Battery Monitoring Sensor
- Always make sure the battery clamps are installed correctly as this can cause miscalculations by the BMS.
- When you install a BMS on the vehicle, you must use the battery replacement routine with the JLR approved diagnostic equipment.
- When you install a new startup battery on the vehicle, you must calibrate the BMS with the JLR approved diagnostic equipment.
| ITEM | DESCRIPTION |
|---|---|
| 1 | BMS terminal for the ground cable connection |
| 2 | Startup battery negative terminal clamp |
| 3 | Startup battery |
| 4 | Wiring harness connector |
| 5 | BMS |
The BMS is located on the startup battery negative terminal. The BMS is clamped to the startup battery negative terminal with a bolt and nut. The BMS has a ground terminal for the ground cable connection, secured with a nut. The ground cable connected to a vehicle body ground connection.
The BMS has a single 2-pin connector to the wiring harness.
The 2-pin connector has the following electrical connections:
- A 12V power supply directly from the startup battery positive terminal, through a fusible link.
- Local Interconnect Network (LIN) connection to the BCM /GWM.
The BMS monitors the positive and negative current, voltage and temperature to maintain correct operation of the 12V systems.
The BMS communicates to the BCM /GWM on the LIN. The BCM /GWM transmits the startup battery information over the Controller Area Network (CAN) systems buses to other vehicle systems. Based on the information received from the BMS , the BCM /GWM controls the output from the generator and request the switching off of electrical loads if necessary.
The BMS contains software maps that provide a mathematical model of startup battery conditions. The BMS constantly receives information from the BCM /GWM regarding the vehicle state and electrical loading.
When an error occurs, the BMS sends a message to the BCM /GWM through the LIN. The DTC is stored in the BCM /GWM. The DTC is read using the JLR approved diagnostic equipment.