I bought a 2000 Honda Prelude not to long ago and while I was doing some interior maintenance I found that the previous owner had installed a switch to the ECM now according to a previous post https://honda-tech.com/zerothread?id=918703 it was installed on

C10---wht/yel------ECM Backup Power

Why would you install a switch on the ECM's backup power??

 

Some type of kill switch for security?

 

sounds like the OBD2 workaround mod heh