Brief Description of Components

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





Brief description of components
- Basic variant on basic version
The basic variant of the roof control panel does not have its own control unit.
It comprises the following components:
- Interior light, front
- Rear interior light (not E93)
These two lights are activated via the footwell module.

- High variant
The High variant of the roof control panel has its own control unit. The FZD control unit (FZD: roof control panel).
The High version of the roof control panel contains the following components, depending on the equipment fitted and the national version:
- Interior light, front
- Reading light, front (for driver's side and passenger side)
- Rear interior light
- Reading light, rear (left and right)
- Switch for sliding/tilting sunroof
- Microphone for telephone and emergency call
- Emergency call button
- Indicator lamp for front-passenger airbag deactivation
- Ultrasonic interior motion sensor (E70 only)
> E81, E87, E90, E91, E92

> E93

> E70

The roof control panel is available in several colours to match the headliner. Due to the number of equipment specifications, there are a total of 62 variants of the roof control panel (E70: 68; E93: 4).
The following components send input signals to the FZD control unit in the High variant of the roof control panel:
- 3 interior-light switches
The interior light and the reading lights are switched on and off via 3 switches.
- Light switch
Switching Terminal R on and setting the light switch to switch position "A" or "2" also switches on the top-light.
- Sliding/tilting sunroof switch
The sliding/tilting sunroof switch is used to open and close the sliding/tilting sunroof and to tilt it upwards.
- Hall sensors in the sunroof drive
The Hall sensors in the sliding/tilting sunroof drive indicate the position of the sliding/tilting sunroof to the FZD control unit (in the roof control panel).
> E70, E91
The E70, E91 have 2 drives, each with 2 Hall sensors:
- 2 Hall sensors report the position of the glass sliding/tilting sunroof and the glass tilting roof (Panorama glass roof)
- 2 Hall sensors report the position of the sliding visor and the wind deflector.
> E91 with Panorama glass sunroof
The E91 with Panorama glass sunroof has its own control unit for the Panorama glass sunroof (SHD: sliding/tilting sunroof). The Hall sensors report to the SHD control unit.
[for further information, please refer to SI Technology (SBT) 61 12 03 055]
- Wiper/washer system
The position of the windscreen wiper switch is reported to the rain-light sensor or rain-light solar sensor via the FZD control unit. The rain-light sensor or rain-light solar sensor is activated by the "automatic wipe" button.
- Condensation sensor
> Only vehicles with IHKA: integrated automatic heating and air-conditioning system
The condensation sensor measures the moisture on the windscreen in the vehicle interior. The condensation sensor is able to detect condensation on the windscreen before it becomes visible.
The condensation sensor is only active in the automatic program.
The condensation sensor draws its power supply from the roof control panel.
The roof control panel evaluates the condensation sensor data.
The roof control panel sends appropriate data to the IHKA control unit (via the K-CAN).
On receiving this data, the IHKA control unit starts the windscreen demisting program.
[for further information, please refer to SI Technology (SBT) 64 01 04 090] 64 01 04 (090) Integrated Heating Control and Air-Conditioning System
- Electrochromic rear-view mirror
If a strong light beam hits the electrochromic interior mirror, the electrochromic interior mirror sends an analogue signal to the FZD control unit. The FZD control unit controls the dimming of the electrochromic interior mirror. The electrochromic mirror glass darkens.
In addition, the FZD control unit also converts the analogue signal into a CAN message. The CAN message is sent on the K-CAN, triggering the darkening of the electrochromic exterior mirror (optional equipment). The occupants of the vehicle are not dazzled by reflected light beams.
- Ultrasonic interior motion sensor
The ultrasonic interior motion sensor is a sensor for the anti-theft alarm system (DWA).
The ultrasonic interior motion sensor is able to detect movements in the vehicle interior via ultrasonic signals. If the anti-theft alarm system is activated and movement is detected in the vehicle interior, an alarm is triggered.
> E70
The ultrasonic interior motion sensor is integrated in the FZD control unit.
> E81, E87, E90, E92 and E91 without Panorama glass roof
The ultrasonic interior motion sensor is integrated in the rear interior light.
> E91 with Panorama glass sunroof
The ultrasonic interior motion sensor is installed at the FZD control unit.
- Selector lever or shift lever in the centre console
If reverse gear is engaged, the electrochromic mirrors will not be dimmed.
- Power supply from the distributor in the junction box
The roof control panel draws its power supply from the distributor in the junction box.
> E81, E87, E90, E91 E92
3 positive cables connect the distributor in the junction box to the roof control panel:
- Terminal 15
- Terminal 30
- Terminal 30g, not E91 with option 402 "Panorama glass roof"

