Replacing the emergency battery for the telematics control module
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.
WARNING:
Pyrotechnic components.
Danger! Immobilization period-threatening injuries!
Danger! Immobilization period-threatening injuries!
- All work on pyrotechnic parts may be carried out by technically experienced and appropriately trained personnel only.
- Replace any damaged part or ones that have been dropped.
- For additional information see: 72 00 SAFETY REGULATIONS ON HANDLING COMPONENTS WITH GAS GENERATORS .
NOTE:
RISK OF DAMAGE
Fold the headlining.
Damage to the headlining. If necessary, the headlining must be replaced.
Fold the headlining.
Damage to the headlining. If necessary, the headlining must be replaced.
- Carry out tasks with a second person to assist.
- Support the headlining at the front and back.
Preliminary work
- Refer to DEACTIVATING THE 48 V ELECTRICAL SYSTEM .
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
- Refer to TRIM OF THE 3RD BRAKE LIGHT .
- Refer to REMOVING INTERIOR ROOF LIGHT .
- Refer to REMOVING RIGHT C-PILLAR TRIM PANEL LEFT AND RIGHT .
- Refer to PARTIALLY RELEASING THE REAR LEFT AND RIGHT SIDE TRIM PANEL .
- Refer to REMOVING THE B-PILLAR TRIM PANEL AT LEFT AND RIGHT .
- Refer to PARTIALLY LOWERING THE REAR HEADLINING .
- Unlock and open battery compartment (1) on telematic control unit (2).
- Feed the emergency battery (1) out of the battery compartment and replace it.
Parts: Emergency battery
- Shut battery compartment (1) on telematics control unit (2) and lock.
Follow-up work
- Refer to PARTIALLY INSTALLING THE REAR HEADLINING (LOWERED) .
- Refer to INSTALLING THE LEFT AND RIGHT B-PILLAR TRIM PANEL .
- Refer to PARTIALLY INSTALLING THE REAR LEFT AND RIGHT SIDE TRIM PANEL .
- Refer to INSTALLING THE LEFT AND RIGHT C-PILLAR TRIM PANEL .
- Refer to INSTALLING INTERIOR ROOF LIGHT .
- Refer to TRIM OF THE 3RD INSTALLING THE BRAKE LIGHT .
- Refer to CONNECTING ALL BATTERY GROUND LEADS .
- Refer to ACTIVATING THE 48 V ELECTRICAL SYSTEM .