51 24 ... Notes On Automatic Rear Lid Actuation (Electrohydraulic-Fully Automatic)

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IMPORTANT:

Adhere to conditions of absolute cleanliness when working on the opened hydraulic system. Even the smallest of dirt particles in the hydraulic system can cause malfunctions.

Function description and check:

Refer to DIS (Diagnosis and Information System)

Fig 1: Identifying Diagnosis And Information System

Courtesy of BMW OF NORTH AMERICA, INC.

Installation location of individual components:

In luggage compartment on right side:

REAR LID MODULE
HYDRAULIC UNIT
Proportional valve on (2)
ANGLE TRANSMITTER on right rear lid hinge

In luggage compartment on left side:

HYDRAULIC CYLINDER on left rear lid hinge

Fig 2: Identifying Proportional Valve, Hydraulic Unit And Rear Lid Module
Courtesy of BMW OF NORTH AMERICA, INC.

Checking fluid level in hydraulic unit:

Necessary preliminary tasks:

Remove RIGHT LUGGAGE COMPARTMENT WHEEL ARCH TRIM

E67 only:

Remove additional trim panel.

Test requirements:

Open rear lid (motor-driven) once and close again, this bleeds the system.

Open rear lid again (motor-driven).

Unscrew nuts (1).

Remove holder and pull out hydraulic unit (2).

Disconnect plug connections (3).

4 Hoses

5 Cable holder

Fig 3: Identifying Cable Holder, Hoses And Plug Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Hold hydraulic unit with drive (1) all round vertically upwards.

When rear lid is fully opened (cylinder retracted), fluid level (2) must be in area (A) of marking (3).

Fig 4: Identifying Fluid Level

Courtesy of BMW OF NORTH AMERICA, INC.

Correct measurement:

Set hydraulic unit (1) down on a horizontal surface (4).

Damper (3) and valve (5) must not rest on surface.

Check distance (B) from middle of marking (2) to lower edge of hydraulic unit (1).

B = 45±1 mm

Fluid level must be in area (A) of marking (2).

Fig 5: Identifying Damper, Valve And Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Correcting fluid level in hydraulic unit:

Electric motor must be removed from hydraulic unit to facilitate correction of fluid level.

Operation is described in:

CORRECT fluid level in hydraulic unit for rear lid actuation (electrohydraulic-fully automatic).