I did a bit of research on this. The auto light switch and the RLSS (rain/light sensor) aren't expensive. It was hard finding the correct wiper stalk with the auto function and these cost a fair bit more. Not sure if you can use the existing wiper stalk. The buttons look the same but the icon on the stalk is different obviously.
Coding will be required but this is straightforward.
The loom involves connecting the RLSS to the overhead module using a short 3 wire loom, again, if you can find the correct loom it should be plug and play.
However the hardest part is the windscreen. Costly to replace the windscreen, but I doubt the RLSS would work correctly otherwise.
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if I've helped - an Appreciate would be, er, very appreciated!
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