Ok, you have
1C0-959-799-C-0C7.
That's compatible with the DWA. The DWA has three wires...
1. LIN-BUS to the CCM, pin t15/3
2. ground
3. permanent plus (fused with 10 Amps), the one closer to the rounded edge of the connector
If you have already the stock ugly horn, you can reuse the two wires that you have already, and route a new one for the LIN-BUS. You will find the red/something wire in the CCM, pin t15/11... t15/12 is the wire that comes from the fuse/battery connection, so the mod here is to extract pin 11 and 12 from the t15 connector and connect them together. Now, at the siren side, there will be permanent +12 volts (fused) and ground.
Run a new wire from the siren to the CCM, t15/3 (you will need a small pin, smaller than those from t15/11 or t15/12).
At this point, all the HW mods are done. Now, get vds-pro (as far as I know, copyrights have expiration, and as far as I know, the SW manufacturer no longer exists and no longer renewed the copyrights) and follow these steps:
- read address 4367 (decimal), for example 255
- if it is 255, then write your new value will be 112.
- if it is different to 255, then you have any kind of country setting... ok, convert the number to binary. Example, if you have 32 at 4367, then convert this to binary: 001
00000. The bit in bold is the one that activates the DWA. Replace this bit with 1... so the new number will be 001
10000. Back to decimal, this is 96... that will be your new value.
- Now, the new value has to be written three times at addresses 4367, 4368 and 4369.
That's all. Please report any issues