Home >> Land Rover >> 2017 >> Discovery Sport SE >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Infotainment Master Controller/Infotainment Slave Controller (IMC/ISC) -- Discovery Sport/L550 >> Diagnostic Trouble Code Index DTC: Infotainment Master Controller/Infotainment Slave Controller (IMC/ISC) >> Description And Operation >> DTC B1520-13: Auxiliary Fan Relay Control Line - Circuit open >> Possible Causes