GF82.10-P-3004QB High Beam Control, Function

GF82.10-P-3004QB High Beam Control, Function
- with CODE (614) Bi-xenon headlamp unit
- with CODE (615) Bi-xenon headlamp unit with integrated curve illumination

Component Identification:

Function requirements:
^ The transmitter key (A8/1) is located in the EIS control unit (N73) in position 2 "Circuit 15 ON".
^ The rotary light switch (S1s1) in the light switch module (S1) is in the driving lamps "ON" position
^ The rotary light switch (S1s1) in the light switch module (S1) is in the "AUTO" position and the rain/light sensor (B38/2) has detected "Night"
^ In the instrument cluster (A1) the daytime running lamps function is active

High beam function
The steering column module (N80) records the position of the combination switch (S4) and transmits the message "High beam ON" via the Controller Area Network bus class B (interior) (CAN) to the front SAM control unit with fuse and relay module (N10/1) and the instrument cluster (A1).

The front SAM control unit with fuse and relay module (N10/1) passes the request "High beam ON" via a discrete line to the left front lamp unit (E1) and the right front lamp unit (E2). The xenon headlamp control unit (E1n1) reads in the request and actuates the left high beam solenoid (E1l1). The xenon headlamp control unit (E2n1) also reads in the request and actuates the right high beam solenoid (E2l1). Due to the actuation of the left high beam solenoid (E1l1) and right high beam solenoid (E2l1) the covers, which mask off the lower part of the light beam with low beam, are moved away downwards. This in turn means that the full beam has recourse to the entire light beam. The instrument cluster (A1) actuates the blue high beam indicator lamp (A1e3) as a visual feedback signal.

Function requirements:
^ The transmitter key (A8/1) is located in the EIS control unit (N73) in position 2 "Circuit 15 ON".
^ The combination switch (S4) is in the headlamp flasher (LH) applied position

Headlamp flasher function
The steering column module (N80) records the position of the combination switch (S4) and transmits the message "High beam ON" via the Controller Area Network bus class B (interior) (CAN) to the front SAM control unit with fuse and relay module (N10/1) and the instrument cluster (A1). The front SAM control unit with fuse and relay module (N10/1) passes the request "High beam ON" via a discrete line to the left front lamp unit (E1) and the right front lamp unit (E2). The xenon headlamp control unit (E1n1) and the xenon headlamp control unit (E2n1) read in the request for the headlamp flasher.

If the bi-xenon headlamps are switched on, the left high beam solenoid (E1l1) and the right high beam solenoid (E2l1) are actuated for the duration of the actuation of the combination switch (S4). Due to the actuation of the left high beam solenoid (E1l1) and right high beam solenoid (E2l1) the covers, which mask off the lower part of the light beam with low beam, are moved away downwards. This in turn means that the full beam has recourse to the entire light beam. If the bi-xenon headlamps are not switched on, the request for the headlamp flasher is implemented with the left high beam (E1e1) and the right high beam (E2e1), which are also installed, because the xenon lamp has a longer start-up time than the halogen lamps. The headlamp flasher function remains actuated for the duration of the actuation of the combination switch (S4). In both cases, the blue high beam indicator lamp (A1e3) is actuated in the instrument cluster (A1) as a visual feedback signal.

Headlamp range adjustment function
The headlamp range adjustment is only active when the driving lamps are switched on, i.e. for headlamp flasher without driving lamps, the range is not adapted. The headlamp range adjustment control unit (N71) receives the level data from the headlamp range adjustment rear axle sensor (A51) and from the headlamp range adjustment front axle sensor (A52) via a discrete line. The headlamp range adjustment is necessary to compensate for the vehicle's pitch motion caused by accelerating or braking. Other data are received via the Controller Area Network bus class C (engine compartment) (CAN-C). After evaluating all the data, the headlamp range adjustment control unit (N71) transmits the adjustment request to the xenon headlamp control unit (E1n1) and to the xenon headlamp control unit (E2n1). The adjustment request contains the adjustment direction and the amount of adjustment.

The xenon headlamp control unit (E1n1), upon receiving the adjustment request, actuates the left headlamp range adjustment motor (E1m1) for the corresponding amount of adjustment and adjustment direction. The xenon headlamp control unit (E2n1), upon receiving the adjustment request, actuates the right headlamp range adjustment motor (E2m1) for the corresponding amount of adjustment and adjustment direction.

At a constant vehicle speed the electric headlamp range adjustment operates in "static mode" with a low motor adjustment rate. If, however, positive or negative vehicle acceleration is occurring, the change is performed in "dynamic mode" at a high rate of adjustment.