This sounds similar to like what mine has done a couple of times, on Friday just gone I had to call out Honda assist!
I was cleaning the car inside and had the ignition on with the radio on whilst I cleaned....as you do!
When I had finished inside and out, I went to start up and got the airbags sign, radio went scrambled and it would not start at all.
Turns out that the battery is not up to the job even for 45 mins of sitting idle and running the radio (according to the guy who came out to get me going again)!!
As I said this is the second time it has happened, I know people have had issues with batteries on here and I have trawled through the threads, but it seems our only alternative is to not listen to the radio as we sit idle in our cars!!