> E93
2 positive cables connect the distributor in the junction box to the roof control panel:
- Terminal 15
- Terminal 30
> E70
3 positive wires lead from the power distributor in the junction box and from the rear power distributor to the roof control panel:
- Terminal 15 from rear power distributor
- Terminal 30g
- with option 402 "Panorama glass roof" from rear power distributor,
- without option 402 "Panorama glass roof" from power distributor in the junction box,
- Terminal 30 from power distributor in the junction box

The junction box houses a distributor and a control unit. The control unit is called the junction box electronics.
The junction box electronics (JBE control unit) is the data interface for the following data buses:
- K-CAN (body CAN)
- PT-CAN (powertrain CAN)
- Diagnosis wire
The signals from the F-CAN (Chassis CAN) are simply looped through the junction box. This means that the signals from the F-CAN are not received and processed by the JBE control unit. The F-CAN cables are simply routed through the junction box housing.
[for further information, please refer to SI Technology (SBT) 61 05 04 095] Description and Operation
The following control units are associated with the FZD control unit (depending on the equipment):
- CAS: Car Access System
The CAS (Car Access System) control unit supplies the terminal status Terminal R ON.
The CAS control unit is connected to the FZD control unit via the K-CAN.
The CAS control unit supplies the "convenience closing" or "convenience opening" message for the sliding/tilting sunroof.
> E93
The CAS control unit is connected to the DWA control unit via the K-CAN (DWA control unit: siren with tilt alarm sensor and integrated DWA software)
[for further information, please refer to SI Technology (SBT) 61 03 03 019] Car Access System
- CA: Comfort Access
The CA (Comfort Access) control unit supplies the "convenience closing" or "convenience opening" message for the sliding/tilting sunroof. The request is sent when the outside door handle is pressed for longer than 2 seconds.
Comfort Access is connected to the FZD control unit via the K-CAN.
[for further information, please refer to SI Technology (SBT) 66 04 04 093] Comfort Access
- DWA: Anti-theft alarm system
For the DWA control unit, the FZD control unit is the interface to the K-CAN.
The DWA control unit receives messages about the doors and engine hood as well as the boot lid (e.g. closed, open) via the K-CAN.
The DWA control unit evaluates the signals from the ultrasonic interior motion sensor.
The messages from the DWA are looped through the roof control panel. This means that the cables for the anti-theft alarm system are routed through the roof control panel housing.
Messages from the DWA control unit are fed via a direct wire to the DWA LED. The DWA control unit is connected to the siren with tilt alarm sensor via the K-bus.
[for further information, please refer to SI Technology (SBT) 61 09 03 031]
> E93
DWA control unit: siren with tilt alarm sensor and integrated DWA software
The software for the DWA is integrated in the siren with tilt alarm sensor.
[for further information, please refer to SI Technology (SBT) 65 04 03 061]
> E70
DWA control unit: FZD control unit with integrated DWA software
The DWA LED is actuated directly by the FZD.
- EGS: Electronic transmission control
The EGS control unit supplies the "Reverse gear engaged" message for the electrochromic interior mirror (with automatic transmission).
Signal path: EGS (electronic transmission control) -> PT-CAN -> Junction box electronics (JBE) in junction box -> K-CAN -> FZD (roof control panel).
If reverse gear is engaged, the electrochromic mirrors will not be dimmed.
[for further information, please refer to SI Technology (SBT) 24 01 03 040]
- FRM: Footwell module
The footwell module (FRM) controls the interior and exterior lighting but not the reading light. The reading light is controlled by the roof control panel.
The FRM control unit is connected to the roof control panel via the K-CAN.
[for further information, please refer to SI Technology (SBT) 61 04 04 094] Description and Operation
- IHKA: Integrated automatic heating and air-conditioning system
The IHKA control unit receives the signals from the condensation sensor via the FZD control unit.
The IHKA control unit is connected to the FZD control unit via the K-CAN.
[for further information, please refer to SI Technology (SBT) 64 01 01 090] 64 01 04 (090) Integrated Heating Control and Air-Conditioning System
- KOMBI: Instrument cluster
