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

WARNING: This page is about a different car, the 2005 BMW 760i. 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:

In luggage compartment on right side:

Rear lid module See 61 35 196 REMOVING AND INSTALLING (REPLACING) CONTROL UNIT FOR AUTOMATIC REAR LID ACTUATION
Hydraulic unit See 51 24 150 REMOVING AND INSTALLING/REPLACING HYDRAULIC UNIT FOR REAR LID ACTUATION (ELECTROHYDRAULIC-FULLY AUTOMATIC)
Proportional valve on (2). See 51 24 149 REPLACING VALVE ON HYDRAULIC UNIT
Angle transmitter on right rear lid hinge. See 51 24 ... REMOVING AND INSTALLING/REPLACING ANGLE TRANSMITTER FOR REAR LID ACTUATION (ELECTROHYDRAULIC-FULLY AUTOMATIC)

In luggage compartment on left side:

Hydraulic cylinder on left rear lid hinge. See 51 24 151 REMOVING AND INSTALLING/REPLACING HYDRAULIC CYLINDER FOR REAR LID (ELECTROHYDRAULIC-FULLY AUTOMATIC)

Fig 2: Identifying Rear Lid Module & 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 Hoses & Cable Holder
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 Drive & 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 Hydraulic Unit, Damper & Valve

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)