LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2021 >> S560 Base >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System - Body - 217 Chassis (1 Of 7) >> Basic Knowledge >> Turn Signal Indicator Actuation, Function - GF82.10-P-3008LF

Turn Signal Indicator Actuation, Function - GF82.10-P-3008LF

Model 217, 222 

Function requirements, general 

Turn signal light actuation, general 

The turn signal light actuation consists of all functions for output of the turn signal, various warnings and feedback.

The master control unit for all flashing functions is the front SAM control unit (N10/6). The front SAM control unit prioritizes all flashing requests and transmits a flasher frequency with a time period of the bright phase of the turn signal lamps over the interior CAN (CAN B) to the corresponding control units.

IMPORTANT The currently active function is visually displayed to the driver by the left turn signal light control message or the right turn signal light control message. For acoustic feedback, the instrument cluster (A1) actuates the instrument cluster speaker (H4/61). In order to do this, the instrument cluster receives the flasher frequency sent by the front SAM control unit over the interior CAN, the electronic ignition lock control unit (N73) and the user interface CAN (CAN HMI). If a turn signal light or a turn signal lamp fails, the frequencies with which the turn signal light control message and the instrument cluster speaker are actuated double. The flashing frequency of the turn signal lights and turn signal lights of f = 1, 5 Hz continues to remain.

IMPORTANT Model 217, 222 with code 460 (Canada version)

Model 217, 222 with code 494 (US version)

If turn signal light actuation has been activated, the daytime running lights of the relevant side are deactivated.

IMPORTANT Model 222 as of model year 2018

If in Economic Commission for Europe (ECE) vehicles, the turn signal is activated while the daytime running lights are actuated, the daytime running lights are dimmed to position light level (approx. 10 %). The turn signal light and daytime running light are actuated in alternate fashion.

IMPORTANT Model 217, 222 with code 235 (Active Parking Assist with PARKTRONIC)

Model 217, 222 with code 503 (Pre-installation for Remote Parking Pilot)

The Parking Pilot and Remote Parking Pilot functions can request turn signaling or override manually set turn signals.

IMPORTANT Model 217, 222 with code 23P (Driving Assistance package)

The Steering Pilot can extend a driver-initiated turn signal or one-touch turn signaling. It can also re-request turn signaling if the driver previously signaled in the same direction within the last 10 s. The turn signal light actuation encompasses the following partial functions:

Additional function requirements for turn signaling 

IMPORTANT The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via the interior CAN.

Function sequence for turn indicators 

The turn signaling function encompasses the following subfunctions:

Function sequence, left turn signaling 

The left turn signal function is requested by pushing the combination switch (S4) downward.

The steering column tube module control unit (N80) directly reads in the switch position of the combination switch and sends it to the front SAM control unit via the chassis FlexRay (Flex E), electronic ignition lock control unit and interior CAN.

The front SAM control unit receives the switch position of the combination switch and sends the "Left turn signal" (flasher frequency) over the interior CAN to the following control units:

The left headlamp control unit receives the flasher frequency and actuates the left front turn signal light (E1e5) in the left front lamp unit (E1).

The left front door control unit receives the flasher frequency and actuates the left outside mirror turn signal lamp (E6/5).

The rear SAM control unit receives the flasher frequency and actuates the following component parts in the left rear lamp unit (E3) or in the inside left rear lamp unit (E3/1):

IMPORTANT Model 217 as of model year 2018 with code 460 (Canada version)

Model 217 as of model year 2018 with code 494 (US version)

The left tail light and inner left tail light do not completely illuminate during turn signaling, but do display an animation. This takes the form of a vertical stripe that moves from inside to outside. If the low beam is deactivated (during the day), only the moving stripe is illuminated. If the low beam is activated (at night), then the moving stripe surface is excluded from the entire lamp surface. If the fog light is activated, however, then the tail lights illuminate completely. There is no animation when the vehicle is at a standstill and circuit 15 is off, as well as when individual system components of the vehicle rear lamps have failed.

