Necessary preliminary tasks

• Read fault memory.
• Disconnect battery negative lead. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
• Remove ELECTRONICS BOX FAN 
• Remove distribution box (passenger compartment). See 61 13 050 REMOVING AND INSTALLING/REPLACING INTERIOR FUSE BOX
• Release control unit holder

Pull rubber grommets out of electronics box. Disconnect all plug connections.

Fig 1: Identifying Rubber Grommets

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (arrows).

Disconnect wiring harness on engine compartment side on right.

Remove electronics box.

Fig 2: Locating Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Make sure gasket (1) is correctly seated on electronics box.

Add final details to vehicle.

Read fault memory.

Fig 3: Identifying Electronic Box Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement (E70 - Security):

Pay attention to engine compartment protective features.