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E90 General Vehicle Electrical
Footwell Module (FRM)
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 input signals for the interior lighting are listed in the following.
Switching-on Conditions
The interior lighting is switched on in response to one of the following conditions:
• Unlock via barrel lock in driver's door
• Unlock via remote control/identification transmitter
• Terminal R OFF when terminal 58g was ON
• Receiving crash signal
• Lock button on remote control/ ID transmitter pressed when the
central locking has been in central arrest state for longer than 10 s
• Interior lighting button pressed.
Switching Off Interior Lighting
The FRM receives numerous signals to switch off the interior lighting via the K-CAN or
are obtained indirectly by the FRM.
Input Signals From Input Signals From
Central Locking Signals
CAS2
Barrel Lock, Driver's Door
FRM
Crash Signal
MRS 5
Interior Light Switch
FRM/FZD
Door Contacts
FRM
Central Locking, Trunk Lid
JB
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