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E90 General Vehicle Electrical
Footwell Module (FRM)
The Footwell Module monitors the door contacts for the anti-theft alarm system. In the
event of a change in the status, the FRM sends this information via the K-CAN, thus
allowing the USIS to trigger the alarm.
Junction Box Electronics Control Module (JBE)
The Junction Box Electronics Control Module monitors the trunk lid status in the central
locking system. In the event of a change in the status, the JBE sends this information via
the K-CAN, thus allowing the USIS to trigger the alarm.
Car Access System 2 (CAS2)
The Car Access System 2 monitors the status of the hood contact switch. If the hood
contact switch sends a signal, the CAS2 sends the corresponding information via the
K-CAN and the USIS triggers the alarm.
Functions of the Anti-Theft Alarm System
The anti-theft alarm system can be armed and disarmed at terminal 30. It is not possible
to arm the anti-theft alarm system at terminal R or terminal 15.
Arming the Anti-Theft Alarm System
The anti-theft alarm system is armed from the driver's door lock barrel or by means of the
remote control, together with the vehicle central arrest function. The following phases are
implemented:
• Directly after arming
- Emergency current siren is armed and monitors its voltage supply
- Anti-theft alarm system starts monitoring of the DWA bus
- If the emergency current siren does not confirm the armed status, the DWA LED
flashes to signal this status
• 3 sec. after arming
- Door contacts, trunk lid and hood contact switches are adopted in the alarm table
3 sec. after they have signaled the "closed" status
Faulty contacts are entered in the information memory and interpreted as closed
but not adopted in the alarm table. They are not included in the evaluation for alarm
triggering.
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