12 14 550 Replacing control unit (DME) (B38 hybrid powertrain)

Preliminary work needed: 

• Remove UPPER FIREWALL COVER .
• Remove VEHICLE BATTERY .

Replacement: 

• Carry out programming/coding
• If no data can be read out from the previous control unit, carry out injection quantity compensation (description at end of instructions).

Removal: 

Unlock and remove cover (1).

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Unlock and detach all connectors (1) in the arrow direction at the control unit.

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Unlock lock (2) and remove cover (1).

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Unlock the lock (2) and release the cable clip (1) and place to one side.

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Release the cable clip (2) from cover (1) and lay to one side.

Feed out cover (1) and remove.

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Loosen screw (1).

Loosen the equipment holder (2) in the arrow direction from the battery plate and pull it a bit towards the front.

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Unlock locks (1) and remove DME control unit (2) in upwards direction.

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Installation: 

Push the DME control unit (2) into the equipment holder until the locks (1) can be locked.

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Insert the equipment holder (2) in the arrow direction at the rear into the battery plate (3).

Tighten screw (1).

Tightening torque 12 90 1AZ .

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Lock the cover (1) in the lock (2).

Lock (2) must snap audibly into place.

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Connect all connectors (1) at the control unit in the arrow direction.

All connectors (1) must engage audibly.

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Lock the cover (1) in the lock (2).

Lock (2) must snap audibly into place.

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Feed in and install the cover (1).

Attach the cable clip (2) to the cover (1).

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Feed in the cable clip (1) and lock it in the lock (2).

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Required follow-up work: 

• Install VEHICLE BATTERY .
• Install UPPER FIREWALL COVER .

Attention! 

If the DME control unit has been replaced, it will also be necessary to reset the minimum quantity adjustment of the injectors! 

Reset minimum quantity adaptation: 

• Connect diagnostic system and follow the diagnosis instructions. 
• Read out vehicle data
• Identification without vehicle test
• Start vehicle test
• Vehicle handling
• Service functions
• Power train
• Engine electronics
• Adjustment programs
• Delete adaptations
• Reset adaptation values
• Resetting minimum quantity adaptations