Where are the CAS modules in your vehicle? The FRM is located in the left (US driver's) lower A-pillar by one's foot. The trunk area has other modules, none of which respond to water well. I mean, if either of these or countless other modules or systems were wetted, who knows what havoc could be unleashed.

__________________
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim