Bron:
http://www.bravo-guide.co.uk/fix-a-bravo.htm
Ticking Rear Wiper
Connections
1. Check the connection strikes are clean and that the boot closes properly
2. It may be the motor. These were very cheap on the MK1's and it may need replacing.
No Rear Wiper Spray
Loose Pipe
Most common cause of this is the pipe that carries the water has come off the pipe at the nozzle. Fiat will charge £30 to fix this as it is not covered by warranty. Take off the rear panel, re-fix the pipe and secure with glue. See the picture sequence below.
1. Undo the 4 retaining screws
2. Carefully prize the panel off. The white prong things are clips, each one of these is in a plastic shroud but will comeout.
3. Undo the 10mm wiper blade retaining nut.
4. Undo the three 5mm Allen bolts that hold the wiper motor.
5. When the unit is free it is obvious where the feed plugs in...
6...so plug it in. You can add a little glue to help prevent it again.