Autel MaxiDiag MD808 Pro support Battery System Testing,include:evaluate the battery charge state, monitor the close-circuit current, register the battery replacement, activate the rest state of the vehicle, and charge the battery via the diagnostic socket.And this post show the guide on how to use Autel MD808 to perform these function mentioned above.
Here take BMW as an example:
Select BMS icon on the Service screen, choose BMW from the vehicle make screen and select the correct vehicle model to enter the Power supply (Battery) menu.
Select Battery option from the previous screen, the next screen displays as below.
Part 1.Evaluate the battery charge state
Part 2.Monitor the close-circuit current
Part 3.Register the battery replacement
Part 4.Activate the rest state of the vehicle
Part 5.Charge the battery via the diagnostic socket
Evaluate State of Battery Charge
This function is used for reading the measured data from the power management system, determining the status of the battery charge, and displaying the battery charge status histogram.
Select Evaluate state of battery charge in the Battery menu.
A screen displays as below:
To display the battery charge status of the last 5 days:
Press OK to open the next screen, select [1] to view the charge state of last 5 days. Or press OK to exit.
Read carefully the information on the screen and press OK to continue.
Check the determined battery charge status and press OK to end the service function.
To display the battery charge status histogram:
Press [2] to display the battery charge status histogram.
Read carefully the notice on the screen and press the OK button to continue.
Check the battery charge status histogram and press the OK button to end the service function.
Register Battery Replacement
This option allows displaying the mileage reading of last battery replacement, registering the battery replacement after replacing a new battery and informing the power management system that a new battery has been fitted to the vehicle.
If the battery change is not registered, the power management system will not function properly, which may not provide the battery with enough charging power to operate the car and limit the functions of individual electrical consumers.
To display the battery history:
Select Register battery replacement in the Battery menu.
Follow the on-screen instructions and press [1] to display the battery history.
Read carefully the information on the display and press OK to continue.
Check the battery capacity and the battery replacement information on the screen.
Press [1] to return to the selection screen or press [2] to end the service function.
To register the battery replacement:
Press [2] to continue.
Press the corresponding function buttons and follow the on-screen instructions to perform the desired registration functions.
Close-circuit Current
The close-circuit current should always be measured if increased current consumption is suspected. Battery will discharge at a relatively fast rate even current consumption rates slightly above the normal.
Evaluate Close-circuit Current Monitoring
Use the UP/DOWN scroll button to select Close-circuit current option from the Power supply (Battery) menu and press the OK button.
Select Evaluate close-circuit current monitoring button to display the last 24 close-circuit current values.
Use the UP/DOWN scroll button to read the complete information and press OK to end this service function.
Activate Rest State
Power Down Command
This function can be used to place electronic control units in sleep mode within a short time.
Select Activate rest state option from the Power supply (Battery) menu.
Select the Power down command on the next screen to shut down electronic control units or select ESC to exit without change.
A screen will appear for your confirmation, press Yes to send the Power Down Command, or press No to exit this function.
After the command is sent, follow the instructions on the screen and press OK to continue.
Press OK to end the service function.
Charging Battery via Diagnostic Socket
This function can delete the transport mode of the control unit and allows the battery charging via the OBDII port.
Use the UP/DOWN scroll button to select Charging the battery via diagnostic socket option from the Power supply (Battery) menu and press the OK button.
Read carefully the instructions on the screen and press the OK button to continue.
Press [1] and press the OK button to delete the transport mode of the control unit.
After deleting the transport mode, an “Activation Successful” message will appear on the screen, press the OK button to end service function.
Auxiliary Battery
This function is used for 24V EPS auxiliary battery history displaying and auxiliary battery replacement registration.
Use the UP/DOWN scroll button to select Auxiliary battery (24V EPS):
Register battery replacement option from the Power supply (Battery) menu and press the OK button.
Read the instructions on the screen with the UP/DOWN scroll button.
To display the battery history:
Press [1] to display the history of the last auxiliary battery replacement.
The screen will display the history information of the auxiliary battery.
Press the OK button to end service function.
To register the battery replacement:
Press [2] to register the auxiliary battery replacement.
Read carefully the Help information on the screen and press the OK button to continue.
Press [Yes] if the newly installed battery is an original BMW component:
Press [Yes] if there is a data matrix code on the label of the newly installed battery.
Enter the data matrix code as described and save.
If the entered code beyond the limited character length, an “Input Overflow!” warning message will appear on the screen.
Press [Finish] to complete input and if the information on the screen is correct, press [Yes] to continue.
The tool will begin the registration of the battery replacement.
When the auxiliary battery replacement has been registered
successfully in the EPS, the screen will display as below:
Press the OK button to end the service function.
Note:If the registration is failed, press the OK button and try again.
