My 2015 A3 2.0 Quattro (A3 8V body type, of the MQB chassis) did not come with the optional ‘interior light package’, which in the US is part of the very expensive ‘Prestige’ package. However, there were some nice bits that it has that I missed from previous Audis I’ve owned. There are several parts to it, which I’m slowly retrofitting as I find more things out about my car and source the parts (many of which are coming from China or Germany). One that had a lot of people on the forums stumped was the puddle and exit light coding for the rear doors.
For my front and rear door exit and puddle lamps, I sourced the parts from AliExpress. It took about 2 weeks for the parts to arrive but it was all very nice with pre-built harnesses wrapped in the German-style fabric tape, all terminations complete and the LED lights were all branded VAG (Volkswagen Audi Group). Installation was straight forward with just popping out the original reflector and then cutting out the indentation in the bottom of the door panel.
For the front electrical, you’ll plug the prebuilt terminal into slot 16 on the terminal block and pin 5 is ground so you’ll splice into that, preferably with solder and fuzzy fabric tape. It’s pretty obvious how to route the wires and you may want to wrap the new supplemental harness in with the factory harness.
Some nice illustrations are here:
http://garage.jenare.com/pack-eclairage-dans-les-portieres/
One thing to note is that most people have reported that after you’ve reassembled and coded it with VCDS, you will need to power cycle the ignition for it to take effect.
There’s more information on the front door panels online and in the forums than there is in the rear. In fact, the rears have some conflicting information so I can tell you what worked in mine. My car has rear door modules so you’ll extract the individual white terminal block from the plug that goes into the door module and drop the positive feed for the harness into pin 12 of the 16 pin connector. Then you need a ground and pin 13 is a brown wire, which is typically used in VAG cars as the ground, so I spliced into that and soldered it. After reassembly, the door controller has to be coded to acknowledge the light and turn it on when the door is opened. Again, the front doors were simple (using VCDS). The rear doors need to be added via module 19 in the installation list, you’ll add BB & BC, close the controller and go back in to the module list. Then you’ll see the rear doors. These will only be temporarily added as you’ll need to remove them from the installation list once you’ve coded them.
Now, go into each door module and go to Long Coding. Copy and paste the existing coding into a text editor document that you won’t lose. You always want to be able to go back to the original configuration if something goes awry. Plan for the worst and hope for the best.
In my case, the original coding was this for both rear doors:
004117204000048000000002
I then edited the 4th from the left digit to be a ‘5’. This is the only change I had to make.
004517204000048000000002
Below is an image borrowed from the Ross-Tech forums for a different model but similar car that illustrates the entries. As of right now on my A3 8V using VCDS v. 15.7.4, there are no label mappings for the rear doors.
As soon as you commit the coding, the rear lights should be active. Don’t forget to go back into module 19 (CAN) and uncheck the boxes for BB & BC.
Parts to purchase:
AliExpress LED Door Light Kit: http://www.aliexpress.com/item/1-set-OEM-Audi-A3-LED-lamp-foot-stepping-foot-nest-lamp-lights-footlights-Package/32482255651.html
Necessary/Suggested Tools
VCDS or ODIS hardware and software coding
Torx driver set, I believe T20
Interior panel removal tools (I got mine from ECS Tuning)
Wire splicing mechanism, solder and fabric tape recommened
Time to Complete
The first door took me about 45 minutes on the hardware, each subsequent door was about 20 minutes, then about 15 minutes to code it with VCDS
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