LED headlight
The footwell module (FRM) or the Body Domain Controller (BDC) is the master control unit for the exterior lights. That means: All lighting functions are controlled by the footwell module (FRM) or the Body Domain Controller (BDC).
Depending on the selected lighting function, the corresponding components are either activated directly by the control unit (FRM or BDC) or at the request of the corresponding control unit (FRM or BDC) via the headlight driver module and the LED main light module.
Depending on the light function, multiple LEDs are usually bundled and switched together in so-called LED modules.
Both reflectors in the LED headlight can be pivoted horizontally. Only the outer reflector is vertically pivotable as well.
The following graphic shows the right LED headlight using the example of F10 (US version).
| Item | Explanation |
|---|---|
| A | LED headlight, right - General view from front |
| B | LED headlight, right - General view from rear |
| 1 | Side-marker light |
| 2 | External reflector for the low-beam headlight |
| 3 | Positioning light and turn indicator |
| 4 | Internal reflector for the low-beam headlight |
| 5 | Cornering light |
| 6 | Internal reflector for the high-beam headlight (for broad range illumination) |
| 7 | Lighting ring for parking lights, side lights and daytime driving lights |
| 8 | Exterior reflector for the high-beam headlight (partial high-beam headlight, vertical light/dark boundary) |
| 9 | LED module for turn indicator and positioning light |
| 10 | Outer fan cover |
| 11 | Right headlight driver module (STMR) |
| 12 | Inner fan cover |
| 13 | LED main headlight module on the right (LHMR) |
| 14 | 12-pin plug connection |
| 15 | Cornering light with heat sink |
The following graphic shows the left LED headlight using the example of F15 (European version).
| Item | Explanation |
|---|---|
| A | LED headlight, left - General view from the front |
| B | Left headlight left - view from rear |
| 1 | Cornering light |
| 2 | Internal reflector for the low-beam headlight |
| 3 | Positioning light and turn indicator |
| 4 | Lighting ring for parking lights, side lights and daytime driving lights |
| 5 | External reflector for the low-beam headlight |
| 6 | Exterior reflector for the high-beam headlight (partial high-beam headlight, vertical light/dark boundary) |
| 7 | Internal reflector for the high-beam headlight (for broad range illumination) |
| 8 | Cornering light with heat sink |
| 9 | Left LED main light module (LHML) |
| 10 | 12-pin plug connection Outer fan cover |
| 11 | Left headlight driver module (STML) |
| 12 | LED module for turn indicator and positioning light |
A headlight consists of 4 reflectors, two upper for the low-beam headlights and two lower for the high-beam headlights. Two reflectors on top of each other (one reflector each for the low-beam headlight and for the high-beam headlight) constitute one unit each. The interior and exterior units have different light distributions.
The external unit is swivelled in and out with the adaptive headlight stepper motor around the vertical axis. Both units are fitted in one frame (also known as: Swivel module), which is swivelled up and down by the stepper motor for the headlight beam throw adjustment.
The LED is activated by the interconnected modules, which assume the necessary constant voltage control for the LEDs. One main LED light module (LHM) and one headlight driver module are used. The headlight driver module also activates the stepper motors. The footwell module (FRM) or the Body Domain Controller (BDC) issues the request on the LIN bus.