61 35 910 Removing and installing/replacing control unit of electronic immobilizer

WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with 61 35 ... Notes on ESD protection (Electro Static Discharge) .

Necessary preliminary tasks:

Disconnect battery negative lead, see 61 20 900 Disconnecting and connecting battery negative lead
Remove trim panel for pedal assembly, see 51 45 185 REMOVING AND INSTALLING/REPLACING TRIM FOR PEDAL ASSEMBLY .

Unfasten plug connection (1) and disconnect.

NOTE: Secure control unit of electronic immobilizer (3) against falling out.

Release screws (2) and remove control unit of electronic immobilizer (3).

Fig 1: Unfastening Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement:

IMPORTANT: Check hardware version of old control unit.
Part numbers of control units with hardware version HW03:

61 35 8 374 957
61 35 6 905 666
61 35 6 905 667
61 35 6 905 670

If hardware version HW03 was fitted, observe the following.

Disconnect cable from pin 3 of plug.

Replace double flat spring contact with a larger one.

Connect cable to pin 2 of plug.

Fig 2: Identifying Plug Connector Pin

Courtesy of BMW OF NORTH AMERICA, INC.

Carry out programming/coding, see Vehicle programming and coding .