So, I guess it has finally happened that the car has ripened into a lemon.
As it stands at the moment my car is only getting used perhaps once or twice a month due to various reasons. it is always used for long journeys however so I didn't think keeping the battery charged would be an issue.
Yesterday though, I went out to do my routine potterings and the car wouldn't start, i measured the voltage across the battery and it was 4.4V. Dead battery... it was a Unipart thing though so I have no idea how old it was. I have replaced it today with a Varta E44 battery, however as soon as I connect the earth to the battery the alarm starts blaring out. no combination of keypresses or anything will shut it off, it seems to go on for about 20 seconds then turn off for about 10 seconds, and repeat itself indefinitely.
The engine also won't start, it cranks however doesn't seem to be getting any fuel - the isolator switch is pressed how it should be, but what worries me is that the green key symbol on the dash remains flashing. It's doing this with both my keys (neither of which were within 10 yards of the car when the battery was swapped) which suggests something has gone wrong with the immobiliser.
Is there anything further I can do to diagnose this fault or is this going to be a tow truck to Honda job?
It's a 2006/56 diseasel, according to Honda there are no outstanding recalls on it.