Carrying out a system check of the telematics control module emergency battery

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 BMW M5, 2022 BMW M5, 2021 BMW M5, 2020 BMW M5, and 2019 BMW M5. 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