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

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

NOTE: Follow instructions for REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS

Necessary preliminary tasks:

Read out fault memory
Disconnect BATTERY EARTH LEAD
Remove MICROFILTER HOUSING
Remove TRAILING LINK ON SPRING STRUT DOME on right

Release screws (1).

Slacken nut (2).

Lift out right heater end panel (3).

Installation note:

Ensure gasket (4) is correctly seated.

Fig 1: Lifting Out Right Heater End Panel

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Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 2: Removing Control Unit Cover

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Release plug connection (2), fuse carrier (3) and wiring harness grommet (4) from electronics box (1) in upward direction.

Installation note:

Make sure wiring harness grommets (4) are correctly seated in electronics box (1).

Fig 3: Identifying Fuse Carrier, Wiring Harness Grommet From Electronics Box

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Unlock DME control unit from holder (1) and raise slightly.

Pull tab (3) in direction of arrow out of housing and disconnect plug connections (2) from DME control unit.

Fig 4: Disconnecting Plug Connections From DME Control Unit

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If necessary, press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 5: Pulling Contact Carrier Out Of Housing

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If necessary, press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 6: Pressing Locking Tab

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Unlock equipment holder (2) on holder (1) and remove.

Remove DME control unit (3).

Fig 7: Removing DME Control Unit

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Unlock equipment holder (2) on holder (1) and remove.

Fig 8: Identifying Equipment Holder On Holder

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Remove equipment holder (1) from electronics box.

Fig 9: Identifying Equipment Holder From Electronics Box

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Release screws (1).

Replacement:

Modify water drain valve (2) and bump stop (3).

Fig 10: Identifying Water Drain Valve, Bump Stop, Screws

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Installation note:

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

Fig 11: Identifying Electronics Box Seal

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