The instrument cluster control unit in the instrument cluster sends messages to the FZD control unit, e.g. regarding the dimming of the instrument lighting. The FZD control unit dims e.g. the LED in the sliding/tilting sunroof switch.
The instrument cluster control unit also receives messages from the FZD control unit:e.g. the FZD control unit will send a message to the instrument cluster control unit when the anti-trap circuit on the sliding/tilting sunroof is triggered. The instrument cluster control unit then converts this message to a Check-Control message in the vehicle's system.
The instrument cluster control unit is connected to the FZD control unit via the K-CAN.
[for further information, please refer to SI Technology (SBT) 62 01 04 074] Description and Operation
- RLS / RLSS: rain-light sensor / rain-light solar sensor
The rain-light sensor or rain-light solar sensor is like the condensation sensor in the base of the electrochromic interior mirror.
The RLS or RLSS detects water on the windscreen and the ambient brightness. The solar sensor in the RLSS also records the presence of light or heat sources (e.g. direct sunlight), which could affect the climate in the vehicle interior.
The signals from the RLS or RLSS are used to control the wiper function and for automatic driving lights control. With the RLSS, the signals from the solar sensor are also used to control the functions of the air conditioning.
The RLS or RLSS is a self-diagnosing control unit.
The RLS or RLSS is connected by a LIN bus to the roof control panel (LIN: Local Interconnect Network, i.e. local data bus).
[for further information, please refer to SI Technology (SBT) 63 03 02 007] 63 02 03 007 Adaptive Headlight
- SZL: Steering Column Switch
The SZL control unit sends signals to the FZD control unit, e.g. from the wiper switch.
The SZL control unit is on the F-CAN (Chassis CAN).
Data is transmitted to the K-CAN via a number of data buses and control units.
Signal path: SZL -> F-CAN -> Junction box (merely looped through) -> F-CAN -> DSC (Dynamic Stability Control) -> PT-CAN -> JBE control unit in junction box -> K-CAN -> FZD -> Rain-light sensor or rain-light solar sensor.
In the High variant of the roof control panel, the following components are controlled by the FZD control unit:
- Interior lighting, front
The interior lighting includes the interior lights and the reading lights, left and right.
- Front interior light
The light source for the front interior light is a 6 W xenon lamp.
- Reading light for driver's side and passenger side
There is one reading lamp each on the right and on the left. The light source for the reading lamp is a 6 W xenon lamp.
- LEDs for top-light
The top-light comprises 2 orange LEDs.
- Lighting for the make-up mirrors
The lighting for the make-up mirror comes on automatically whenever the sliding visor for the make-up mirror is opened (regardless of whether or not the interior lighting is switched on).
There is a make-up mirror on the driver's side and on the passenger side.
- Rear interior light
The rear interior light is activated by the FZD control unit as follows:
- On the basic variant of the rear interior light, the rear interior lighting is switched on together with the lighting in the front of the vehicle. The rear interior light in the basic variant does not have its own switch. The rear interior light is switched on by the FZD control unit.
- On the High variant, the signals from the rear interior lighting buttons are sent to the FZD control unit.
The FZD control unit activates the required lights.
The top-light is activated by the FZD control unit whenever the exterior lights are switched on.
> E81, E87, E90, E91, E92
The following variant-specific versions of the rear-compartment interior light are available:
- Basic variant rear interior light
The basic variant, the rear interior light simply provides interior light.
- Rear interior light on the basic variant with cover for the ultrasonic interior motion sensor
On the basic variant with ultrasonic interior motion sensor, the ultrasonic interior motion sensor is fitted in the rear interior light.
- High variant rear interior light
On the High variant, the rear interior light provides both interior lighting and reading lights on the left and right.
- High variant rear interior light with cover for ultrasonic interior motion sensor
On the High variant with ultrasonic interior motion sensor, the rear-compartment interior light features the ultrasonic interior motion sensor in addition to the interior lighting and reading lights.
> E70 and E91 with Panorama glass roof
The ultrasonic interior motion sensor is located in the FZD (E70) or on the FZD (E91 with Panorama glass roof).

