GF82.10-P-1002TY Dynamic Cornering Lamp, Function

GF82.10-P-1002TY Dynamic Cornering Lamp, Function
- with CODE (615) Bi-xenon headlamp unit with integrated cornering lamps

Function requirements
^ Circuit 61 ON
^ Exterior lamp switch (S1) in "low beam" position or
^ Exterior lamp switch in "Auto" position and the rain/light sensor (B38/2) signals "darkness"
^ Vehicle in forward movement

When the vehicle is at a standstill, the cornering lamp reaches its "zero position" again.

Function
The dynamic cornering lamp ensures optimum corner illumination. A conventional bi-xenon headlamp serves as the basis which as previously makes available high beam and low beam.
The entire headlamp unit is mounted in a mounting frame so that it pivots horizontally. When steering into a curve, this also pivots inward up to max. 15°.
The system functions both for low beam and for high beam.

Dynamic cornering lamp actuation depends on the following set variables:
^ Steering angle
^ Incline angle
^ The vehicle speed

The direct input parameter is the steering angle, for it describes the driver's direction requirement.
The vehicle speed influences the control response of the swivel angle relative to the steering angle.
At a low vehicle speed a smaller ratio is needed so that, e.g., in city traffic the light pattern does not give the impression of being too jumpy.
At moderate speeds direct reactions follow relatively small steering wheel angle changes.
At higher speed the system responses have a larger ratio.

The damping and amplification is continuous and not threshold- specific so that a faster swiveling back in the curve exit is ensured.

In order to compensate for the vehicle's natural pendulum motion when driving straight ahead, a zone with lower sensitivity an greater dampening is provided (approx. ±6° steering angle).

Actuation
The headlamp range adjustment control unit (N71) actuates the left dynamic cornering lamp motor (E1m2) via the HRA power module (E1n3) and the right dynamic cornering lamp motor (E2m2) via the HRA power module (E2n3).
Faults that occur such as short circuits or discontinuities are sent back as feedback to the headlamp range adjustment control unit.

Adjustment values
Effective dynamic swivel angle:
^ 12° to 15° to vehicle outside
^ 6° to 8° to vehicle inside

Swivel speed
The swivel speed is at least 15 °/s.

Backup function in the event of failure of the dynamic cornering lamp
In the event of a failure, a corresponding signal is sent from the headlamp range adjustment control unit via Controller Area Network bus class C (engine compartment) (CAN-C) to the central gateway control unit (N93) for the backup function. From the central gateway control unit, the signal is forwarded via Controller Area Network bus class B (interior) (CAN-B) to the driver-side SAM control unit with fuse and relay module (N10/1) and the passenger-side SAM control unit (N10/11). The signals for the backup function are transmitted depending on vehicle speed. A distinction is made between a right hand steering vehicle and left hand steering vehicle.
In general, in the event of a failure of the cornering lamp control, the affected left low beam (E1e2) or the right low beam (E2e2) is switched off and the left front fog lamp (E5/1) and the right front fog lamp (E5/2) are switched on to prevent oncoming traffic from being dazzled.
If the front fog lamp is also defective, the particular defective low beam is still switched off.

In the event of a defect at the dynamic cornering lamp, an error message is displayed in the multifunction display (A1p13) of the instrument cluster (A1). The meaning of the various error messages are listed in the owner's manual.

Diagnosis
Diagnosis of the cornering lamp power module is possible in connection with the headlamp range adjustment control unit.