If salt water gets into the X5 through the door sill and the carpet is spongy wet then there is 100mm of water sitting in the lower floor pan, wiring loom, computer modules, speakers etc are all house in this area.

Even if you replaced the damaged modules BMW will not warranty the car anymore as corrosion sets in and the pins & plugs fail, there would always be something going wrong. Fresh water now that a different story as corrision is not as big a factor.

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X5 M50d White | 20" Rims | Adaptive Drive, Self-Lvl Susp | Act/Steer | HUD | Xenon, Adapt Lights | H-Beam Ast | Rear/Side Camera | Panorama S/roof | Auto Tailgate | Comfort, Active, Ventilated, Heating, Lumbar, Navada Perforated Leather Seats | Comfort Access | M-Steer Wheel w Pdle Shift |Sports 8-Speed | Active Crus Stop/Go | Proff Nav + TV, DAB | 16 Spk Ind Audio | USB |Internet-eMail-SMS-Apps | 4 Zone Air | Speed D/play | Towbar | 20% Tint | 5mm Castor Bushes | Yellow Calipers, Ceramic Pads |