3/7/2007. 2006 VOLVO X90. CONTACT HAS A REAR BACK UP SENSOR AND SIRRIUS RADIO AND BLUETOOTH PHONE INSTALLED CONTACT STATES THAT THE REAR SENSOR WOULD GO OFF FOR LONG PERIODS WHEN NOTHING WAS VISIBLY NEAR THE VEHICLE. *MC THE CONSUMER STATED THAT SOMETIMES THE REAR BACK UP SENSOR WOULD NOT RESPOND AT ALL WHEN AN OBJECT WAS NEAR THE VEHICLE. THE CONSUMER STATED HE STRUCK A WOODEN POLE THAT WAS INVISIBLE THROUGH THE REAR VIEW OR SIDE MIRRORS. THE DEALER INFORMED THE CONSUMER NOTHING WAS WRONG WITH THE SENSOR, BUT THERE WAS A 20 SECOND DELAY AFTER IGNITION START UP. IT WAS NEVER MENTIONED TO THE CONSUMER THAT THE BLUETOOTH WOULD OVERRIDE THE SENSOR NOR WAS HE TOLD ABOUT THE 20 SECOND DELAY. *JB