I have an 03 4.2L and the wipers have never worked properly since I bought it. Starting to diagnose it now and need some help understanding if I have rain sensing or not. How can I tell?

 

The sensor is in the interior rear view mirror stem and visible through the glass from outside the vehicle.

Where fitted, rain sensing wiping will be initiated when the vehicle is running and not in PARK or NEUTRAL gear selection. The wiper switch must be in the AUTO position.

I've had this feature on all my recent Jaguars and leave it OFF because it initiates wiping before there is sufficient rain on the glass to avoid scratching. One of a growing list of "features" I don't require with each successive model.

Graham

 

Thanks GGG!
My "problem" is that they don't operate on anything but high. Except... after driving for an hour or so in the rain they work normally. Also they don't park in the home position at all.
Thus far I put new relays in and it made zero difference.
On Sat I'll next measure power at the motor. (hopefully its just motor cause thats cheap)

 

If I recall correctly, there is a switch in the wiper assembly that signals to the control unit that the arms are in park position. You might want to check for this while troubleshooting.

 

Will do. Thanks!