Headlamp control, function - GF82.10-P-2009GMB
MODEL 164.1 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination as of model year 2009/YoM 08 model refinement package
MODEL 164.8 up to 30.6.09 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination as of model year 2009/YoM 08
MODEL 164.8 with CODE (615) Bi-xenon headlamp unit with integrated curve illumination with CODE (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination with CODE (621) Intelligent Light System (left-hand traffic) with CODE (622) Intelligent Light System (right-hand traffic) as of model year 2010/YoM 09 model refinement package
Function requirements for driving lights actuation, general
- No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)
Driving lights actuation, general
Driving lights actuation includes all functions which serve the optimum illumination of the road while driving.
During driving lights actuation, the standing lights actuation is active; this is described in the separate "Standing/parking lights actuation, function" Service Information.
The driving lights actuation function is comprised of the following subfunctions:
- Function sequence for low beam actuation
- Function sequence for high beam actuation
- Function sequence for daytime running lights actuation
- Function sequence for auto on/off headlamps
- Function sequence for headlamp range adjustment (HRA [LWR])
The driving lights are actuated corresponding to the position of the rotary light switch (S1).
The upper control panel control unit (N72/1) reads in the rotary light switch status over the instrument panel LIN (LIN 1) and sends it over the interior CAN (CAN B) to the front SAM control unit (N10).
Additional low beams actuation function requirements
- Circuit 15 ON
Function sequence for low beam actuation
Turning the rotary light switch to the "manual driving lights" position requests actuation of the low beams.
The EZS control unit (N73) transmits the status of circuit 15 via the interior CAN.
The upper control panel control unit reads in the status of the rotary light switch over the instrument panel LIN and sends it over the interior CAN to the front SAM control unit. The front SAM control unit sends the "Switch low beams on" request by transmitting a voltage signal directly to the xenon headlamp control unit (E1n1) at the left front lamp unit (E1) and the xenon headlamp control unit (E2n1) at the right front lamp unit (E2). The xenon headlamp control unit at the left front lamp unit then actuates the left bi-xenon light with integrated ignition module (E1e10).
The xenon headlamp control unit at the right front lamp unit then actuates the right bi-xenon light with integrated ignition module (E2e10). In vehicles as of 1.7.09, the front SAM control unit also transmits the request "Low beam indicator lamp ON" via interior CAN to the instrument cluster (A1), which then actuates the low beam indicator lamp (A1e67).
Additional function requirements, high beam actuation
- For high beams function: Circuit 15 and low beams On
- For headlamp flasher function: Circuit 15R On
High beam actuation function sequence
The high beams actuation is comprised of the following subfunctions:
D Function sequence for high beams
D Function sequence for headlamp flasher
Function sequence for high beams
The high beams actuation is requested by pressing the combination switch (S4) forward.
The steering column tube module (N80) directly reads in the switch position of the combination switch and transmits this via engine compartment CAN (CAN C), central gateway control unit (N93) and interior CAN to the front SAM control unit.
The front SAM control unit then actuates the left high beam (E1e1) and the right high beam (E2e1), and in vehicles with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination, the left high beam solenoid (E1l1) and the right high beam solenoid (E2l1).
In model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) the xenon headlamp control units read in all of the relevant information via engine compartment CAN.
The xenon headlamp control unit at the left front lamp unit actuates the left light distribution cylinder motor (E1m3) and the xenon headlamp control unit at the right front lamp unit actuates the right light distribution cylinder motor (E2m3) via the relevant headlamp-internal local interconnect network (LIN).
The panels that partially cover up the bi-xenon light cone are turned away, thereby releasing the entire light beam to illuminate the traffic lane.
The front SAM control unit then transmits the "High beam actuation active" status via the interior CAN to the instrument cluster. This then actuates the high beam indicator lamp (A1e3).
Function sequence for headlamp flasher
The function sequence and signal path for the headlamp flasher function correspond to that of the high beam function.
However, to request the headlamp flasher, the combination switch must be pulled backward.
The high beams actuation remains active for as long as the combination switch is held in this position. In vehicles with code (615) Bi-xenon headlamp unit with integral curve illumination or code (616) Bi-xenon headlamp unit with integral asymmetrical curve illumination, if low beam actuation is not active only the high beams are actuated, since it would take too long to ignite the bi-xenon lights and ramp up to full brightness.
For vehicles with code (460) Canada version or code (494) USA version, the high beams must not be actuated at the same time as the left front fog lamp (E5/1) and right front fog lamp (E5/2) (for model 164.1 up to 31.7.10, model 164.8 up to 30.6.09). The last incoming request has priority.
