Carrying out a system check of the telematics control module emergency battery
WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
Precondition
Negative battery cables are disconnected.
- Start the following test module:
- "AT8400_SYSTEL2 - Check of telecommunications system"
- Run a system test.
- If necessary, remount and replace the emergency battery according to the test module instructions before installing the new telematics control module.
Replacement:
Parts: Emergency battery