Removing the control unit holder
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:
Working on 12 V electrical system
.
Risk of short circuits! Risk of fire!
Risk of short circuits! Risk of fire!
- Make sure that there is no charger connected to the jump start terminal in the engine compartment.
- Detach battery ground lead from battery.
- For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
NOTE:
RISK OF DAMAGE
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .
- Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.
Preliminary work
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
- Refer to REMOVING SUSPENSION STRUT BRACE .
- Refer to REMOVING THE COVER FOR THE DME CONTROL UNIT .
- Refer to REMOVING THE DME CONTROL UNIT .
- Refer to REMOVING THE INTEGRATED SUPPLY MODULE (PDM) PARTIALLY .
- Unlock plug connection (1) and disconnect.
- Unlock connector (2) and disconnect it from control unit bracket (5).
- Unlock plug connection (3) and disconnect.
- Unlock connector (4) and disconnect it from the control unit bracket (5).
- Loosen the clamp (arrow).
- Unlock plug connections (1) and disconnect.
- Unlock the locks (1).
- Guide out the connector (2) in the arrow direction and set it to the side.
- Unlock the lock (arrow).
- Disconnect the cable holder (1) upwards from the control unit holder (2).
- Loosen clamp (1).
- Unlock the locks (2).
- Guide out the cable bracket (3) in the arrow direction and set it to the side.
- Loosen screws (1).
- Guide the control unit holder (2) up and out and remove.