Yes I believe it is the stock alarm, the former owner had to "bang" the fob a couple times before it would work.
I guess he "banged" it too much
I found a post on another site where someone had the same problem of not being able to get into reprogramming mode, he reckons that by disconnecting the battery for a couple of hours and then reconnecting it he was able to get into reprogramming mode.
But that didn't work for me.
I know this is a
question but when exactly does the 10 secs start? is from the driver's side door being locked or from the first time you put the key in the ignition chamber?