On vehicles with CODE 550 (Trailer hitch), the trailer recognition control unit receives the flasher frequency and actuates the left turn signal light on the trailer via the trailer socket (X58).

IMPORTANT The left turn signal can be overridden by the hazard warning flasher function, and vice versa.

Function sequence, right turn signaling 

The right turn signal function is requested by pushing the combination switch upward.

The steering column tube module control unit reads in the switch position of the combination switch directly and sends it via chassis FlexRay, the electronic ignition lock control unit and interior CAN to the front SAM control unit.

The front SAM control unit receives the switch position of the combination switch and sends the "Right turn signal" request (flasher frequency) over the interior CAN to the following control units:

The right headlamp control unit receives the flasher frequency and actuates the right front turn signal light (E2e5) in the right front lamp unit (E2).

The right front door control unit receives the flasher frequency and actuates the right outside mirror turn signal lamp (E6/6).

The rear SAM control unit receives the flasher frequency and actuates the following component parts in the right rear lamp unit (E4) or in the inside right rear lamp unit (E4/1):

IMPORTANT Model 217 as of model year 2018 with code 460 (Canada version)

Model 217 as of model year 2018 with code 494 (US version)

The right tail light and inner right tail light do not completely illuminate during turn signaling, but do display an animation. This takes the form of a vertical stripe that moves from inside to outside. If the low beam is deactivated (during the day), only the moving stripe is illuminated. If the low beam is activated (at night), then the moving stripe surface is excluded from the entire lamp surface. If the fog light is activated, however, then the tail lights illuminate completely. There is no animation when the vehicle is at a standstill and circuit 15 is off, as well as when individual system components of the vehicle rear lamps have failed.

In vehicles with CODE 550 (Trailer hitch), the trailer recognition control unit receives the flasher frequency and actuates the right turn signal light on the trailer over the trailer socket.

IMPORTANT The right turn signal can be overridden by the hazard warning flasher function, and vice versa.

Function sequence, one-touch turn signaling 

With regard to signal flow, the function sequence of the touch turn signal function corresponds to that of the left turn signal and right turn signal functions. The difference is in the triggering and ending of the turn signal procedure.

To trigger the touch turn signaling function, the combination switch must only be pressed briefly (t < 440 ms) in the desired turn signal direction. Three flashing cycles are then output by the front SAM control unit.

The one-touch turn signaling function is overridden when the hazard warning flasher function is actuated or the combination switch is activated in the opposite direction.

Function sequence, hazard warning flashing 

The hazard warning flasher function sequence is the same as that for turn signaling with regard to the signal flow.

However, all the turn signal lights and turn signal lamps on the vehicle are actuated synchronously.

IMPORTANT Model 217 as of model year 2018 with code 460 (Canada version)

Model 217 as of model year 2018 with code 494 (US version)

In contrast to turn signaling, the animation does not occur during hazard warning.

In addition to control messages in the instrument cluster, the hazard warning lights button (A40/9s3) in the Audio/COMAND control panel (A40/9) (except code 446 (Touchpad only)) or the hazard warning lights button (N72s3) in the lower control panel (N72) (with code 446 (Touchpad only)) are directly actuated by the front SAM control unit. Depending on the status of circuit 15, two duty cycles are output by the front SAM control unit:

IMPORTANT If the malfunction of a turn signal light or a turn signal lamp is detected during hazard warning flashing, the frequencies of the turn signal light indicators and instrument cluster speaker are not doubled.

The hazard warning flashing function encompasses the following subfunctions:

Function sequence for hazard warning flashing, manual 

The manual hazard warning flasher function is activated by pressing the hazard warning system button.

The front SAM control unit reads in the status of the hazard warning system button directly and initiates the hazard warning flashing function by issuing the flasher frequency.

Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

The indicator lamp in the hazard warning system button is also actuated directly by the front SAM control unit.

