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

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

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 DIS
Courtesy of BMW OF NORTH AMERICA, INC.

Installation location of individual components:

Components in luggage compartment on right side:

Rear lid module
Hydraulic unit
Proportional valve on (2)
Angle transmitter located on right rear lid hinge

Components in luggage compartment on left side:

Hydraulic cylinder located on left rear lid hinge

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

Checking fluid level in hydraulic unit:

Necessary preliminary tasks:

Remove right luggage compartment wheel arch trim . See 51 47 161 REMOVING AND INSTALLING / REPLACING 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 Plug Connections

G04779501

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 Hydraulic Unit With Drive

G04779502

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 Hydraulic Unit, Damper And Valve

G04779503

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:

Correcting fluid level in hydraulic unit for rear lid actuation (electrohydraulic-fully automatic). See 51 24 660 CORRECTING FLUID LEVEL IN HYDRAULIC UNIT FOR REAR LID ACTUATION (ELECTROHYDRAULIC-FULLY AUTOMATIC) .