One problem related to wiring has been reported for the 2011 BMW X3. The most recently reported issues are listed below.
Vehicle electrical system has failed due to corrosion in wiring harness from leaking rear wiper fluid line. The wiper fluid line is bundled together inside the vehicle wiring harness. Wiper fluid line defective at time of vehicle assembly. Design engineering blunder to package a fluid line inside an electrical harness. Root cause for failure is manufacturer aware of the problem and have issued a service bulletin but manufacturer unwilling to repair under warranty due to lapsed warranty period not mileage criteria. Problem identified at 24,779 miles. More detailed description is attached. Vehicle safety systems, driving stability systems, cruise control function, have been compromised and do not function. Diagnostics systems and warning lights all stay lit on the dash. No way to tell if any of the electronic systems, emission systems, sensors and actuators are working properly.