if you have: Self-level susp. inactive or dead radios

[_XS3C_]

If you have Self level suspension inactive message or not working radio you might have drainage problems around the panoramic roof !
Check the following SIB:SIB 54 06 06

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There have been plenty of reports of 2001-2006 series E53 BMW X5s with panorama roofs suffering from symptoms of dead radios and self-leveling suspension inactive error messages. When these occur after your beloved X5 has been through rain or a similar drenching, then it could be the result of drainage problems around the panoramic roof.
This has been acknowledged by BMW in their service bulletin SIB 54 06 06.

Causes acknowledged by BMW include:
A. Obstructed or damaged drains or drain tubes.
B. Void in the windshield urethane bead.
C. Excessive gaps between the glass panels and the perimeter seal.
D. Inadequate water management system in the sunroof cassette.
BMW had supposedly implemented an improved assembly for the panoramic roof in October of 2005 that was supposed to correct this problem. This sunroof cassette, as BMW calls it, is also available for retrofit into the affected vehicles.
In the worst-case scenario, it has been found that the water will travel through the inside rear posts and subsequently flood the compartment that contains the battery, the self-leveling module, the radio module (600$ for a used replacement) and a couple of other control modules. The water level may rise to the point where it will short out the battery as well as the rest of the electronic components in that compartment. Should you discover that compartment full of water, you can try disconnecting the battery immediately and drying out the modules for a couple of days before attempting to use those systems again.
A quick self-test that you can do is to pour water around the sunroof, ensuring that the water, and plenty of it, gets into the gutters where they can trickle down the front and rear drains. Observe the front part of the headliner for droplets or water stains. Check the compartment where the battery and control modules are and observe if there is a trickle of water anywhere in the compartment. The presence of water in that compartment necessitates a visit to your dealer, who may or may not correct the problem at their own cost. DIY types can attempt to fix the problem on their X5 by downloading the Service Information Bulletin.