) or even not allows this, so only 0 and 127 are allowed) and the used output of the BCM is not able to dim properly and constantly. An admap of the leuchte channels for the high leds would be helpful, I can check if I have something ready to share.
Again some remarks here: *The OEM fixtures are using a dedicated single, daisy chained wire from the BCM to the lights to control the dynamic turn signal. So to enable them you will either need to code and refit this wire or bridge them properly (but not sure if this will mess up the diagnosis). Also, the turn signal runs through all 4 fixtures and also needs to wired. In case there is no turn signal in the inner ones or they do not credit the dynamic enable pin, I am rather sure you bought a chinese copy.
*I have never seen G8 with visible brightness differences between the rear lights. Also, there is no service procedure to adapt them. So this looks like a hardware fault to me at first glance.
Please be so kind to set your app's language to English when posting screenshots and before trying out coding suggestions. This will help everbody to understand and advise.
These aftermarket sets have a built in dynamic turn signal that functions as long as you provide all four parts with a constant 12v, which I did as show below. It's optional so if you don't connect it you get normal turn signals. No coding is required.
As for the brightness issue this appears to be a common problem, ShopDAP has a video adjusting the LEDs on the mk7.5. If you skip to two minutes into this video you can see what he does with OBDeleven
Just to get everything correct: The original high leds for EUR are using *Parking light, all fixtures individually wired and controlled by BCM (4 wires) *Brake light, both outer fixtures individually (2 wires) *Turn signal, all fixtures individually wired (4 wires) *Dynamic trigger, one wired daisy chained or distributed (1 wire) *Rear fog, one outer fixture (depending on the driving side, 1 wire) *Reverse lights, outer fixtures (2 wires)
You will see that every fixtures has a spare pin, not wired and not installed in the connector. This is likely reserved for LIN-Bus, which is not used for the outher lights in the Golf right now.
Some side note first: The BCM for the MQB-Series was able to dim almost all output pins in both approaches, some pins even with high current: Current limitation (for bulbs) and PWM (for LEDs). In MQBw, the functions have been reduced (lesser parts, cheaper, not used anymore like current limitation for rear lights). Also, there are interlocks with datasets. So in the end, there are similarities to old MQB, the logic is still the same, but the old approaches need to be retought.
The lasttyp setting tells the BCM what dimming approach is to be used. Rear lights are dumb with no intelligence or diagnosis circuits (Golf 8) or are a LIN Slave (Octavia), while LIN proramming is out of reach for OBD11 and all other tools.
So everything should be done in the BCM (Central Electrics). As promised, here is a admap from a Golf 8 (EUR, IQ-Light, Variant), reduced to the rear lights, Values not listed shall be set to 0, Maximize or nicht aktiv: [VO]_Leuchte 16 BLK SL B42_C31: [LO]_Lasttyp 16: [VO]_LED_Blinkleuchten_UeSpg_OL65_T200 [LO]_Lampendefektbitposition 16: 8 [LO]_Fehlerort mittleres Byte DTC-DFCC 16: 41 [LO]_Lichtfunktion A 16: [VO]_Blinken links Hellphase [LO]_Dimmwert ABC 16: 127 [LO]_Lichtansteuerung HD ABC 16: [VO]_always