Additional function requirements for daytime running lights actuation
- Engine running (circuit 61 On) n > 300 rpm or vehicle speed v > 3 km/h
- Function activated via the instrument cluster (only countries without legal daytime running lights specification)
- Rotary light switch in position:
- Exterior lights OFF "0"
- Auto on/off headlamps "AUTO"
- "Left parking light" or "Right parking light" (can be coded)
Function sequence for daytime running lights actuation
The request for the daytime running lights function is output depending on the country coding or activated manually by the instrument cluster via the interior CAN.
The circuit 61 status and the engine rpm are sent by the CDI control unit (N3/9) (for diesel engine) or the ME-SFI [ME] control unit (N3/10) (for gasoline engine) over the engine compartment CAN, central gateway control unit and interior CAN to the front SAM control unit. The instrument cluster transmits the vehicle speed via interior CAN.
Model 164.1 up to 31.7.10, model 164.8 up to 30.6.09:
The front SAM control unit reads in all of the relevant information, evaluates it and outputs the request "Switch on low beams" via a voltage signal directly to the xenon headlamp control units. The xenon headlamp control units then actuate the bi-xenon lamps.
In vehicles with code (460) Canada version or code (494) USA version, low beam actuation is activated in accordance with the ambient brightness. This is detected by the rain/light sensor (B38/2). The information from the rain/light sensor is read in by the overhead control panel control unit (N70) and transmitted via the interior CAN to the front SAM control unit. If it is dark, the front SAM control unit activates both low beam actuation and standing lights actuation. Only low beam actuation takes place during daylight.
Model 164.8 as of 1.7.09, model 164.1 as of 1.8.10:
The front SAM control unit reads in all of the relevant information and actuates the left daytime running lights headlamp (E1/3) or the right daytime running lights headlamp (E2/3).
When it is dark and the rotary light switch is in the "AUTO" position, the front SAM control unit actuates the daytime running lights headlamps at reduced power and also switches on the low beam actuation.
For vehicles with code (460) Canada version or code (494) USA version, the daytime running lights headlamps are switched on in darkness while undimmed.
For vehicles with code (498) Japan version, the daytime running lights headlamps are used as position lamps. They are not actuated as for the daytime running lights. The daytime running lights headlamps are only switched on when dimmed in the dark in addition to the low beam actuation.
For vehicles with code (460) Canada version or code (494) USA version, daytime running lights actuation is switched off when the vehicle is stationary after t = 3 min. When the vehicle then starts to move again, the front SAM control unit automatically activates daytime running lights actuation.
Daytime running lights actuation is deactivated as soon as the rotary light switch is moved to the "Standing lights" position or the "Manual driving lights" position.
The daytime running lights have a higher priority than the auto on/off headlamps.
In countries with legal daytime running light requirements, only the headlamp flasher is permissible but not the high beams.
The high beams are only permissible if the driving lights have been switched on manually via the rotary light switch (without code (460) Canada version or without code (494) USA version).
Additional function requirements for auto on/off headlamps
- Engine running (n > 300 rpm) or circuit 61 On or vehicle speed v > 3 km/h
- Rotary light switch in position "AUTO" or "0" (can be coded)
- Rain/light sensor signals "Darkness detected"
Function sequence for auto on/off headlamps
The auto on/off headlamps function is no more than a convenience system and does not exempt the driver from following the rules of the road traffic regulations.
For auto on/off headlamps, the low beams are switched on or off depending on the ambient brightness or the wiper system activities. Ambient brightness is assessed by the rain/light sensor. The front SAM control unit actuates the wiper system.
Start of trip:
- Transmitter key (A8/1) removed Standing lights/low beams OFF
- Circuit 15C ON Standing lights/low beams OFF
- Circuit 15R ON Standing lights ON
- Circuit 15 ON Standing lights ON
- Engine is running or Circuit 61 On or v > 3 km/h standing lights/low beams ON (high beams permissible)
End of trip:
- Engine is running or Circuit 61 On or v > 3 km/h standing lights/low beams ON (high beams permissible)
- Circuit 15R ON Standing lights ON
- Circuit 15C ON Standing lights ON
- Transmitter key removed Standing lights/low beams OFF
The standing lights are switched off as soon as the driver door is opened with the transmitter key (circuit 15C) inserted.
The circuit 61 status and the engine rpm are sent by the CDI control unit or the ME-SFI [ME] control unit over the engine compartment CAN, central gateway control unit and interior CAN to the front SAM control unit.
The instrument cluster transmits the vehicle speed via interior CAN. The overhead control panel control unit reads in the rain/light sensor data and forwards this via interior CAN to the front SAM control unit. If darkness is recognized, the front SAM control unit forwards the "Switch on low beams" request by means of a voltage signal straight to the xenon headlamp control units, which then actuate the bi-xenon lights.
If the windshield wiper system is activated for t = ≥ 20 s with a wipe cycle time of t < 6 s, the front SAM control unit activates low beam actuation. If there are no wipe cycles for t ≥ 20 s, low beam actuation is deactivated.
