Haha here he goes.Watch this space.
I looked at these. I reckon a long strip similar to @Robert ‘s tail lamps indicators, but doubled-up so that the second strip faces backwards thus illuminating the cluster would sufficiently illuminate it
OEM T6 LED Rear Lights With Sequential LED Indicator "retrofit"
- Thread starter Robert
- Start date
I looked at these. I reckon a long strip similar to @Robert ‘s tail lamps indicators, but doubled-up so that the second strip faces backwards thus illuminating the cluster would sufficiently illuminate it
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.
RS PRO Panel Mount Resistor
Credit to @Loz for resistor type and resistor layout inspiration.
@Robert just a quick one - my resistors have arrived and I just want to check I’m splicing the correct wires.
Is it the two that are beside each other (wires 1 and 2, with 4 being left alone)?
That’s what it appears to be, but your image resolution has been downsized.
(I’ve soldered the LEDs to male wedge connectors)
I have not started this project yet, so i was just going to get my multimeter on the pins and work out which one had voltage when the indicators are flashing. You only need to add the resistor in-line on the positive led. Where did you get the blue wedge connectors from and do they fit into the bulb holder ok?
Extra resistor has to be added parallel to the LED stripe and not in series. Obviously resistor value (ohm) should be calculated based on the wattage of your LED stripe.
I don't remember mate.
Hopefully I will find some time this evening and get it verified for you
.
They were an eBay purchase and fit the holders fine. They took 17 days to arrive.
Sorry you are right, my mistake. The resistor needs to be across the load (led strip) to increase the resistance. I will know more once all my bits arrive...
As I have mentioned before(somewhere else) some sequential LED strips are voltage sensitive.
For example they work perfectly with 12V DC and then they misbehave with increased voltage of 14.5V DC(when engine is running).
Luckily these strips are very rare and majority of recent/modern strips cope very well with increased voltage.
Then there is another trap.
Indicator's pulses can be PWMed(Pulse Width Modulated) and this is controlled by the BCM coding.
Almost all aftermarket LED strips don't like PWM and they won't work properly, especially when engine is running.
This is how indicator pulses look like when PWM is ON and engine is running.
And this is how indicator pulses look like when PWM is OFF and engine is running.
To deactivate indicator PWM the following VCDS coding modification needs to be applied.
09 BCM, (Byte 19, bit 3) = 0 (unticked)
) some sequential LED strips are voltage sensitive.For example they work perfectly with 12V DC and then they misbehave with increased voltage of 14.5V DC(when engine is running).
Luckily these strips are very rare and majority of recent/modern strips cope very well with increased voltage.
Then there is another trap
.Indicator's pulses can be PWMed(Pulse Width Modulated) and this is controlled by the BCM coding.
Almost all aftermarket LED strips don't like PWM and they won't work properly, especially when engine is running.
This is how indicator pulses look like when PWM is ON and engine is running.
And this is how indicator pulses look like when PWM is OFF and engine is running.
To deactivate indicator PWM the following VCDS coding modification needs to be applied.
09 BCM, (Byte 19, bit 3) = 0 (unticked)
I have also bought these (inexpensive experimenting).
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And once PWM is switched off they work perfectly.
I tested voltage span as well and these work from 7V DC up to 15V DC no problem.
).
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And once PWM is switched off they work perfectly.
I tested voltage span as well and these work from 7V DC up to 15V DC no problem
.
No need for an apology.
You’re a gent. Thanks mate, appreciated
Yes, indeed sometimes the PWM can induce LEDs having a regulator "onboard" to misbehave....
We are not trying to increase the resistance but actually to reduce it.
And by reducing the resistance we are "forcing" more current to be produced by BCM output and this way the BCM thinks that there is no fault cause expected wattage is being consumed.
Has this happened to you? Do you know where these LEDs were installed?Yes, indeed sometimes the PWM can induce LEDs having a regulator "onboard" to misbehave....
View attachment 68310
Yes, those were mine. I had them in a T6 in cargo room roof lamps (replacing the regular bulbs). After a few weeks the smoke came out.
Before installing them I had tested them on a bench. Had them turned on more than 20 hours at different voltage levels (10, 12.5, 15 V) to verify they won't warm up excessively - as they have some fancy electronics. Obviously need to add a test point into my procedure
However, can't exclude the infamous BCM on early T6's - which probably didn't shut down properly as at the worst starter batteries were flattened. Was eventually cured by a BCM software update.
Seems like the safer option to turn it off, would it have an effect on anything else? Can you recommend a resistor as well please as I've fitted LED indicator bulbs in the rear, they work perfectly but i have fast flash on the dash!
You need to perform some calculations/measurements to select correct ones.
Have a read below.
EDIT:
There are no side effects whatsoever when PWM is deactivated on indicators.
Have a read below.
EDIT:
There are no side effects whatsoever when PWM is deactivated on indicators.
Cheers for that, im going to have to read it a few time as i dont understand the equation part at the moment!
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