12 90... Removing and installing/replacing electronics box

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection) , see 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

NOTE: Follow instructions for removing and installing electronic control units

Necessary preliminary tasks:

Read fault memory.
Disconnect battery negative lead , see 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove electronics box fan , see 12 90 100 Replacing fan for electronics box .
Remove distribution box (passenger compartment) , see 61 13 050 REMOVING AND INSTALLING/REPLACING FUSE BOX IN PASSENGER COMPARTMENT .
Release control unit holder

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

Fig 1: Identifying Rubber Grommets Out Of Electronics Box

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (arrows).

Disconnect wiring harness on engine compartment side on right.

Remove electronics box.

Fig 2: Identifying Electronics Box And Engine Compartment Side

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 Electronics Box Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement (E70 - Security):

Pay attention to engine compartment protective features .