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I just did it to mine (US model). Maybe the early models had a different system, but I have the Bosch 5.7 DSC III and it was in NCS expert/dummy. Just need to figure out the interior reset button now.
So, i just got the latest CI19 coding Index DSC5.7 and there is no Option to activate RPA!
Fortunally i also bought a RPA module to retrofit it.
 

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Thats not going to work as your DSC needs to send the appropiate signal, and it can't do that because there is no routine inside to check the tire diameter and calculate pressure.

If you want run flat protection in a E46 AWD you need a special module called DWS. It's housed in a similar box like the EWS unit and it needs to be mounted behind the glove box.
  • RPA: runflat protection by using algorithms in the DSC unit
  • RDKS: runflat protection by actual tire pressure sensors
I very much prefere the RPA style approach.
 
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