> E70 and E91 with Panorama glass roof
The E70, E91 has 2 rear interior lights: on the C-pillar left and right.
- Sliding/tilting sunroof drive
> E87, E90, E92
The FZD control unit actuates the sliding/tilting sunroof drive (dependent on the sliding/tilting sunroof switch or central locking system).
> E70
The FZD control unit controls 2 drives. One drive operates the two glass roofs (Panorama glass roof), the other the sliding visor and the wind deflector.
> E91
On the E91 with Panorama glass roof there is a separate SHD control unit for the 2 drives.
[For further information, please refer to SI Technology (SBT) 61 12 03 055]
- Rain-light sensor / rain-light solar sensor
The FZD control unit sends important messages for the operation of the wipers to the rain-light sensor or rain-light solar sensor (via the LIN bus, see below in the "System functions" section)
- Condensation sensor
The condensation sensor draws its power supply from the roof control panel.
- Electrochromic interior mirror and electrochromic exterior mirrors
The roof control panel controls the dimming of the electrochromic mirrors as follows:
the roof function centre control unit converts the analogue signal from the electrochromic interior rear-view mirror into a CAN message for the electrochromic door mirrors.
- Ultrasonic interior motion sensor
> E70, E81, E87, E90, E91, E92
The ultrasonic interior motion sensor draws its power supply from the roof control panel. The ultrasonic interior motion sensor is in the DWA control unit.
> E70
The DWA control unit and ultrasonic interior motion sensor are integrated in the roof control panel.
- 4 microwave sensors
> E93
The 4 microwave sensors use microwaves to record movement inside the vehicle interior. A movement is detected if the reflection (echo) of the microwaves changes.
The range or sensitivity of the microwave sensors is preset (depending on the vehicle model and the equipment fitted).
The microwave sensors are connected to the alarm system control unit by a single-wire bus (K-bus). The DWA control unit is connected to the K-CAN.
- FBD receiver: Remote control receiver
> E81, E87, E93
The FBD receiver for the central locking system is installed in the interior mirror (FBD receiver is the receiver for remote control).
In the standard equipment version, the FBD receiver draws its power supply from the power distributor in the junction box.
If an FZD control unit is fitted (depending on the equipment variant), power is supplied from the power distributor in the junction box to the FBD receiver by the FZD control unit (wire is merely looped through).
> E90, E91, E92
The FBD receiver is located in the aerial amplifier in the headlining above the rear window. Power is supplied from the power distributor in the junction box.
> E70
The FBD receiver is installed in the aerial amplifier with aerial diversity in the tailgate. Power is supplied from the rear power distributor.
- DWA LED
The DWA LED is located on the underside of the interior mirror. The DWA LED flashes when the anti-theft alarm system is activated. When an alarm is triggered, the DWA LED lights up.
The DWA LED draws its power supply from the roof control panel. The signal from the ultrasonic interior motion sensor for the DWA LED is simply looped through the roof control panel (i.e. the cable for the sensor is routed through the roof control panel).
> E70
The FZD directly actuates the DWA LED.
> E93
The DWA LED draws its power from power distributor in the junction box. The DWA LED is actuated by the DWA control unit (DWA control unit: siren with tilt alarm sensor and integrated DWA software).
[for further information, please refer to SI Technology (SBT) 61 09 03 031]
- Garage-door remote controls
The 3 buttons for the garage door opener (also known as "integrated universal remote control") are in the interior mirror.
The garage door opener draws its power supply from the roof control panel.