If you own an old (pre 1990??) acc car without the off button then the fault codea are like:
1c or 1o
2c or 2o etc for (these are listed here somewhere in the 9000 section)
item n open or closed circuit
For ACC2 (off button), then you just get the number of errors (0 through 5) which need a tech2 or Isat to retrieve.
Andrew