DTC B11DB-01: Battery Monitoring Module - General electrical failure: Action

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2015 Jaguar XKR-S, 2015 Jaguar XKR, 2014 Jaguar XKR-S, 2014 Jaguar XKR, and 2013 Jaguar XKR-S. However, it is still accessible from the selected car via links, so may be relevant.

Refer to the appropriate electrical circuit wiring diagrams and check charging system for faults. Perform any repairs required
Refer to the appropriate electrical circuit wiring diagrams and check the battery monitoring system module circuit for open circuit, short circuit to ground, short circuit to power
Refer to the appropriate service information and the battery care manual BATTERY AND CHARGING SYSTEM - GENERAL INFORMATION -- XK/X150 , inspect the vehicle battery and ensure it is fully charged and serviceable before performing further tests.