Auto on/off headlamps switch-off conditions:
In the event of rain/light sensor failure, the auto on/off headlamps are not deactivated until the engine is switched off.
When the vehicle is being driven through a tunnel and if the wiper start suppression function is active, the auto on/off headlamps function remains active. If the wiper start suppression function is canceled, the auto on/off headlamps function remains active for an additional t = 20 s.
Additional function requirements, automatic HRA [LWR]
- Engine is running (n > 300 rpm) or circuit 61 On
- Driving lights On (low beam/high beam)
Function sequence for automatic HRA [LWR]
The automatic HRA [LWR] permits the correction of the headlamp range of the vehicle headlamps as a function of the load or the vehicle pitch motions induced by the vehicle dynamics.
The following information that describes the driving status is included into the computation of the correction values:
- Body pitch angle from the axis positions
- Vehicle speed in order to calculate the operating mode
In vehicles without code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS), the xenon headlamp control unit at the left front lamp unit reads in the signals of the right front level sensor (B22/9) and the right rear level sensor (B22/10) and uses them to calculate the vehicle level.
The xenon headlamp control unit at the left front lamp unit transmits corresponding correction values via the engine compartment CAN to the xenon headlamp control unit at the right front lamp unit.
In vehicles with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS), the AIRMATIC control unit (N51) transmits the information about the vehicle level via engine compartment CAN.
The circuit 61 status is sent by the CDI control unit or the ME-SFI [ME] control unit over the engine compartment CAN to the instrument cluster. The instrument cluster sends the "circuit 61 decoupled" signal to the xenon headlamp control unit on the left front lamp unit.
Information on wheel speeds and wheel rotation directions, as an indicator of vehicle speed, is sent by the ESP control unit (N47-5) (except model 164.195) or the recuperative braking system control unit (N30/6) (model 164.195) over the engine compartment CAN.
This information is required to regulate the adjustment rate of the automatic headlamp range adjustment.
If the vehicle is moving at a constant speed, the automatic headlamp range adjustment system operates in "static mode" at a slow adjustment rate.
In the event of acceleration, the "dynamic mode" is activated with a high adjustment rate.
The xenon headlamp control unit at the left front lamp unit reads in all of the relevant information via engine compartment CAN, evaluates it, and as master synchronizes the xenon headlamp control unit at the right front lamp unit.
The xenon headlamp control unit on the left front lamp unit correspondingly actuates the left headlamp range adjustment motor (E1m1), and the xenon headlamp control unit on the right front lamp unit actuates the right headlamp range adjustment motor (E2m1).
With model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) the headlamp range adjustment motors are actuated via the respective headlamp-internal local interconnect network (LIN).
| Electrical function schematic for driving lights actuation | With code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination | PE82.10-P-2059-97MAB | |
| Model 164.8. as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) | PE82.10-P-2059-97MAC | ||
| Instrument cluster, component description | A1 Model 164 (except 164.195) |
GF54.30-P-6000GM | |
| On model 164.195 * for USA only |
GF54.30-P-6000GQH | ||
| Component description for Xenon headlamp control unit | E1n1, E2n1 | GF82.10-P-2114GM | |
| CDI control unit, component description | N3/9 With engine 629.9 |
GF07.16-P-6000OAG | |
| With engine 642.8 | GF07.16-P-6000OGU | ||
| With engine 642.9 | GF07.16-P-6000OHG | ||
| ME-SFI [ME] control unit, component description | N3/10 With engine 156 |
GF07.61-P-6000MAG | |
| With engine 272.967 | GF07.61-P-6000MIG | ||
| With engine 272.973 * for USA only |
GF07.61-P-6000MQH | ||
| With engine 273.9 | GF07.61-P-6000MLG | ||
| Component description for front SAM control unit | N10 | GF54.21-P-7010GM | |
| Component description for regenerative braking system control unit | N30/6 On model 164.195 * for USA only |
GF42.22-P-1100GQH | |
| Component description for ESP control unit | N47-5 Model 164 (except 164.195) |
GF42.45-P-5118GM | |
| AIRmatic with ADS control unit, component description | N51 Model 164.1 with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system ADS), with model 164.8 |
GF32.22-P-5108GM | |
| Overhead control panel control unit, component description | N70 | GF82.20-P-5216GM | |
| Upper control panel control unit, component description | N72/1 | GF54.21-P-6040GM | |
| Component description for EZS control unit | N73 Model 164 (except 164.195) |
GF80.57-P-6003GM | |
| Model 164.195 * for USA only |
GF80.57-P-6003GQH | ||
| Steering column tube module control unit, component description | N80 | GF54.21-P-6051GM | |
| Component description for central gateway control unit | N93 | GF54.21-P-4170GM |