I have a 2020 GDi Plus 4 and have discovered the wiper delay isn't working. A garage has had a look and tell me I need to replace the wiper stalk as it's faulty. I believe it's the Lucas STC4016.

Before I do that can anyone tell me exactly how the circuit works? I can see there is a wiper relay fitted - is the timing for the delay controlled by the wiper stalk, the relay or something else in the ECU?

I'm thinking the wiper stalk is just a simple on/off switch that activates the delay elsewhere in the circuit?


Roadster 3.7
Plus 4 110 Anniversary
Plus 4 Fiat TC