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E90 General Vehicle Electrical
Location of Control Modules
Footwell Module (FRM)
The footwell module is located in the left hand A-pillar. It evaluates the status of the door
contacts and reads the Hall sensor signals from the lock barrel in the driver's door and
transfers the information via the Junction Box Electronics Control Module to the Car Access
System 2.
Car Access System 2 (CAS2)
The Car Access System 2 is installed to the left of the steering column. The CAS2
assumes the master function for the Central Locking System, it has the exclusive system
authorization and is simply supported by the other control modules.
Junction Box Electronics Control Module (JBE)
The Junction Box Electronics Control Module is integrated in the front power distribution
box. The JBE contains the relays for activating the central locking drive modules. The
trunk lid is operated via a power output stage. The signals from the outer trunk lid button
and center-lock button are also sent to the JBE and transferred to the CAS2.
The remote control receiver is powered by the Junction Box Electronics Control Module.
Index Explanation Index Explanation
1
Footwell Module (FRM)
3
Junction Box (JB)
2
Car Access System 2 (CAS2)
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