34 52 121 Removing and installing/renewing ICM control unit

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2017 BMW M6, 2017 BMW 650i xDrive, 2017 BMW 650i, 2017 BMW 640i xDrive, and 2017 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .

WARNING: The sensor system for triggering the airbag is installed in the ICM control unit.
The battery must be disconnected before removing the ICM control unit (ICM control unit de-energized).
There is a risk of the airbag being triggered inadvertently if this requirement is disregarded.

Necessary preliminary tasks:

Disconnect NEGATIVE BATTERY CABLE .
Remove CENTER CONSOLE assembly.

WARNING: Make sure that the negative battery lead is disconnected.
There is a risk of the airbag being triggered inadvertently.

Undo nuts (1) and raise ICM control unit (2).

Release plug connection (3) and remove ICM control unit (2).

Installation note:

Replace self-locking nuts.

Tightening torque 34 51 2AZ .

IMPORTANT: Do not trap any electrical wires when installing ICM control unit.

Fig 1: Identifying ICM Control Unit, Plug Connection And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

After removing and installing ICM control unit:

After the repair work has been completed with the diagnosis system:

carry out ADJUSTMENT/START-UP OF ICM CONTROL UNIT

After replacement of the ICM control unit:

Vehicles built before 03/2012:

Perform "Conversion replacement ICM" (vehicle order is changed)
Accept action plan with the control units to be programmed/encoded and, if necessary, enabled.
Note the reworking list:
Carry out ADJUSTMENT/START-UP OF ICM CONTROL UNIT

Carry out RIDE HEIGHT ADJUSTMENT

On vehicles from 03/2012:

After completing repairs, use BMW Diagnosis and Information System to