Investigation in the Auto Lights/Auto Wipers today.
I took the time to inspect the connector on the passengers B pillar, that joins the body loom to the roof loom on connector C389. It is an 8-pin connector. The normal layout of pins is:
1 - Interior Lamp Battery Saver Supply
2 - Interior Lamp GEM Light supply
3 - Interior Lamp GND
4 - Rain Sensor Power
5 - Intrusion Sensor Power
6 - Intrusion Sensor Signal/Trigger
7 - Rains Sensor Signal
8 - Sensor GND
The roof loom in the XR4 is quite sparse. Only pins 1, 2 and 3 are present. BUT, the body loom has all bar the 2 x Intrusion Sensor lines. Which means I can confirm it already has the Rain Sensor lines in it. I may have said this earlier, but today we have confirmation.
Body loom C839 connector in behind the left A-Pillar cover:
You can just see the pins identified as 1, 4, 5 and 8 on this body-loom connector:
Luke