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 DIS (Diagnosis And Information System)
Courtesy of BMW OF NORTH AMERICA, INC.

Installation Location Of Individual Components:

In Luggage Compartment On Right Side:

Fig 2: Identifying Components In Luggage Compartment On Right Side

G03293115

Courtesy of BMW OF NORTH AMERICA, INC.

In Luggage Compartment On Left Side:

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

Checking Fluid Level In Hydraulic Unit:

Necessary Preliminary Tasks:

Remove right luggage compartment wheel arch trim. Refer to 51 47 161 REMOVING AND INSTALLING/REPLACING RIGHT LUGGAGE COMPARTMENT WHEEL ARCH TRIM .

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: Locating Hydraulic Unit Retaining Nuts

G03293116

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 Marking

G03293117

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 Fluid Level In Hydraulic Unit

G03293118

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). Refer to 51 24 660 CORRECTING FLUID LEVEL IN HYDRAULIC UNIT (FROM 02/2003) FOR REAR LID ACTUATION (ELECTROHYDRAULIC-FULLY AUTOMATIC) .