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E93 Complete Vehicle Workbook
Soft Close Automatic (SCA)
For convenient closing of the boot lid, the Soft Close Automatic is installed as standard. It consists of two Soft Close Automatic drives
that lock the boot lid to the rear module carrier on the left and right. This increases the stability of the boot area.
Opening the Boot Lid
When the boot lid is opened using the boot lid button, a microswitch is actuated and its status is read by the junction box JB. The JB
sends a message to the CAS via K-CAN. After the check is successfully completed, the CAS sends the release and the JB triggers the
drive for unlocking the boot lid. The drive actuates the release catch; the left and right boot lid locks are unlocked via the control cables.
The JB transmits the status of the boot lid (unlocked) on K-CAN, and the CTM receives it. The CTM then triggers the start-up of the
SCA drives, which then move to standby position and are available for a closing operation or to support a closing operation.
Closing the Boot Lid
When the boot lid is closed, the SCA drives are in standby position. When the left and right boot lid locks have reached the locking clips,
two microswitches are actuated and their status is read in by the CTM. The CTM then triggers both SCA drives (one on each SCA drive)
until two other microswitches signal the "boot lid locked" status to the CTM.
Manually closing the boot lid would make closing via the Soft Close Automatic drive unnecessary. However, because it must be ensured
that the boot lid is really closed, the Soft Close Automatic drive is actuated nonetheless. The end position of the SCA drives in the
"Unlocked" status is signalled to the CTM by two additional microswitches.
Non-repeat Lock
Each Soft Close Automatic drive has a “non-repeat” lock to prevent overheating of the Soft Close Automatic drive. It allows up to 20
actuations (counter up to 20 increments) of the Soft Close Automatic drive. Afterwards, the Soft Close Automatic drive is electrically
disabled for approximately. 2 minutes.
Summary of Contents for 3-series convertible
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