Audi A4/S4 B6/8E VCDS
Updated 21 Dec. 2010
Ross-Tech is not responsible for any
damage or problems that may result from following these instructions. They
are to be used at your own risk.
Depending on equipment level, the "new" Audi A4 can have so many
control modules in it that putting them all on the same ISO9141 bus
(K-Line) would exceed some of the electrical characteristics allowed by
the spec. To get around this problem, the new A4 may
have two K-lines. In "basic" cars, all control
modules are on K1. In a car loaded with options, most control
modules will be connected to K1 and will be accessible using all standard
ISO9141 interfaces. However, a few modules may be connected to K2
instead of K1. We've heard from Europe that cars with Xenon
headlights have the second K-line and cars without Xenon's don't, but
we're not 100% sure this is is the the dividing line in North American
The dealers' solution is to put a VAS-6017
adapter between the scan-tool and the car. This device acts as an
intelligent switch, making an automatic determination which K-Line a
control module is connected to. The VAS-6017 works fine with
the interface adapters supplied with VCDS, but it is pricey, expect to
pay over $200 if you want to buy one of these. Naturally, a less
expensive solution is available to VCDS users. All of our
current Interfaces fully
support for the dual K-lines.
A number of the control modules in the new A4 use the
new KWP-2000 protocols for the data-transport layer. KWP-2000 has
some different features from the KWP-1281 protocol, see our
Function Chart for details. You
should use the latest version of VCDS
for the most complete functionality.
The settings described below were tested on our 2002
development vehicle. Although VCDS works great with the 2003+ models,
many of the coding and adaptation options may not work in the 2003 and
If/when someone finds the 2003+ options, we'll gladly post them here.
K1 -- KWP-2000
02-Auto Trans : K1 --
Tiptronic: VCDS is reported to work well.
Multitronic: Is also reported to work fine.
03-ABS Brakes: K1
VCDS works fine
08-HVAC: K1 --
Mod. K1 –
VCDS works fine.
Tweak: Coding options for
lighting Coding is 000XY.
X=1 for Xenon Headlights,
X=0 for conventional Halogens.
DRLs: Fogs w/o low beams:
Y=1 RDW (Rest of World) No Yes
Y=2 NDL (Netherlands) Yes Yes
Y=4 KAN (Canada)
Y=5 DAN (Denmark?)
Y=6 SON (Other?)
Fogs w/o low beams only appears
to work on 2002 models. For 2003+ models, we know of no way to run the
fogs without the low beams, except Canadian, which turns on Daytime
Running Lamps (DRL's). We are not sure why there are so
many Yes/Yes combinations; there must be some other features controller
by this. The state of the Radio and Climate Control lighting
is affected by this coding as well.
K1 – KWP-2000
VCDS works well with present limitations of KWP-2000 support
16 – Steering Wheel
VCDS appears to work fine.
Interesting to note that this module exists even in cars without any
control buttons on the steering wheel.
K1 -- KWP-1281
VCDS Works fine.
There are four lighting modes:
Mode 0: Nothing lit until ext. light on
Mode 1: Pointers lit all the time
Mode 2: Scales lit all the time
Mode 3: Pointers and Scales lit all the time
Mode is changed in Adapation Channel 19. Standard value
should be 11000 (or something close). The first (left-most) digit
is the lighting mode.
22-AWD – Not applicable to
The quattro system in these cars is purely mechanical, no electronics at
all. This address is used by the Haldex system used in
transverse-engine cars like the TT, the A3, and various Golf/Bora models.
Not applicable. All functions moved to 46-Cent.Conv.
VCDS appears to to work fine.
Not tested. Expect to find it on K2.
Monitor: K1 -- KWP-1281
VCDS Works fine.
Adaptation Channel 01 is sensitivity (default 100).
46 - Central Convenience:
VCDS works well. We've had some problems with
errors while getting the Door-Slave part numbers. If VCDS errors
out while trying to display the information in the "Extra"
fields, go to the Options Screen and set "Char Int" to 0.
are numerous options/ features that can be set. These
are controlled by the Coding and in Adaptation Channel 62. When we
published a simple table, many people didn't understand it, so here's an
Let's look at Adaptation Channel 62 first (it is simpler, fewer bits than the Coding). The
original value in a US 3.0L model is 95. Both a real VAG tool and VCDS display these values in decimal. 95 decimal is 5F
hex, or 01011111 in binary.
Now we can correlate the bits with the chart
for Adaptation Channel 62:
State Bit Dec. Function
ON 0 1 windows up with remote
ON 1 2 windows down with remote
ON 2 4 windows up with key in lock
ON 3 8 windows down with key in lock
ON 4 16 sunroof close with remote
OFF 5 32 sunroof open with remote
(does not appear to work)
ON 6 64 sunroof close with key in lock
OFF 7 128 sunroof open with key in lock (does
not appear to work)
Also, you will see if we add up the decimal values for each of the bits
that are ON, we can verify that we did it right because we got the
original Adaptation value of 95.
1 + 2 + 4 + 8 + 16 + 64 = 95.
By now you're likely starting to wonder why "Windows with Remote"
stuff doesn't work since the appropriate bits appear to be ON. To answer this question, we need to look at the coding the same way. The
original coding in this car is 11788 (decimal). That's 2E0C in hex or 010111000001100 in binary. Again, we can again
correlate the binary bits with the function table, just like we did above.
Central Convenience Controller Coding:
State Bit Dec. Function
OFF 0 1 Great Britain-
alarm system (only with bit 4)
OFF 1 2 flash on when arming/unarming
ON 2 4 selective locking 1 door/all doors
ON 3 8 activate
OFF 4 16 rear unlocking block via speed
OFF 5 32 locking via speed
OFF 6 64 comfort functions with remote (adapt in ch 62!!)
OFF 7 128 right side steering
OFF 8 256 avant (glass break
sensors in rear side-and rear
windows (if error: safe-LED constantly lit ))
ON 9 512 1x flash when lock with remote
ON 10 1024 horn sounds when lock with remote
ON 11 2048 door/window-logic ( ignition off: No open door
el. windows works 10 min )
OFF 12 4096 normal/????-alarm system
ON 13 8192 No SAFE-function USA only
OFF 14 16384 insulate-glass PR-nr 4KR/4KV
Again, we can verify that we did this correctly by adding up all the
decimal values for the bits that are ON:
4 + 8 + 512 + 1024 + 2048 + 8192 = 11788.
Now notice that bit 6 with a value of 64 and function "comfort
functions with remote (adapt in ch 62!!)" is OFF !!! So in order to turn this
ON, we need to add 64 to the original coding. 11788 + 64 = 11852.
Recode the module with that number. Once you do that, the options in Adaptation Channel 62 should take effect, and you can change the value
there to "fine tune" the features..
If you wanted to add "locking via speed" (where the car locks itself as soon as you reach some low speed), you would add 32.
If you wanted to turn Selective Locking OFF, (so the entire car unlocks with one press of the unlock button on the remote) you would subtract
Hopefully this makes sense to everyone..:-)
55-Headlight Range: K2-KWP1281
VCDS Seems to work fine.
Note this controller is only present on cars with Xenon headlights.
K2 – KWP1281
VCDS appears to work fine, but we don't entirely trust any Audi
We have not identified any tweaks at this time.