Fault Memory Storage - BMW 1999-2005 M3 Service Manual

Convertible Top
7 of 11
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/5...

Fault memory storage

Convertible Top Module (CVM II) fault
memory is stored in NVRAM. Up to 16
fault codes can be stored in order of
occurrence. A distinction is made
between permanent and sporadic faults.
If a fault occurs during raising or
lowering the top, all top movement will
cease and a fault code will be stored in
memory. Then the emergency closing
procedure must be followed.
Depending on the location and type of
the fault, it may be possible to raise or
lower the top fully by pressing the switch
in the opposite direction.
If the top switch is held on more than 20
seconds after the top is completely
raised or lowered, a fault code will be
set. CVM II assumes a fault to ground in
the switch or electrical harness. The
ignition switch must then be cycled OFF
- ON to clear the fault before the top will
function again. The fault will remain in
memory until cleared with a scan tool
(DIS, MoDiC or equivalent).
All sequenced movements of the
convertible top have time-out limits
preset in CVM II. If a time-out occurs
before the end position is reached,
movement will be switched off to prevent
damage to any of the top components.
Note:
The temperature sensor in the
convertible top system signals CVM II to
2/25/2009 11:05 PM