Additional function requirement for hazard warning flashing after maximum full-stop braking (except code 494 (USA version) and except code 460 (Canada version)) 

Function sequence for hazard warning flasher after emergency braking (except code 494 (USA version) and except code 460 (Canada version)) 

In the event of an emergency braking situation, the Electronic Stability Program control unit (N30/4) sends the "Emergency braking situation" (emergency braking) signal over the chassis FlexRay, electronic ignition lock control unit and the interior CAN to the front SAM control unit.

If the vehicle was then decelerated below a speed of v = 3 km/h, the front SAM control unit activates the hazard warning flashing function by issuing the flasher frequency. Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

The Electronic Stability Program control unit transmits the vehicle speed via the chassis FlexRay, the electronic ignition lock control unit and the interior CAN to the front SAM control unit.

The flashing is deactivated by pressing the hazard warning system button or upon exceeding a speed of v = 10 km/h.

Additional function requirements for hazard warning flasher during emergency stop (with code 23P (Driving Assistance package)) 

Function sequence for hazard warning flasher during emergency stop (with code 23P (Driving Assistance package)) 

During an emergency stop executed by the Active Emergency Stop Assist function, the Intelligent Drive control unit (N62/4) sends the "emergency stop" signal via the chassis FlexRay, electronic ignition lock control unit and interior CAN to the front SAM control unit.

The Electronic Stability Program control unit transmits the vehicle speed via the chassis FlexRay, the electronic ignition lock control unit and the interior CAN to the front SAM control unit.

As soon as the vehicle decelerates below a speed of v = 60 km/h due to an emergency stop, the front SAM control unit activates the hazard warning flasher function by issuing the flasher frequency. Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

As long as the speed does not undershoot v = 3 km/h, the hazard warning flasher is terminated with removal of the "emergency stop" signal. If the speed undershoots the threshold of v = 3 km/h one time, the hazard warning flasher continues to be executed regardless of the status of the "emergency stop" signal.

The hazard warning flasher is then only terminated if the hazard warning system button is actuated with the "emergency stop" signal not being set or if a speed of v = 10 km/h is overshot.

This function is not available in the following countries:

Additional function requirements for hazard warning flasher when airbag deployed 

Function sequence for hazard warning flasher when airbag deployed 

When an airbag is deployed or during a detected rollover of the vehicle, the supplemental restraint system control unit (N2/10) sends the crash signal via the user interface CAN, electronic ignition lock control unit and interior CAN as well as via a direct line to the front SAM control unit.

The front SAM control unit then initiates the hazard warning flasher function by issuing the flasher frequency. Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously. Operation of the hazard warning system button or unlocking of the central locking (CL [ZV]) system terminates the flashing.

The electronic ignition lock control unit sends the status of the central locking via interior CAN to the front SAM control unit.

Function sequence, feedback from locking/unlocking of central locking (CL) 

When the central locking system is locked/unlocked, the electronic ignition lock control unit requests the hazard warning flashing function. To this end, the electronic ignition lock control unit sends the status of the central locking over interior CAN to the front SAM control unit.

The front SAM control unit activates the hazard warning flashing function for one flasher cycle when the central locking system is unlocked, and for three flasher cycles when the central locking system is locked.

Function sequence for ATA [EDW] flashing (with code 551 (Anti-theft alarm system (ATA [EDW]))) 

When an ATA [EDW] alarm is triggered, the front SAM control unit initiates the hazard warning flashing function by issuing the flasher frequency.

Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

Function sequence for PRE-SAFE rear end flashing (with code 253 (Rear-end collision warning and protective system)) 

If a vehicle is detected in the traffic area behind the vehicle and is categorized as accident-critical, the rear SAM control unit actuates the rear turn signal lights (except code 460 (Canada version) and except code 494 (USA version)). This warns the driver of the vehicle approaching from the rear of a potential collision.

  Electrical function schematic, turn signal light actuation   PE82.10-P-2055-97SEA
  Overview of exterior lights system components   GF82.10-P-9998LF 
scientia non olet · About LEMON Manuals