DTC B1974-49: Rear View Mirror Module - Internal Electronic 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

Refer to the electrical circuit diagrams and check the harness connections to the smart rear view mirror module. Repair as necessary
Using the Jaguar Land Rover approved diagnostic equipment, clear the Diagnostic Trouble Code(s) and retest. If the fault persists, install a new smart rear view mirror module as necessary