This service provides repair files for the 48V lithium battery BMS of Audi A6 (C8), A7 (4K8), A8 (D5), Q7 (4M) and Q8 models manufactured between 2018 and 2024, covering part numbers 4N0915105, 4N0915105A, 4N0915105B, 4N0915105C, 4N0915105D, 4M0915105, 4M0915105A, 4M0915105B and 4M0915105C.
 
Compatible Programmers for File Reading and Writing
The repair files can be read and written using the following devices:
 
Freescale Programmer  or 
- VVDI Prog
- MultiProg
- CG Pro
- Any Motorola Freescale programmer that supports SPC5644B/MPC5644B chips
 
Critical Post-File Writing Instructions
After writing the provided repair file to the BMS, charge the battery to its maximum capacity
before reinstalling the BMS back into the battery pack. Failure to do so will cause the BMS to lock again.
2. To verify if the BMS has been successfully unlocked and is functioning properly, you need to test it using either the vehicle itself or a dedicated test platform. The test must confirm that the battery can be activated by the DC-DC converter. Note that a faulty DC-DC converter will be unable to activate the battery, which may lead to a misdiagnosis that the battery is the sole issue.
3. When the battery is in an inactive state, measuring the voltage at the external terminals (controlled by the BMS) with a multimeter will always show a reading of 0V. Once the battery is activated, the BMS will click once, and the external terminals will display a normal voltage reading—this applies whether the battery is tested inside or outside the vehicle.
 
-During working hours, the service is completed within a few minutes, ensuring fast and efficient processing.
  ps: After purchasing, click on the guide to watch the course according to the guide.Copyright Protection: This course contains proprietary technical data and field-tested strategies. As a virtual asset, it is non-refundable. We are committed to serving professionals who are serious about mastering Hybrid & EV repair technology