DTC B1146-15: Passive Sounder Supply - Circuit short to battery or open: Action

NOTE: To validate the repair attempt to lock the vehicle with a side door ajar and listen for the error tone emitted from the passive sounder, then using the Jaguar Land Rover approved diagnostic equipment check that this DTC is not set within the body control module

Refer to the electrical circuit diagrams and check the passive sounder circuit for short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary