Learn more about the Footwell Module.
The Footwell Module (FRM) serves as:
• Gateway Module for communication between devices connected to
the LIN Bus and K-CAN (Outside Mirror & Drivers Switch Cluster).
• Evaluator of data from Door Contacts and Door Lock Cylinders
• Activator/controller of all Exterior Lights, Adaptive Headlights,
• Controller of Front Power Windows, Electric Load Shut-down
• Activation of Power Window Anti-Trap
• Stores the Vehicle Order information
Comfort Access functionality controlled by Footwell Module
The Footwell Module (FRM) monitors the hall sensors of the door contacts to determine
if a door is open or closed. CAS2 indirectly obtains the door status information and uses
the information to determine if an enable signal is to be provided to the JBE.
Signal Path: Door contact signals input to FRM; Door status signal from FRM to JBE via
K-CAN then forwarded from JBE via K-Can to CAS2.
Control Modules for Interior Lighting
The “interior lighting” function is distributed over several control module that communicate with each other via the K-CAN.
• Footwell Module (FRM) is responsible for switching the interior lighting on & off.
All interior lighting outputs of the Footwell Module are pulse-modulated to ensure that
the interior lighting functions are at a constant brightness level in the event of voltage
fluctuations. The pulse width modulation is also used for the soft ON/OFF function.
The Footwell Module features the following functions for the interior lighting:
• Switching the interior lighting on/off
• Electric load shut-down after 16 minutes
• Instrument lighting, terminal 58g
Switching on the Interior Lighting
The footwell module receives numerous input signals that switch on the interior lighting.
For instance, the input signals from the footwell module are read in directly or received via
the K-CAN.
The relays for the power window motors for the driver’s and passenger’s side are
installed in the Footwell Module.
The FRM is also involved in monitoring a number of other systems, like the sunroof, and others.
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