How do the intermittent wipers work? Why is there is no timer setting...
The control unit is in the steering column.
The first "electronic" wiper to be used on a production car. (Citation needed)
On the intermittent setting, it "reads" the resistance between the wiper blade and the windscreen and adjusts the interval accordingly. When the screen is wet, there is very little resistance and so the bi-metal strip does not heat up and the circuit is left intact (so the wipers continue working nonstop). When the screen becomes dryer, the resistance increases, thus sending more current through the circuit and thus heating the bi-metal strip which breaks the circuit and stops the wipers until it cools down and starts the wiper again.