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E90 General Vehicle Electrical
Alarm Trigger
Door Contact Signals
The status of the door contacts is evaluated by the FRM and signaled to the USIS. The
status of the individual door contacts is adopted in the alarm table 3 sec. after the status
signal "door closed" is received by USIS. This means that an alarm can be triggered via a
door that is already closed even if another door contact is still open.
The FRM evaluates the Hall sensors and makes this information available via the K-CAN
to other bus users.
Trunk Lid
The status of the trunk lid contact switch is evaluated by the JBE and signalled to the
USIS.
Initially, signals from the trunk lid contact switch, USIS are blanked out in the alarm table
when the trunk lid is unlocked while the anti-theft alarm system is armed. The signals are
also blanked out when the trunk lid is unlocked with the remote control with the anti-theft
alarm system armed. The trunk lid contact switch is re-adopted in the alarm table 3 s
after closing the trunk lid. The initialization procedure for the ultrasonic passenger com-
partment sensor and tilt alarm sensor is started if another door or the trunk lid is no longer
open.
Hood
The status of the hood contact switch is evaluated by the CAS2 and signalled to the
USIS. The status of the hood contact switch is adopted in the alarm table 3 sec. after the
"hood closed" status message. If not engaged, the CAS2 interprets the hood contact
switch as closed.
Note: A hood contact switch that was not coded correctly in the CAS 2
produces an implausible signal. The implausible signal triggers a
false alarm.
Ultrasonic Passenger Compartment Sensor (USIS)
The USIS senses and evaluated movements in the vehicle interior. The initialization
procedure for the USIS is started 3 s after closing the hood, trunk lid and last door.
The USIS is operational 20 s after initialization and is adopted in the alarm table.
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