Hello The Don,
Thank you very much for your reply and very interesting links.
The reason I was enquiring about PINs is that I have purchased a 2nd hand Subaru Forester.
After about a week, I used the key instead of the fob to open the driver's door and unwittingly set of the alarm siren.
This, of course, immobilised the vehicle. Now all I get is the siren all the time. I cannot stop it.
Someone told me that if I enter the PIN into the keypad the alarm will stop! I will try everything.
Cheers?