Battery Monitoring System Control Module
| ITEM | DESCRIPTION |
|---|---|
| 1 | BMS control module startup battery negative terminal clamp |
| 2 | BMS control module |
| 3 | Wiring harness connector |
| 4 | BMS control module terminal for the BMS plate |
The BMS control module is located on the startup battery negative terminal. The BMS control module is clamped to the startup battery negative terminal with a bolt and nut. The BMS control module has a ground terminal for the ground cable connection secured with a nut.
The ground cable connects to a vehicle body ground connection.
The BMS control module has a single 2-pin connector to the wiring harness. The 2-pin connector has the following electrical connections:
- Positive startup battery feed directly from the startup battery positive terminal.
- Local Interconnect Network (LIN) hardwired to the BCM /GWM .
The BCM /GWM controls the startup battery current drain and State of Charge. The BMS control module measures the startup battery current and voltage, which it 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 control module, the BCM /GWM controls the output from the DC/DC . The BCM /GWM requests that specific modules are switched OFF to decrease electrical loads when necessary.
The BMS control module contains software maps that provide a mathematical model of startup battery conditions. The BMS control module constantly receives information from the BCM /GWM regarding the vehicle state and electrical loading.
When you install a new startup battery on the vehicle, you must calibrate the BMS control module with the JLR approved diagnostic equipment.
- Always make sure the battery clamps are installed correctly as this can cause miscalculations by the BMS.
- Due to the self-calibration routine, it is a must that all power supply diagnostic testing is done using the JLR approved diagnostic equipment.
When an error occurs, the BMS control module 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.
The JLR approved diagnostic equipment has a process for an automated power supply diagnostic procedure. The procedure provides a menu driven process to locate a fault in a logical sequence. The procedure uses the capability of the BMS control module and the LIN of generator controlled functions to provide current flow information. The procedure uses the controlled functions of the following, to provide current flow information:
- BMS control module through the LIN.
- DC/DC through the High Speed (HS) CAN power mode zero systems bus.
For additional information, Refer to: MHEV BATTERY AND CABLES