12V Battery And Power Outlets Description And Function

12 V Battery and Power Outlet Components: 

Technical Description: 

12V Battery 

The 12V battery is located in the back of the front trunk compartment, on the passenger side and behind the front trunk tub. It is accessible for inspection by a service flap.

The low voltage electrical system works with an operating voltage of 12 volts.

The 12V battery is used to power the high voltage battery relays. This allows safe disconnection of the high voltage system for servicing or in the event of an accident.

The 12V system also powers the vehicle's communication network and most of the non-drive related electrical vehicle functions.

The battery has a capacity of 5 Ah and is charged by the high voltage system via the DC/DC converter of the 3-in-1 module. The negative battery terminal is equipped with the 12V battery sensor (BAS), which monitors the battery voltage and SOH. The pre-fuse box for high current fuses is attached to the positive terminal.

When the battery is charged, the open circuit voltage is generally between 12.5-13.8V. If the voltage is under 9.6V when tested, the battery needs to be replaced. If the voltage is below 12.4V, the battery should be charged. Use a multimeter to measure the internal resistance of the battery: normally it should be about 7.5mΩ.

USB Ports 

The vehicle is equipped with five USB ports:

Two USB Type-A ports are located under the infotainment touch screen in the center console. The port on the driver's side can be used to transfer data (i.e. play music, connect Android Auto & CarPlay) and charge devices, the port on the front passenger side can be used only for charging (capable of fast charging).

Three USB ports are located in the rear of the center console below the A/C vents. The two on each side are USB Type-A and one in the center is USB Type-C. The two USB Type-A ports (capable of fast charging) are for charging devices, and the single USB Type-C port (90 W PD) is for charging as well.

Power Outlet 

The vehicle is equipped with a power outlet located on the right-hand side of the rear luggage compartment. To access the low voltage outlet, remove the protective cap. The power outlet is suitable for accessories requiring up to 12V (120 W) max.

Wireless Charger 

The wireless charger provided in the front console of the vehicle can charge Qi compatible devices wirelessly, providing an output of up to 15W. To charge a Qi compatible device, place the device on the charging pad, which will start charging the device.

The wireless charger can be set to "On/Off" depending on the user's requirements. The charger is equipped with LIN, which enables it to show charging status and phone messages in the infotainment touchscreen. It also reminds the user if the phone is left behind in the car (phone forget reminder).

Example of Schematic Diagram: 

Pre-fuse box 12V power distribution 

Courtesy of VINFAST, LLC

12V and USB power outlet 

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WLC wireless charging 

Courtesy of VINFAST, LLC

Operation: 

External Charging 

1. 9. Disconnect battery's "-" terminal.
2. 10. Disconnect battery's "+" terminal.
3. 11. Connect an appropriate charger, select 12V and the correct charging program for sealed lead-acid batteries.
4. 12. Connect the "+" output of the charger to the "+" terminal of the battery, which is located under the fuse cover.
5. 13. Connect the "-" output of the charger to the "-" terminal of the battery.
6. 14. Turn on the charger.

   Jump starting (process for connecting jumper cable) 

7. 15. Ensure vehicle is off and in Park (P).
8. 16. Open the hood.
9. 17. Locate the 12V battery.
10. 18. Connect the red jumper cable to the positive (+) battery terminal of your vehicle.
11. 19. Connect the other end of the red jumper cable to the positive (+) battery terminal of the assisting vehicle.
12. 20. Connect the black jumper cable to the negative (-) battery terminal of the assisting vehicle.
13. 21. Connect the other end of black jumper cable to the negative (-) battery terminal of your vehicle.
14. 22. Start the assisting vehicle first, and then proceed to start your vehicle.

    Jump starting (process for disconnecting jumper cable) 

15. 23. Disconnect black jumper cable from the negative (-) terminal of your vehicle.
16. 24. Disconnect the other end of the black negative (-) jumper cable of the assisting vehicle.
17. 25. Disconnect the red jumper cable from the positive (+) terminal of the assisting vehicle.
18. 26. Disconnect the other end of the red jumper cable from the positive (+) terminal of your vehicle.

    Turn on/off wireless charging & phone forget reminder 

19. 27. Launch "Settings" app from home screen.
20. 28. Scroll down on the side menu to find the "Vehicle Settings" tab.
21. 29. Tap on the "Vehicle Settings" tab to open.
22. 30. Tap on the "Wireless charging" tab in vehicle settings.

    Courtesy of VINFAST, LLC

23. 31. To turn wireless charging on/off, toggle on the switch.
24. 32. To turn "Phone-forgot reminder" on/off, toggle on the switch.

If there is a fault in the wireless charging system, a corresponding warning will be shown as a notification on the infotainment screen, e.g.:

Courtesy of VINFAST, LLC