BMW X5: Replacing Control Unit (DME)

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection).

Necessary preliminary tasks:

• Switch off ignition
• Disconnect battery negative lead.
• Remove microfilter housing.

IMPORTANT: Follow instructions for removing and installing electronic control units.

Replacement:

• Carry out programming/coding.

IMPORTANT: It is absolutely essential to read out the fault memory with the MoDiC or the BMW DIS and to create a fault memory printout.

Switch off ignition.

Lever out expander rivet.

Remove gasket (1).

Release screws (2).

Feed out partition (3) and remove.

Fig. 24: Identifying Expander Rivet Gasket And Screws

Lever out expander rivet.

Release locks in direction of arrow.

Feed out fresh air duct (1) and remove.

Fig. 25: Removing Fresh Air Duct

Open retainers.

Release lock (1) in direction of arrow.

Remove cover (2).

Fig. 26: Locating Retainers Lock And Cover

Release screws and remove retaining bar (1).

Unlock upper section (2) of partition seal in direction of arrow and remove.

Release grommets (3) for wiring harnesses from lower section of partition seal and from electronics box.

Installation:

Make sure grommets are correctly seated (watertightness).

Fig. 27: Unlocking Upper Section Of Partition Seal

Unlock plugs (1) using slide in direction of arrow and remove. Remove control unit (2).

Installation:

Replacement: Note device identification number and coding.

Fig. 28: Identifying DME Control Unit

NOTE: Check stored fault messages. Now clear the fault memory.

REMOVING/REPLACING KNOCK SENSORS (N52, N52K, N51)

IMPORTANT: Aluminum-magnesium materials.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

• Read out fault memory of DME control unit
• Switch off ignition
• Disconnect battery negative lead.
• Remove intake air manifold.

IMPORTANT: Mixing up the knock sensor plug connections will result in engine damage! Routing of wires and plug connections must conform to the original routing.

This eliminates the risk of confusion and mix-ups.

Release screws on both knock sensors. Remove knock sensors (1).

Installation:

Replace aluminum screws.

Tightening torque 12 14 1AZ.

Fig. 29: Identifying Knock Sensors

Installation:

Clean support face of knock sensors on engine block.

NOTE: Check stored fault messages.

Now clear the fault memory.

CODING CONTROL MODULE (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Coding" program.

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units:

• EWS (electronic immobilizer)
• DME (Digital Motor Electronics) or
• DDE (Digital Diesel Electronics)

Refer to "Diagnosis and Coding" service information bulletins on subject of coding.

PROGRAMMING CONTROL UNIT (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Programming".

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units:

• EWS (electronic immobilizer)
• DME (Digital Motor Electronics) or
• DDE (Digital Diesel Electronics)

Refer to "Diagnosis and Coding" service information bulletins on subject of programming.

REMOVING AND INSTALLING/REPLACING ELECTRONICS BOX

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection).

NOTE: Follow instructions for removing and installing electronic control

Necessary preliminary tasks:

• Read fault memory.
• Disconnect negative battery cable.
• Remove electronics box fan.
• Remove distribution box (passenger compartment).
• Release control unit holder.

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

Release screws (arrows).

Disconnect wiring harness on engine compartment side on right.

Remove electronics box.

Installation:

Make sure gasket (1) is correctly seated on electronics box. Add final details to vehicle.

Read fault memory.

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