DTC B1974-46: Rear View Mirror Module - Calibration/Parameter Memory Failure: Action

NOTE: To validate the repair, activate the smart rear view mirror and drive the vehicle for at least 10 minutes on a standard road and check the smart rear view mirror function. Then check this DTC is no longer set within the body control module

Check the smart rear view mirror camera is not damaged or blocked. Rectify as necessary
Check the smart rear view mirror is securely mounted in the correct position. Rectify as necessary
Using the Jaguar Land Rover approved diagnostic equipment, clear the Diagnostic Trouble Code(s) and re-calibrate the smart rear view mirror camera. If the fault persists install a new smart rear view mirror camera as necessary