We've had this current Picasso since October. It's a 52 plate but only done 56k miles.
Last Sunday morning I drove a few miles and all was fine, but next time I drove it, that afternoon, the speedo had gone crazy. I've put a video of it here. I have also noticed that when parked if I blip the throttle the speedo reads non-zero and the "Parking Brake" warning comes up, as the car thinks it is moving. Often when driving and on overrun, the speedo reads 0, whereas when I have any throttle on at all it reads a flickering set of random numbers.
I had replaced several of the bulbs in the instrument cluster, so I took that out again and reseated both connectors. I also had a look behind the panel by the steering wheel. What is going on here? This does not look like a factory wiring job!
It looks like the thick red wire on the left has been removed from somewhere and the connector is taped up. Then a thick green wire has been spliced into either the yellow or orange wire and fed, via a fuse, into a relay, along with another thick red wire that comes out of the fusebox. A thin black wire comes from the relay, via another fuse, and disappears down the side behind the carpet.
I don;t think the dodgy wiring is connected to the speedo fault as it has been there since I got the car, so, I have two questions:
1) How to get the speedo working again - none of the posts I have found on here seem to have exactly these symptoms
2) What should I do about the wiring?
Thanks for your help