BMW 3 (E46). Manual — part 235
Table a. Definition of hydraulic system terms
Term
Action
Notes
Hydraulic system at zero
pressure
Turn ignition to 0 position.
Wait 15 seconds.
Hydraulic system has no or
very low pressure.
Untensioned state
Mechanical (emergency)
actuation
Open or close top by hand.
See
Emergency operation
Closed system
All hydraulic lines connected.
Even short-circuiting of lines
is possible.
Function test
Open and close top several
times (min. 3 times).
Check hydraulic unit fluid
level and top up if necessary.
Refer to Operating
Instructions.
Short circuit
Unfasten quick release
coupling.
Connect supply and return
lines to each other.
Hydraulic system cannot
build up pressure.
Convertible top can be
moved.
Table b. Convertible top hydraulic system repair procedures
Operation
Procedures
Mechanical (manual)
operation of top
Ignition must be turned off
Hydraulic lines must be disconnected. (Reconnect
when finished)
After repeated actuation, system fluid is pumped into
supply tank of hydraulic unit. If hydraulic components
are replaced, there will be too much fluid in system.
Fluid level check
Stow convertible top and close storage compartment
Operation
Procedures
lid.
Follow directions in
Hydraulic fluid level, checking or
filling
, earlier in this group.
Fluid topping up or draining
541-3
Rollover Protection
System
Two spring-loaded rollbar cassettes are
mounted behind the rear seat. The
cassettes are bolted into the reinforced
carrier behind the seat backs. When
retracted they are covered by the rear
headrest which incorporates a flap at
the back, that will open when the
rollbars deploy.
A rollover sensor, mounted in the rear
behind the left rear seat back on the
rollbar cassette, contains the
electronics for rollover detection and
deployment final stage for triggering
the rollover bar solenoids. Two
capacitors are installed for rollbar
deployment in case of a power failure
during a crash.
The rollover sensor performs a
self-check every time the ignition is
switched on. The sensor is connected
to the diagnostic link (DLC) for
troubleshooting purposes.
If faults are detected, the warning lamp
in the instrument cluster will light up. In
case of a crash, the system will attempt
to trigger the rollover cassettes to
deploy even if a fault code is stored in
fault memory.
Note:
Diagnosis of convertible top and
Rollover Protection System are beyond
scope of this book. Your authorized
BMW dealer has proper diagnostic
equipment and tools to carry out these
tasks.
After deployment, the detent pawl in a
rollover protection cassette can be
retracted by pulling the reset lever
forward so that rollbar can be pushed
down and locked into the solenoids.
WARNING!
Ensure that area above and adjacent
to rollover bars remains clear and
unobstructed at all times.
CAUTION!
It is not possible to close
convertible top with rollover
bars extended.
If a hardtop is mounted, be sure
to install the protective rollover
bar covers provided with
hardtop to prevent damaging
rear window in case of
deployment.
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