C'est bon j'ai retrouvé ce qu'il fallait faire (en anglais sorry) :
Use Address Book & SEC Together [/misc] [#] (14:03)
Version 1.0 of SEC has been disabled from working when the Bluetooth functionality of Address Book is turned on since this has been known to cause problems. But, if you insist on using them together, here's the method as laid out by Jonas.
1. Quit System Preferences
2. Kill the "Sony Ericsson Clicker Helper" application. Use the Process Viewer to do this.
3. In the terminal, write (all on one line):
defaults write com.salling.SonyEricssonClickerHelper ServiceUUID
"0000110300001000800000805f9b34fb"
4. Launch System Prefs and activate the Clicker pane to restart the helper app.
To go back to the old behavior, replace step 3 with (again, all on one line):
defaults remove com.salling.SonyEricssonClickerHelper ServiceUUID
Please be aware that the bluetooth serial drivers hooked up to the Dial-up Network service of the phone will crash the machine if SEC is active when using them (from, say Internet Connect or any other serial-port app)