This is a quick write-up of my understanding of the DTCs and switches in the Siemens PPD and SID803/SID803A/SID206 ECUs. I will be working with the PPD SN100L8000000 file from the sample BDM files.
DTC table entries
There is a table in each file which contains Diagnostic Trouble Codes (DTCs). If you view the table in hex you will see they match up with P-Codes i.e. codes for the powertrain.