Part 2

61 02 04 (091)
Roof control panel
E70, E81, E87, E90, E91, E92, E93

Continued from Part 1

System functions
In the basic variant, the following lights draw their power supply from the roof control panel:

- Interior light, front
- Rear interior light
- > E70
Reading light
These lights are activated via the footwell module (FRM).
In the high variant, the FZD control unit controls the following functions:
- Reading lamp
- Interior lighting and top-light:
Data transmission only from the buttons to the footwell module and from the footwell module to the lights (see below)
- Sliding/tilting sunroof (except for Panorama glass sunroof E91)
- Master for rain-light sensor or rain-light solar sensor
- Self-diagnosis
- The FZD control unit is the gateway (i.e. the data interface) for the following components and functions:
- Gateway between K-CAN and LIN bus
- Gateway for condensation sensor
- Gateway for Check Control
- Gateway for the electrochromic interior mirror and for the electrochromic exterior mirrors
The roof control panel can therefore be considered to have 3 functions:
1. The roof control panel is an installation location for other components.
2. The FZD control unit controls some functions.
3. For a number of other functions, the FZD control unit acts as a gateway.
All of the above system functions are described in detail below.
1. The roof control panel is simply the installation location for the following components:



Indicator lamp for passenger airbag deactivation
The installation of an indicator lamp for passenger airbag deactivation depends on the equipment fitted and on the national version.
The roof control panel is the installation location of the indicator lamp for passenger airbag deactivation.

> E81, E87, E90, E91, E92
The indicator lamp for passenger airbag deactivation is actuated by the MRS control unit (MRS = "multiple restraint system").

> E70, E93
The ACSM safety system is employed on E70, E93 vehicles (ACSM = "Advanced Crash Safety Module", also known as "crash safety module").
The indicator lamp for passenger airbag deactivation is actuated by the crash safety module.



Emergency call button
Although the emergency call button is installed in the roof control panel, there is no electrical connection between it and the panel. The emergency call button is directly connected to the telephone control unit.
Depending on the equipment fitted, the telephone control unit is the TCU or the ULF (TCU: Telematic Control Unit; ULF: universal charger and hands-free system).



Microphone
If a telephone has been installed, the two microphones for the telephone will also have been installed in the roof control panel. The two microphones are directly connected to the respective telephone control unit.
> E93
The microphone is located on the steering column.

Note: From 09/06, only 1 microphone is to be fitted. This change will be introduced gradually through the various model series.
The installation location of the microphone in the FZD depends on the national version (LHD or RHD). That means: On LHD vehicles, the microphone is installed on the left. On RHD vehicles, the microphone is installed on the right.

2. The FZD control unit in the roof control panel controls the following functions:



Controlling the reading lamp
The FZD control unit evaluates the buttons for the reading lamp and activates the reading lamp.



Control of interior lighting and top-light
For the control of the interior lighting and the top-light, the FZD control unit simply transmits data to the footwell module. The interior lighting and top-light are controlled as follows:
- Interior light
- When the interior-light button on the roof control panel is pressed, the FZD control unit sends a corresponding message to the footwell module.
- The footwell module sends a "Switch ON" or "Switch OFF" request to the roof function center control unit.
- The FZD control unit sends the "Switch ON" or "Switch OFF" request to the interior lights.

The interior lighting is subject to the following regulations:
- Overrun of interior lighting: Depending on the encoding, the interior lights are switched on for a while after terminal R is switched off. The message is sent from the footwell module.
- Dimming: The interior lighting can be switched on dimmed or immediately at full illumination intensity. The message is sent from the footwell module when the interior-light button is pressed. The dimming settings are controlled by the FZD control unit.
- Controlling the power supply: The power supply for the interior lights is controlled by the FZD control unit with pulse-width modulation in order to compensate for voltage fluctuations in the vehicle's system.
- Consumer shutdown: The footwell module switches the entire interior lighting off when the "Consumer shutdown" message is sent on the K-CAN. This message is transmitted when the charge state of the battery is poor to maintain the battery's ability to start the vehicle for as long as possible, or for a defined time after terminal R is switched OFF.

- Top-light
The top-light comes on automatically when Terminal R is switched on, along with the parking lights.
Signal path: CAS (Car Access System) -> FRM (footwell module) -> FZD (roof control panel) -> LEDs for top-light
The FZD control unit simply transfers data from the FRM control unit to the top-light LED display.



Sliding/tilting sunroof control
> E70, E81, E87, E90, E92
The FZD control unit is responsible for controlling the sliding/tilting sunroof.
The FZD control unit controls the sliding/tilting sunroof as follows:
- The FZD control unit evaluates the signals from the sliding/tilting sunroof switch.
- The FZD control unit actuates the sliding/tilting sunroof drive.
> E70
The FZD control unit controls 2 drives.
- The FZD control unit receives the signals from the two Hall sensors regarding the position of the sliding/tilting sunroof.
> E70
The FZD control unit also receives the signals from the two Hall sensors via the position of the sliding visor and the wind deflector.
- The FZD control unit executes the convenience closing request for the sliding/tilting sunroof (e.g. from the comfort access CA).
The requests of the comfort access reach the FZD control unit via the K-CAN.
> E91
The E91 with Panorama glass sunroof (option 402) has a separate SHD control unit.
On these vehicles, the FZD control unit evaluates the sliding/tilting sunroof switch.
The FZD control unit sends the "Open", "Close", etc. requests to the FZD control unit. The roof control panel control unit sends appropriate CAN messages to the sliding/tilting sunroof control unit (via the K-CAN).



