SCPB wrote:

My 2010 range rover has just started doing exactly the same. It is a shrill, short, chirp noise of a second or less, but it seems to do it regularly every few hours. As the car is parked in the garage, I don't always hear it, but when I do, it always seems to be at half past the hour! It has scared the life out of me a couple of times when I was in the garage and it made the noise.

The main battery is fully charged and was replaced less than a year ago.

To try and fault find the problem, tomorrow I will leave the car unlocked and see if it happens then. Does yours only do it when the alarm is on?