Footwell Module

Footwell Module
The footwell module in the R56 is an electrical intersection. The footwell module picks up the signals from the doors and controls the lighting. Moreover, the footwell module is also the interface to the instrument cluster.

Brief description of components
The footwell module is located in the footwell on the driver's side. The footwell module and the junction box electronics control the power window drives.












System functions
The footwell module processes the signals from the doors and controls the lighting. The footwell module is also the interface to the instrument cluster. Depending on the equipment version, the footwell module picks up the following signals:
- Height-level sensor
- Reversing light switch
- Brake light switch
- Hazard warning switch
- Light switch
- Switch block, driver's door
- Door contacts
- Driver's door lock

The following functions are controlled by the footwell module:
- Communication between the LIN bus and body CAN
- Storing vehicle order
- Exterior rearview mirror
- Exterior lights
- Interior lights
- Central locking
- Front power windows

Communication
The footwell module enables communication to take place between the LIN bus and the body CAN.

Storing vehicle order
The vehicle order is saved in the footwell module. The vehicle order enables the vehicle to be identified. Besides the type code number, the vehicle order contains all important equipment features on the vehicle.

Exterior rearview mirror
There are two equipment variations of the switch block in the driver's door:
- Basic version of the driver's door switch block
The switch block sends its signals directly to the footwell module.
- High version of the driver's door switch block
This switch block is connected to the LIN bus. The requests to adjust the exterior mirrors are sent via the LIN bus.

Exterior lights
The lighting functions are integrated into the footwell module. These lighting function are:
- Sidelights
- Low beam
- High beam
- Headlamp flasher
- Fog lamps
- Rear fog light
- Turn signals
- Hazard warning lights
- Brake light
- Reversing lights
- Parking light

Besides the lighting functions, other exterior lighting functions are also integrated in the footwell module:
- Light monitoring
- Headlight beam height control
- Emergency operating mode if the footwell module should fail
- Lamp replacement
- Home lighting
- Visual alarm after anti-theft alarm has been triggered
- Actuation of bi-xenon headlamps

All lighting functions except the additional brake light are activated with pulse-width modulated signals by the footwell module. These pulse-width modulated signals enable a uniform brightness of the exterior lighting.

Interior lights
on vehicles without a roof control panel, the footwell module actuates the interior lighting in the roof area directly. All footwell module outputs for interior lighting are pulse-width modulated. With standard equipment, the interior lighting comprises the following components:
- Front interior light
- Luggage compartment lights
- Glove compartment lighting
- Footwell lighting

The following components can also be installed as optional extra for the interior lights:
- Rear interior light
- Courtesy lighting

Central locking
The footwell module evaluates the status of the Hall sensors in the door contacts. When the vehicle is locked or unlocked with the mechanical key element, the footwell module will recognize this request. The footwell module sends a message on the body CAN to the Comfort Access.

Power windows
The footwell module and the junction box electronics activate the power-window motors. The relays for the front power window motors are located in the footwell module.

Notes for Service department
The following information on the footwell module is available for service staff:

Notes on encoding / programming
Nearly all Car and Key Memory functions are programmed inside the vehicle itself.

No liability can be accepted for printing or other faults. Subject to changes of a technical nature.