Home › Land Rover › 2016 › LR4 Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Driver/Passenger Door Control Module (DDM/PDM) -- LR4/L319 › Diagnostic Trouble Code Index DTC: Driver/Passenger Door Control Module (DDM/PDM) › Description And Operation › DTC B1C39-29: Key Lock Switch - Signal invalid › Possible Causes