Home >> Land Rover >> 2013 >> Range Rover HSE >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Audio Amplifier Module (AAM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Audio Amplifier Module (AAM) >> Description And Operation >> DTC B13E7-12: Microphone 4 - Circuit short to battery >> Possible Causes