Master for rain-light sensor or rain-light solar sensor
The FZD control unit provides the rain-light sensor or rain-light solar sensor a bus connection to the K-CAN.
This enables the following messages and requests to be sent:
- Switch position of the wiper switch or button for intermittent operation, depending on the rain-light sensor or rain-light solar sensor
- Position of the thumbwheel for setting the sensitivity of the rain-light sensor or rail-light solar sensor (selection of interval stage for rain sensor with wipers in intermittent operation)
- Status of wipers: The signal from the reset contact in the wiper motor is transmitted via the FZD control unit to the rain-light sensor or rain-light solar sensor.
- "Switch dipped-beam headlights on" prompt from rain-light sensor or rain-light solar sensor to footwell module: If the rain-light sensor or rain-light solar sensor detects that it is dark, the dipped-beam headlights will come on automatically (if the light switch is in switch position "A" = "Automatic driving lights control").

3. The FZD control unit in the roof control panel (High variant) is the data interface for the following components and functions:



Gateway between K-CAN and LIN bus
The FZD control unit is the data interface for the rain-light sensor or rain-light solar sensor between the K-CAN and the LIN bus.



Gateway for condensation sensor
The FZD control unit operates as a data interface for the condensation sensor as follows:
- The FZD control unit receives the signals from the condensation sensor via the interior mirror connector.
The signals from the condensation sensor are pulse-width-modulated. The signals indicate the relative moisture on the inside of the windshield.
- The FZD control unit converts the signals from the condensation sensor into digital messages for the K-CAN.
- The IHKA control unit receives these messages via the K-CAN. The demisting program is started accordingly.



Gateway for Check Control
The roof control panel issues Check-Control messages providing information about the sliding/tilting sunroof.
- Anti-trap circuit
- Loss of normalization following mechanical actuation: If the sliding/tilting sunroof has been moved mechanically using the emergency actuating unit, the tilted end stop must be taught in again (normalization).
[for further information, please refer to SI Technology (SBT) 61 08 03 030]



Gateway for the electrochromic interior mirror and for the electrochromic exterior mirrors
The FZD control unit is the data interface between the electrochromic interior mirror, K-CAN and electrochromic exterior mirrors.
The electrochromic exterior mirrors are controlled as follows when a request is sent via the electrochromic interior mirror:
- The electrochromic interior mirror sends a signal to the FZD control unit.
- The FZD control unit evaluates the signal and converts it into a percentage value (the percentage by which the exterior mirrors are to be dimmed).
- The FZD control unit sends this percentage value to the footwell module (FRM) via the K-CAN.
- The footwell module (FRM) sends the "Dim electrochromic exterior mirrors" request to the driver's door switch block.
- The driver's door switch block forwards the request to the electrochromic exterior mirror electronics. The electrochromic exterior mirrors are dimmed accordingly.

For safety reasons, the electrochromic mirrors are not dimmed when reverse gear is engaged.
- If the vehicle has a manual transmission, the reverse-light switch will send a signal to the footwell module. The message is forwarded to the FZD control unit from the footwell module via the K-CAN.
If the vehicle has an automatic transmission, the FZD control unit will receive the message "Reverse gear engaged" from the EGS control unit (via the K-CAN).
(EGS: Electronic transmission control; SMG: Sequential manual transmission)
- The electrochromic mirrors are not dimmed until the reversing manoeuvre has been completed.

Preconditions for activation
The FZD control unit is active under the following conditions:

- Terminal R ON, or
- Terminal 15 ON and
- K-CAN active
If none of these 3 conditions is met, the FZD control unit will switch to sleep mode
and can be woken up by pressing the buttons for the interior lighting.

Operation
This section describes:

- How to switch the interior lighting on and off
- How to set the sensitivity of the rain-light sensor or rain-light solar sensor



How to switch the interior lighting on and off
The interior lighting is switched on and off using 3 buttons:
- Interior-light button: The interior-light button switches both the front-compartment interior lights and the rear-compartment interior lights on and off.
- Button for reading light on driver's side and button for reading light on passenger side:
The button only ever switches the reading lamp on that side on and off.



Setting the sensitivity of the rain-light sensor or rain-light solar sensor
The rain-light sensor consists of a driving light sensor and a rain sensor.
The rain-light solar sensor comprises a driving light sensor, a rain sensor and a solar sensor
The driving light sensor measures the surrounding brightness outside the vehicle. Depending on the sensitivity of the driving light sensor, the dipped headlight will come on at dusk or when it goes dark ("Automatic driving lights control" option).
The sensitivity of the driving light sensor can be set as follows:
- On vehicles without CID (Central Information Display)
On vehicles without CID (Central Information Display), the sensitivity of the driving light sensor is encoded via the BMW diagnosis system.
- On vehicles with CID (Central Information Display):
The sensitivity of the driving light sensor can be set directly in the vehicle using the controller (in the Central Information Display).

Notes for service staff
The following information is available for service staff:

- General note: ---
- Diagnosis:
- Encoding/programming:

Japanese national version
The roof control panel creates the earth connection for the interior mirror with electronic toll function.

Subject to change.