Rain Sensor Challenge with a Jeep Grand Cherokee
A friend recently ran into an issue with a fully loaded 2014 Grand Cherokee with a rain sensor. He reported that after the new windshield was installed, the wiper swiped once every time the vehicle was started, and that when it rained the wiper did not change frequency and/or speed. His team had worked on several of these vehicles in the past and did not have a similar incident.
They took the vehicle to the dealer, where the dealer checked several on-lot vehicles and found that none of them had the same issue. The dealer contacted Chrysler Technical Services and discovered that the system needed resetting.
My friend told me by email, “In the scan tool there was an option asking if the RS had been removed or replaced. (By the way: I don’t think our auto glass tech unplugged it, rather he un-clipped it from the bracket on the windshield and left it hang.) When ‘yes’ was selected the scan tool the system began resetting door locks, electro mirror, adaptive cruise and many other functions, including the ‘rain sensing windshield.’ After that was complete, the wipers performed normally.”
The charge for this service is about $50 to $75 per reset. The reset covers similarly-equipped vehicles from 2013 and up.
The unclear point in this story is that others have not had a similar problem when the glass was replaced. The tech in this case did not disconnect the rain sensor so interruption of the electrical circuit is not the cause.
My theory is that any Chrysler vehicle with multiple Advanced Driver Assist Systems (ADAS) included in its features, requires this reset/recalibration. I think that all ADAS circuits are interrelated and need rebooting. I would be interested to hear from those that have had a similar experience and how they handled it.