Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Driver/Passenger Seat Module (DSM/PSM) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Driver/Passenger Seat Module (DSM/PSM) >> Description And Operation >> DTC B1B91-31: Seat Tilt Motor Speed/Position Sensor - No signal >> Possible Causes