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Sorry for the confusion, are we saying the LED rear lamps have a traditional filament lamp on the indicator? Or was the resistor just for the standard non led rear lights?
T6/T6.1 Sequential LED tail lamps "retrofit"
- Thread starter Robert
- Start date
Yes.
Sadly, I can report that this mod is nigh on impossible on the T6.1 LED rear clusters. There is no easy access inside. I have a spare cluster that I’ve been experimenting on. The only easy way inside would be to cut the lens off but there would be little hope of re attaching it so it looked OEM. It’s not one flat PCB inside with all the LEDs on
Is it possible to heat up the whole unit in the oven and then split it in half? I mean to separate lenses part from the back side?
I don't think so. It looks like it's sonic welded
i used resistors that I already had lying around.
Ah, the common gold-colour cylindrical ones?
Yep
Do they fit ok, then? Any heat issues (assuming you’ve test-fitted)Yep
No issues what so ever. I put LED bulbs in my original clusters two years ago. Plenty of space for them
OEM T6 rear LED lights are factory equipped with 16W filament bulb for indicator.
My LED sequential strip take 0.33A, which translates to 4W.
This is obviously short by 12W to expected 16W and results with hyperflash and double frequency click in the instrument cluster.
Available coding adjustment for indicator setup is as follows
BCM 09, Byte 18
bit 3&4 = front/rear/side
00 = 21/21/5 W
01 = 21/27/5 W
10 = 21/16/5 W
11 = 27/27/5 W
The lowest possible setting is "10" which I had already as a factory setup so the only solution was to add extra resistor.
Quick maths
Required indicator additional power(wattage) = 16W - 4W = 12W
P = U x I ---> I = P / U = 12W / 12V = 1A ===> R = U / I = 12V / 1A = 12Ω
So the selected resistor was 12Ω and for sufficient heat dissipation 50W seems to be sufficient.
My resistors---> RS PRO Panel Mount Resistor | RS Components
View attachment 62854
Credit to @Loz for resistor type and resistor layout inspiration
the 50w resistor is on back order will the 100w one work ok?
Yes, of course it will
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ThanksYes, of course it will
Surely a 25W one will do the job? I'tll be smaller and cheaper too, and even that size is twice as big as (my) maths says?
12ohms at 12V is 1A
P=1^2 x 12=12W
Arcol, 12Ω 25W Wire Wound Chassis Mount Resistor HS25 12R J ±5% | RS
This is me being curious, please don't rely on it as a solution, I never tried it.
My 50W was purposely oversized to avoid any future problems but 25W should also be fine.Surely a 25W one will do the job? I'tll be smaller and cheaper too, and even that size is twice as big as (my) maths says?
12ohms at 12V is 1A
P=1^2 x 12=12W
Arcol, 12Ω 25W Wire Wound Chassis Mount Resistor HS25 12R J ±5% | RS
uk.rs-online.com
This is me being curious, please don't rely on it as a solution, I never tried it.
While I wait for the bits to arrive to do the rear.... does anyone have any suggestions for the front indicators (led headlights)? I cannot understand why vw do LED lights yet keep the indicators halogen. I have seen side repeaters that are LED but little in the way of bulbs and resistors for the factory fit led fronts...
Watch this space
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