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E90 General Vehicle Electrical
Roof Functions Center (FZD)
For the interior lighting system, the Roof Functions Center represents the interface to the
Footwell Module since both control modules are connected to the K-CAN. For instance,
the FZD can receive instructions to switch the interior lighting on or off via the K-CAN
from the FRM. The FZD is the link to the rear interior lighting unit.
The interior lighting functions in the Roof Functions Center are:
• Switching the interior lighting on/off on request from the Footwell Module
• Reading the signals from the interior light buttons and transferring them to the
Footwell Module
Terminal 58g
The Roof Functions Center receives the terminal 58g signal from the Footwell Module via
the K-CAN and activates the lighting in the buttons.
Junction Box Electronics Control Module (JBE)
The JBE is responsible for switching the luggage compartment and glove compartment
lighting on and off by providing the ground connection for the lighting system.
Luggage Compartment Lighting
The status of the trunk lid contact changes when the trunk lid is opened manually or via
the remote control/ID Transmitter, which causes the signal to go to a low level. The JBE
evaluates this signal and switches on the luggage compartment lighting.
The status of the trunk lid contact switch changes when the trunk lid is closed again, this
causes the signal to go to a high level and the JBE switches off the luggage compart-
ment lighting.
The JBE also switches on the luggage compartment lighting when the trunk lid is
opened from the inside by pressing the button on the A-pillar.
Glove Compartment Lighting
Opening the glove compartment operates a microswitch that switches on the glove com-
partment lighting.
Car Access System 2 (CAS2)
The CAS2, serves as the master control module for the Central Locking System and
issues the enable signal to activate/deactivate central locking which in turn transmits a
signal, via K-CAN, to the FRM requesting the illumination of the interior light.
As soon as the CAS2 receives a request to unlock/lock, the signal is checked whether it
is valid and belongs to the vehicle. Only if the check is successful will the CAS2 forward
the request to lock/unlock via JBE plus activate interior lighting via the FRM.
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