mlewando - for the front footwell light how do you connect it to the BCM?
I'm sorry to bother but i'm also looking for this answer.
I want to install front footwell lights on my trendline.
Regards
mlewando - for the front footwell light how do you connect it to the BCM?
This coding does not activate menu in the radio unit. But the footwell light works as expected when headlamp is switched on and whenever interior light is turned on. If anyone has factory coding then please share it.
Thanks for the info. I did this coding and got the menu option but unable to control the brigtness. Could be since I did a workaround coding and not proper footwell light coding.(8)-Interior light; light configuration-Fussraumbeleuchtung
Change value from ‘not installed’ to ‘installed’
carbon_geko: Hi.So i have done the wiring and coding but I have a issue: using VCDS when long coding byte17 bit 3 I have nothing to select but bit 6 and bit7 (neither are selected so it is all zeros) what digit do I switch to 1 to activate bit 3?
Thank you for the help, I check some other sources after reading this( I was off by 1 bit) I had selected ambient cup holders lights installed.carbon_geko: Hi.
It's done like this:
First, some numbering theory - sorry for launching into techno-speak:
long-code in these modules are expressed as both hexadecimal numbers and Binary numbers (Hex numbers have an equivalent Binary number).
Bytes have 2 x digits when expressed as hexadecimal numbers and they have 8 x digits when written as Binary numbers. Each digit in a Binary number is called a Bit.
A Bit is either 1, or 0 - whereas a each digit in a hex number can be 0, 1, 2.........9, or A, B......F (so up to 16 x different values).
The rule for Hex numbering is the opposite to decimal numbers - meaning that Byte#0 is the pair of digits on the extreme LHS of a hexadecimal number.
However, the rule for Binary numbers is that the right-most digit is Bit#0 - so the left most digit is Bit#7 (yes, this is the same as decimal numbers where the lowest value number is on the RHS).
Second, lets look at your module - You say that your Byte 17 "is all zero" - this means that currently Byte#17 has the Binary number = 00000000. I've highlighted Bit#3 -which is the fourth digit from the right-hand-side (since the right-most digit is Bit#0 - Bit#3 is the 4th digit).
To set Bit#3, the Binary number for Byte#17 = 00001000. This Binary number has an equivalent hexadecimal value = 08.
Third, my suggestion for a way forward with VCDS - The Open controller screen below shows the long-code value of a typical UDS module in hexadecimal numbering. Each pair of digits in the Current coding box is a Byte. Again, the rule for Hex numbering is the opposite to decimal numbers - meaning that Byte#0 is the pair of digits on the extreme LHS of the string of numbers.
So, in VCDS, don't select the long coding helper screen. Instead on the screen below, copy-and-paste the value in Current coding to New coding (of course, use module @ address hex09 and use your long-code values - not the values on the screen).
Then, CAREFULLY count 17 x pairs of digits in New coding from the LEFT hand side to get to Byte 17. The next 2 x digits (i.e. the 18th pair of digits from the LHS - because the 1st pair is Byte#0) will be the hex value for Byte 17 - the value should be "00". Change this to 08 -then check your counting again, and press Do it!
Don
Hey guys,
Just came across this product on Aliexpress. It seems to have some sort of a piggy back so that you don't have to mess with the BCM?...
What are your thoughts folks?
Thank you so much for this info! I have a golf R with existing front footwell lights so I’m assuming all I do is plug these in to the front lights and run them to the rear seats, correct?What are you trying to do exactly? This is a piggyback harness to add rear footwells if you already have front ones. It will let you add rear footwell lights without having to modify your existing wiring. Completely reversible , not that there would be a scenario where you would need to reverse this.
All of the footwell lights share one power wire to the BCM. They also share one ground that could be grounded anywhere to any chassis ground point. Adding/removing this harness won't require any changes to coding, just plug and play to give you rears.
Edit: And for a golf, you would need what they call the "big plug" version, as that's the plug we have. And our rear footwells snap into an existing cutout in the front seat pan, so no bracket needed.
Yup, that would be it in your case. You will want to match the bulb types though, LED or incandescent. I believe the stock ones are incandescent but the pictures in the listing look like LED's (listing also has a mention about colors not matching factory fronts but still doesn't mention bulb types). Just remember all the footwell lights are powered by the same output from the BCM so you want similar resistance in all the bulbs. If you have already replaced your stock bulbs with LED's I would just get a another set, that way you know for sure they are match. And if you haven't, would be cheap to just buy a set of four.Thank you so much for this info! I have a golf R with existing front footwell lights so I’m assuming all I do is plug these in to the front lights and run them to the rear seats, correct?