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Hi Stefan,

After a few days, I can now say that the FIS-control works very well on my car. I just have to wait a little sometimes but it always end up by activating it itself.

I just have a request for you now. I don't know if it's a lot of work for you, but I would be very happy if I had a new option in the main menu which would enable/disable relay #1 (and maybe saving its state in the EEPROM?)

Something like that :

EXIT
EXHAUST VALVES <-- new option : enable/disable relay#1 ("ECHAPPEMENT" in french)
PRESETS
MEASUREMENT
READ DTC
...

What do you think ?

I tried again after a day without using the car and it didn't work, I had to switch the ignition ON/OFF several times.
The autostart logo was enabled, I thought I can enable it again after the "trick". I don't know if I shouldn't do that.
RNS-E was OFF before.

Otherwise, I played with the "UART <-> DIS" function. I made a little Windows application to send data over the bluetooth serial bus. Just for fun for the moment, but it's a nice function !

Maybe it will help, but it seems there's a conflict with my RNS-E.
I noticed that when the RNS-E is already OFF since a "long" time before switching ON the ignition, I can activate the FIS-control on the first time.

I think it's because the RNS-E is sending data on the CAN bus before than the FIS-control is powered.
Switching ON/OFF the ignition several times then trying to activate the FIS-control is just matter of chance ?

I think that the RNS-E is still sending data on the CAN bus a few minutes after switching it OFF.
It should explain why the FIS-control works well on the first time only when the RNS-E is OFF since a moment.

Ok. You can send me a firmware by email if you want.

Thank you very much for your help !

I disabled the startlogo and I tried a few hours later and that's not better. I had to switch OFF/ON the ignition 5-6 times.

So I'll try it ! Thanks !

The RNS-E always display the current song/radio on the first upper line.

Otherwise, it display the GPS direction ("N", "S", "SW", ...) in the middle part of the screen, event with no active route guidance.
It display this if I select the "third screen" of the ODB (which I select via the button under the wiper stalk), first one is the ODB "memory 1" and second one the ODB "memory 2". There's also a 4th "screen" where nothing is display (except the selected gear on the bottom line, because I've go a Tiptronic gearbox).

If the RNS-E is off, everything is OK. If it is ON, there's the issue I tell you above and if I display something of the FIS-control with the ODB, sometimes I can't do anything back in the FIS-control.
Ex. : current speed displayed on the 2 upper lines by the FIS-control, middle of the screen is the ODB. Sometimes, I can't go back in the FIS menu, UP and DOWN button changed the ODB infos while current speed is still on the upper lines.
Only solution : switch ignition OFF then ON.

Hi Stefan,

I tried to connect my Arduino with I2C, but unsuccessfully. I used the "Wire" library, on address 0x40 (64 in decimal).
That's not a big deal, for the moment I'm using "Relay 1" to toggle the exhaust valves (with a voltage divider between FIS-control and the Arduino). It works flawlessly !

I have another issue. In my S4, I've got a radio/navi RNS-E (OEM) and if it is ON, I can't use the FIS-control. When pressing the UP button to activate it, only "FIS CONTROL" is display on the two upper lines of the cluster.
If I switch OFF the RNS-E, the FIS menu appear and I can use it.
If I switch ON the RNS-E, it's still OK, I can use the FIS-control.

But if I exit from the menu, when I want to go back in, only "FIS-control" appear on the upper lines and I have to switch OFF the RNS-E, etc.

It's like the RNS-E is more prioritary than the FIS-control.

Did I did something wrong with VCDS or in the FIS-control setings ?