Hi everyone, we have become the proud owners of our first Yaris it's a 2002 1.3 CDX automatic with an incredible 43,000 miles and one previous owner!!! It's fitted with parking sensors (they look life factory fitted) but they don't seem to be working. No beeping when put into reverse or any signs of life. We can't find any help in the owners manual....is there something I can do? Thanks for reading this any help would be very welcome