Startup Battery And Cables (G2367144): Overview: Notes

The startup battery supplies electrical power to the Battery Junction Box (BJB). The BJB connects to the following components through the startup battery busbar:

Starter motor
- For additional information, refer to: STARTING SYSTEM
Direct Current to Direct Current (DC/DC) converter
- For additional information, Refer to: DIRECT CURRENT TO DIRECT CURRENT CONVERTER
Jump start terminal - Positive.

The DC/DC converter supplies the power for normal operation of the 12V systems only in Power Mode 7 (engine running) through the startup battery busbar.

The BJB supplies power to the following:

Engine Junction Box (EJB)
Auxiliary Junction Box (AJB)
Body Control Module/Gateway Module (BCM/GWM)
Passenger Junction Box (PJB)
Rear Junction Box (RJB).

The Battery Monitoring System (BMS) control module is mounted on the startup battery Negative terminal. The BMS control module is connected to the vehicle body ground by a ground cable mounted on the BMS control module. The BMS control module sends startup battery data to the BCM/GWM. When a new startup battery is installed to the vehicle, the BMS control module requires re-calibrating using a Jaguar Land Rover (JLR) approved diagnostic equipment.

CAUTION: When connecting a slave startup battery to the vehicle, always use the vehicle body ground terminal in the engine compartment. Never connect directly to the startup battery ground terminal, because the Battery Monitoring System (BMS) control module can be damaged.

The Body Control Module/Gateway Module (BCM/GWM) is the main controller of the vehicle body systems. The BCM/GWM contains the whole charging system software required to control the startup battery charging system and components. The BCM/GWM monitors the components and can store fault related Diagnostic Trouble Codes (DTCs).

The electrical power to:

Charge the startup battery
Provide the power for the 12V vehicle electrical system.

The electrical system is provided by the Direct Current to Direct Current (DC/DC) converter. The DC/DC converter provides electrical power to support the 12v system in Power Mode 7 (engine running). The output voltage of the DC/DC converter is controlled by the BCM/GWM. The DC/DC operating mode is controlled by:

Vehicle Supervisory Controller (VSC) or
Powertrain Control Module (PCM).

For additional information, Refer to: DIRECT CURRENT TO DIRECT CURRENT CONVERTER

NOTE: The fusible links are mounted behind a removable cover.

The Battery Junction Box (BJB) is located on the left side of the loadspace behind the trim panel. The Engine Junction Box (EJB) is located in the rear left of the engine compartment. The Passenger Junction Box (PJB) is mounted on the passengers side behind the glovebox next to the BCM/GWM. The Rear Junction Box (RJB) is located on the left side of the loadspace behind the trim panel. The EJB, PJB and RJB contain fuses and relays to distribute electrical power to various vehicle systems.

The 2 jump start terminals are located adjacent to the right side top mount in the engine compartment. A cover protects the Positive terminal when not in use. When jump starting is required, the cover must be removed and the Positive jump lead attached securely. The cover must be installed to the Positive terminal when not in use. The Negative jump lead is attached to a stud located on the right side top mount.