[VO]_Leuchte 23 SL HL C10: [LO]_Lasttyp 32: [VO]_allgemeine_LED_mit_Open_Load_Diagnose_12W [LO]_Lampendefektbitposition 32: A [LO]_Fehlerort mittleres Byte DTC-DFCC 32: 29 [LO]_Lichtfunktion A 32: [VO]_Standlicht [LO]_Lichtfunktion B 32: [VO]_Parklicht links [LO]_Dimmwert ABC 32: 60 [LO]_Lichtansteuerung HD ABC 32: [VO]_only if closed [LO]_Lichtfunktion D 32: [VO]_Standlicht [LO]_Lichtfunktion E 32: [VO]_Parklicht links [LO]_Dimmwert DEF 32: 100 [LO]_Dimming Direction DEF 32: [VO]_maximize [LO]_Lichtfunktion G 32: [VO]_Heckdeckel geschlossen [LO]_Dimmwert GHI 32: 60 [LO]_Dimming Direction GHI 32: [VO]_minimze [LO]_Lichtfunktion J 32: [VO]_Ambiente Exterior 5 [LO]_Dimmwert JKL 32: 60 [LO]_Dimming Direction JKL 32: [VO]_maximize
[VO]_Leuchte 24 SL HR A65: [LO]_Lasttyp 24: [VO]_allgemeine_LED_mit_Open_Load_Diagnose_12W [LO]_Lampendefektbitposition 24: 1A [LO]_Fehlerort mittleres Byte DTC-DFCC 24: 2A [LO]_Lichtfunktion A 24: [VO]_Standlicht [LO]_Lichtfunktion B 24: [VO]_Parklicht rechts [LO]_Dimmwert ABC 24: 60 [LO]_Lichtansteuerung HD ABC 24: [VO]_only if closed [LO]_Lichtfunktion D 24: [VO]_Standlicht [LO]_Lichtfunktion E 24: [VO]_Parklicht rechts [LO]_Dimmwert DEF 24: 100 [LO]_Dimming Direction DEF 24: [VO]_maximize [LO]_Lichtfunktion G 24: [VO]_Heckdeckel geschlossen [LO]_Dimmwert GHI 24: 60 [LO]_Dimming Direction GHI 24: [VO]_minimze [LO]_Lichtfunktion J 24: [VO]_Ambiente Exterior 5 [LO]_Dimmwert JKL 24: 60 [LO]_Dimming Direction JKL 24: [VO]_maximize
[VO]_Leuchte 28 RFL L C11: [LO]_Lasttyp 28: [VO]_allgemeine_LED_mit_Open_Load_Diagnose 12 W [LO]_Lampendefektbitposition 28: A [LO]_Fehlerort mittleres Byte DTC-DFCC 28: 35 [LO]_Lichtfunktion A 28: [VO]_Standlicht [LO]_Lichtfunktion B 28: [VO]_Parklicht links [LO]_Dimmwert ABC 28: 60 [LO]_Lichtansteuerung HD ABC 28: [VO]_only if closed [LO]_Lichtfunktion J 28: [VO]_Ambiente Exterior 5 [LO]_Dimmwert JKL 28: 60 [LO]_Dimming Direction JKL 28: [VO]_maximize
[VO]_Leuchte 29 RFL R A64: [LO]_Lasttyp 29: [VO]_allgemeine_LED_mit_Open_Load_Diagnose 12 W [LO]_Lampendefektbitposition 29: 1A [LO]_Fehlerort mittleres Byte DTC-DFCC 29: 36 [LO]_Lichtfunktion A 29: [VO]_Standlicht [LO]_Lichtfunktion B 29: [VO]_Parklicht rechts [LO]_Dimmwert ABC 29: 60 [LO]_Lichtansteuerung HD ABC 29: [VO]_only if closed [LO]_Lichtfunktion J 29: [VO]_Ambiente Exterior 5 [LO]_Dimmwert JKL 29: 60 [LO]_Dimming Direction JKL 29: [VO]_maximize
[VO]_Leuchte 26 NSL L A72: [LO]_Lasttyp 26: [VO]_allgemeine_LED_mit_Open_Load_Diagnose_12W [LO]_Lampendefektbitposition 26: C [LO]_Fehlerort mittleres Byte DTC-DFCC 26: 2E [LO]_Lichtfunktion A 26: [VO]_Nebelschlusslicht wenn kein Anhaenger gesteckt und Rechtsverkehr [LO]_Dimmwert ABC 26: 127 [LO]_Lichtansteuerung HD ABC 26: [VO]_always So there are, against my memory, some Leuchte settings which are always set to 60% which should be checked. In case these settings are not having the desired effect, I would like to blame the lights to be bad knockoffs. I have seen plenty of Golfs with these rear lights and never had the idea that they are off regarding the brightness
Thank you. I used the light driver power in the live data to determine the two inner taillight circuits
Driver's Side - Leuchte 28 RFL L C11 Dimmwert ABC 28 - Original is 127, your value is 60.
Passenger's Side - Leuchte 29 RFL R A64 Dimmwert ABC 29 - Original is 127, your value is 60
I changed both to 60 but it didn't seem to make a difference, however I'm going to wait a day since there's sometimes a delay. The only other setting for these lights that differs is "Lichtfunktion J28/J29" which is not active for me, but you have "Ambiente Exterior 5" I haven't checked this function yet.
I also ordered a PWM 12v dimmer to see if I can directly control the lights.
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