5 Series E39 520i (M52TU) TOUR
Anti-repeat device:
An anti-repeat device is fitted to prevent the hydraulic control unit
from overheating.
The total motor running time of the hydraulic control unit is
recorded by a counter. If the motor is not activated, this counter is
reduced by a third of the pause time. A new actuation will not be
accepted if the counter exceeds a total running time of 2 minutes.
Thus, for a motor running time exceeding 2 minutes, an enforced
pause which is three times as long is engaged.
After a cooling-down period of 6 minutes, it is again possible for
the motor to run for 2 minutes.
Note:
However, an actuation which is in operation is not terminated even
if the maximum running time is exceeded.
Installation location of individual hydraulic parts:
Hydraulic cylinder:
The hydraulic cylinder (2) is located on the left rear lid hinge
between the gas spring struts for rear window (3) and rear
lid (1).
Trunk lid module and hydraulic control unit:
The hydraulic unit is located on the left side in the luggage
compartment in the spare wheel recess and to the left of it is the
rear lid module.
The hydraulic unit is activated by the rear lid module.
A tilt sensor is fitted underneath the rear lid trim,
refer to Removing tilt sensor for automatic rear lid actuation.
Emergency rear lid operation:
If the automatic facility fails, the rear lid can be opened and closed manually without the need for supplementary
measures.
The force need for emergency operation is greater.
Emergency operation is determined by:
-
the switching pressure of the emergency valve (mechanical/hydraulic pressure limiting valve),
-
the fluid is forced out of the lines during the first two actuations and
-
the friction by the hydraulic cylinder from the third actuation.
RA Instructions for automatic rear lid actuation (electrohydraulic/fully automatic)
BMW AG - TIS
06.02.2013 22:22
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 2 -