BMW 7 Series: More Functions

Bi-xenon Headlights

Bi-xenon headlights are installed as standard equipment and are located in the outer chamber of the headlights.

In connection with the bi-xenon headlights, the shutter for the low beam light is activated by the "high beam ON" signal thus enabling the high beam light. High beam is also used for the headlight flasher function

Fig. 55: Identifying Bi-Xenon Headlights Components

COMPONENTS DESCRIPTION CHART

1. Turning lights
2. Bi-xenon low beam/high beam
3. Position light/daytime driving lights/design light
4. Side marker light (US only)
5. Direction indicator lights
6. Side lights/daytime driving lights corona ring
7. Side lights/daytime driving lights corona ring

Fig. 56: Identifying Bi-Xenon Headlights F01/F02 (Rear View)

COMPONENTS DESCRIPTION CHART

1. Direction indicator lights heat sink
2. Headlight driver module
3. Cover for bi-xenon lamp
4. Cover for lamp, side lights/daytime driving lights corona ring
5. Headlight connection
6. Voltage supply for bi-xenon lamp
7. Cover for lamp, turning lights

Daytime driving lights

A 35 W bulb for the daytime driving light is in the headlight inner chamber. The daytime driving light with respect to the side lights is produced by the inner and outer corona rings. The corona rings are fiber optics conductors.

The inner corona ring is illuminated from behind. The reflector is designed to ensure that the light mainly illuminates the corona ring. Light from the same headlight chamber is coupled in two fiber optics cables and fed to the outer corona ring.

The footwell module decreases the daytime driving lights as soon as the side lights or low beam lights are switched on. Consequently, both corona rings of the daytime driving light are now used for the side lights.

The light switch must be in position "0" in order to activate the daytime driving lights.

The daytime driving lights are also switched on at low beam OFF with automatic driving lights control. The light switch must be set to position "A".

The daytime driving lights function is country-specific and is activated as from "Terminal 15 ON". The daytime driving lights can be deactivated/activated via the personal profile.

The daytime driving lights are switched off after "Terminal 15 OFF".

NOTE: The daytime driving lights cannot be deactivated in the personal profile in the US version. The daytime driving lights can also be activated in light switch position 1 side lights.

Welcome Light

The welcome light can not be activated when the light switch is in position "0" or "1". Furthermore, the side lights are also not to be activated.

The welcome light is switched on as soon as the vehicle is unlocked. For this purpose, the Car Access System makes available the status of the central locking system via the K-CAN2.

The footwell module receives the "Unlock vehicle" status and switches on the exterior lighting for approximately 20 seconds.

While switched on, the welcome light can be deactivated with the "Terminal 15 ON" status.

The following light units are activated:

• Tail lights
• Corona rings
• Side marker light
• Interior lighting
• Courtesy lighting
• Indicator light in the instrument cluster.

Delayed Switch-off Home Lights

The delayed switch-off home lights are standard equipment. The lights can be switched on via the steering column switch for high beam as from lights OFF, at Terminal 30.

The switch-on time is set at the factory to 40 seconds and can be set between 0 and 240 seconds in the "Personal Profile".

The low beam, side lights and tail lights are switched on when the home lights function is active.

Beam Throw Adjustment System The F01/F02 has a dynamic beam throw adjustment system in the standard equipment. The dynamic beam throw adjustment system is a legal requirement for bi-xenon light. The dynamic beam throw adjustment ensures that oncoming traffic is not dazzled.

One ride-height sensor is installed at the front and one at the rear for the beam throw adjustment system.

Front and rear ride-height sensors

One ride-height sensor is mounted on the front axle and the other ride-height sensor on the rear axle of the vehicle. The signals from the ride-height sensors are used for the beam throw adjustment LWR.

The ride-height sensors are evaluated directly by the integrated chassis management. The footwell module receives the signals from the integrated chassis management via the KCAN2. In the central gateway module the signal must be transferred from the FlexRay to the K-CAN.

Lamp Monitoring

The footwell monitors all lamps of the exterior lighting system both when switched on and when switched off.

The monitoring function starts as from "Terminal 15 ON".

Cold monitoring with "Lights OFF"

Cold monitoring is based on measuring the current of the individual lamp outputs. The current pulse used for measurement purposes is so short that the lamps are not illuminated. The footwell module evaluates the individual lamp outputs to establish whether there is a line break or a lamp bulb is defective.

The number of current pulses is increased significantly during the first 4 seconds after "Terminal 15 ON". To check whether the lamps are in working order before setting off. This function is referred to as the pre-drive check.

The number of pulses is then reduced after the pre-drive check. Power is then applied to the lamps every 1.5 minutes.

The lights fitted with LEDs are not included in the cold monitoring system. The LEDs react too fast to the current pulse and would consequently light up.

The bi-xenon headlight is also not included in the cold monitoring.

Hot monitoring with "Lights ON"

Hot monitoring is based on measuring the current of the individual lamp outputs. The lamp current is used to detect an overcurrent or interruption (break). The front and rear direction indicator lights are also included in the lamp monitoring system.

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