I found a lot of info scattered about the forums and all over the 'net in general about these mods, but a lot of it was for slightly different models or different years, so I battled with a lot of the wiring until I finally got ElsaWIN installed and traced the wiring diagrams for myself. Installation of the switches is not difficult and well-documented in other threads, but here's the wiring connections and VCDS coding that worked for me, as well as what I learned along the way.
The "right" way to do all these retrofits, by the way, is to order up the proper connectors and use suitable repair wire. I needed three different types of pins: The first are the large spade receivers for the headlight switch N 000 979 133, the second go inside the CH/LH connector housing 000 979 018 EA, and the third kind go into the T32b connector on the Central Electronics Control Module 000 979 009E. In addition, you'll need the CH/LH connector housing part # 8Z0 972 883 (unless you buy a junkyard pull where they clipped the wiring harness and give you the pigtail), the CH/LH & DRL switch (8E1 919 094 D), the auto headlight switch, a rain/light sensor, and the connector housing (or pigtail). Spend a couple extra bucks and order some nice fabric electrical tape so you can make your wiring job all nice and tidy.
FYI, there is still ONE thing not yet working for me... I am struggling to get the rain sensor disabled so I can just control my intermittent wipers with the timing function the way it used to be. I have seen VCDS codes to disable the rain sensor but applying that adaptation still doesn't seem to give me the timer function back. I will update this thread once I've got that sorted out, but in the meantime, here's a 90% solution.
HEADLIGHT SWITCH:
Connect pins 7 and 16 to each other, and connect to pin 29 on T32b of the CECM. All should be empty on a baseline model that did not have the auto headlight switch before.
CH/LH & DRL SWITCH:
Connect pin 3 to pin 30 on T32b of CECM (should be empty)... this is for the DRL switch.
From pins 4 and 8, splice to pin 1 on the headlight switch (do not CUT the wire going to pin 1... it comes from pin 20 on T32b and supplies power to a bunch of stuff)
From pin 5, splice to pin 10 on the headlight switch (again... do not CUT. That's the ground)
Connect pin 7 to pin 24 on T32b of CECM (should be empty)... this is for the CH/LH switch.
The ELSAwin wiring diagrams actually show pin 8 being connected to a wire in the instrument cluster control panel, which is the SAME wire that goes to pin 17 on the headlight switch. My pin 17 was empty, so I connected pin 8 from the CH/LH & DRL switch to it... this might explain why the switch is lit up full bright all the time rather than dimming with the rest of the switch lighting. I'm going to go in there this afternoon and try it the way I have described above (connecting pins 4 & 8 together and running both to pin 1). It's a minor issue so I'm not to fussed about it right now. Okay, so maybe this is an 89% solution.
RAIN/LIGHT SENSOR: (If you do NOT install the rain/light sensor, then you'll get a DIS error in the AUTO position. I also did the trip computer retrofit so maybe you don't get this error if you don't have the trip computer?)
Connect pin 1 to a fused 10A power source. I actually stuck one of the connectors I got for the headlight switch into a vacant spot that was supposed to be for an "auxiliary heater" or something, because the spot was empty and there was a bus bar there already bringing the power to one side of the fuse.
Connect pin 2 to ground. I just tapped pin 10 on the headlight switch again, since I was already doing so in the process of making/modding this harness.
Connect pin 3 to pin 14 of T32b. this was the connection I couldn't find ANYWHERE until I got ElsaWIN and traced it out for myself... so hopefully this helps someone else out.
I "mounted" the sensor behind the fuse panel, so yes, it thinks it's always dark out.
VCDS:
I coded module 9 as 11013. That activates rain/light sensor (2nd digit), sets the country to USA (5th digit), and sets that DRL configuration to turn on the low beams, amber corners, and tail lamps (4th digit).
For adaptations in module 9, I coded adaptation 1 as 20 seconds (CH/LH time), adaptation 8 as "1" (DRL on), and I'm still fiddling with adaptation 13 to try and disable the rain sensor.
UPDATE: I finally figured out a way to regain time-delayed control of my intermittent wipers. It requires a bit of a wiring retrofit/workaround, but I have been very happy with the solution. The write-up can be found in post #20 of this thread here:
http://www.audizine.com/forum/showth...t-wiping-delay
I coded module 17 as 0023208. This sets the country as USA (5th digit). I also set adaptation 19 as 31300.
I hope this helps, folks... more to follow once I sort out the doggone intermittent wiper delay issue.
-Jon
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Originally Posted by Okedokey
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