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Turn signal indicator actuation, function - GF82.10-P-3008CE

MODEL 204.0/2 as of model year 2009 

MODEL 204.3 

MODEL 204.9 

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 turn signal functions is the front SAM control unit with fuse and relay module (N10/1). 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 On model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic), the turn signal lights function is output via LEDs.

To output the left turn signal lights function, the front SAM control unit actuates the left front turn signal light (E1e5) in the left front lamp unit (E1) via the left front actuation module, LED exterior lighting (E1n7). To output the right turn signal lights function, the front SAM control unit actuates the right front turn signal light (E2e5) in the right front lamp unit (E2) via the right front actuation module, LED exterior lighting (E2n7). The actuation modules, LED exterior lighting control the supply voltage of the LEDs.

IMPORTANT Each active function is displayed for the driver by actuating the left turn signal light indicator lamp (A1e1) or the right turn signal light indicator lamp (A1e2) and the acoustic turn signal light function check (A1h2). For this purpose, the instrument cluster (A1) receives the flasher frequency transmitted by the front SAM control unit via interior CAN. If a turn signal light or turn signal lamp fails, the frequencies of the turn signal indicator lamps and the turn signal light function check in the instrument cluster double to f = 3 Hz. The flashing frequency of the turn signal lights and turn signal lamps of f = 1.5 Hz remains unchanged.

The turn signal light actuation encompasses the following partial functions:

Additional function requirements for turn signaling 

IMPORTANT The electronic ignition lock control unit (N73) sends the status of circuit 15 to the front SAM control unit via interior CAN.

Function sequence for turn indicators 

The turn signaling function encompasses the following subfunctions:

Function sequence, left turn signal indicator 

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 position of the combination switch and transmits it to the front SAM control unit via the chassis CAN (CAN E). The front SAM control unit receives this, sends the request "Left turn signaling" (flasher frequency) via interior CAN to the corresponding control units and actuates the left front turn signal light.

On model 204.9 up to 31.5.12, the front SAM control unit also actuates the left front side marker lamp (E1e6).

The left front door control unit (N69/1) receives the flasher frequency and actuates the left outside mirror turn signal lamp (E6/5).

The rear SAM control unit with fuse and relay module (N10/2) receives the flasher frequency and actuates on model 204 (except model 204.9 as of 1.6.12 with code (460) Canada version or code (494) USA version) the left rear turn signal light (E3e1) in the left rear lamp unit (E3).

On model 204.9 as of 1.6.12 with code (460) Canada version or code (494) USA version the rear SAM control unit actuates the left brake light (E3e4).

In vehicles with code (550) Trailer hitch, the trailer recognition control unit (N28/1) receives the flasher frequency and actuates the left turn signal light on the trailer via the trailer socket (X58).

Function sequence for right turn signal indicator 

The right turn signal function is requested by pushing the combination switch upward. The steering column tube module control unit directly reads in the position of the combination switch and transmits it to the front SAM control unit via the chassis CAN. The front SAM control unit sends the request "Right turn signaling" (flasher frequency) via interior CAN to the corresponding control units and actuates the right front turn signal light.

On model 204.9 up to 31.5.12, the front SAM control unit also actuates the right front side marker lamp (E2e6).

The right front door control unit (N69/2) 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 on model 204 (except model 204.9 as of 1.6.12 with code (460) Canada version or code (494) USA version) the right rear turn signal light (E4e1) in the right rear lamp unit (E4).

On model 204.9 as of 1.6.12 with code (460) Canada version or code (494) USA version the rear SAM control unit actuates the right brake light (E4e4).

The trailer recognition control unit receives the flasher frequency and actuates the right turn signal light on the trailer via the trailer socket.

Function sequence, touch turn signal indicator 

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. The combination switch must only be operated briefly (t < 440 ms) in the desired turn signal direction. Three flashing cycles are output by the front SAM control unit. The touch turn signaling function is interrupted by means of actuation of the hazard warning flasher function or activation of the combination switch in the opposite direction.

Function sequence, hazard warning flashing 

The function sequence for the hazard warning flasher is identical to that for turn signaling in terms of signal flow. However, all the turn signal lights and turn signal lamps on the vehicle are actuated synchronously. In addition to the indications in the instrument cluster, the indicator lamp is actuated in the hazard warning flasher switch (S6/1s1) (model 204.0/2 up to 28.2.11, model 204.9) in the instrument panel switch group (S6/1) or in the hazard warning system button (N72/1s5) (model 204.0/2 as of 1.3.11, model 204.3) in the upper control panel control unit (N72/1) by the front SAM control unit via the instrument panel LIN (LIN 1).

Depending on the status of circuit 15, two duty cycles are output by the front SAM control unit:

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 flasher switch or the hazard warning system button. The front SAM control unit reads in the status of the hazard warning flasher switch or the hazard warning system button over the instrument panel LIN. Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

Additional function requirements for hazard warning flashing after emergency braking 

Function sequence for hazard warning flashing after emergency braking 

In the event of emergency braking, the Electronic Stability Program control unit (N30/4) sends an appropriate signal via chassis CAN to the front SAM control unit. If the vehicle was decelerated below the speed threshold of v = 3 km/h due to the emergency braking, the front SAM control unit activates the hazard warning flasher function by means of issuing the flasher frequency via interior CAN. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle. The instrument cluster sends the vehicle speed to the front SAM control unit over the interior CAN. This function is deactivated by pressing the hazard warning flasher switch or the hazard warning system button or upon exceeding a speed of v = 10 km/h.

Additional function requirements for hazard warning flashing for airbag deployment 

Function sequence for hazard warning flashing for airbag deployment 

If an airbag is deployed, the supplemental restraint system control unit (N2/10) sends an appropriate signal via chassis CAN to the front SAM control unit. The front SAM control unit then actuates the hazard warning flashing function by means of outputting the flasher frequency over the interior CAN. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle. This function is deactivated by pressing the hazard warning flasher switch or the hazard warning system button or by globally unlocking the central locking.

Additional function requirements for hazard warning flashing for crash recognition 

Function sequence for hazard warning flashing in the event of crash detection 

A crash sensor is integrated into the front SAM control unit. If this detects a crash event during a time-out of the supplemental restraint system control unit, the front SAM control unit initiates the hazard warning flashing function by issuing the flasher frequency via interior CAN. This serves to avoid any inadvertent activation of the local crash sensor. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle. This function is deactivated by pressing the hazard warning flasher switch or the hazard warning system button or by globally unlocking the central locking.

Function sequence for feedback from locking/unlocking the CL (without code (494) USA version and without code (460) Canada version) 

When the central locking system is locked/unlocked, the electronic ignition lock control unit requests the hazard warning flashing function via the interior CAN. 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. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle.

IMPORTANT All vehicle doors must be closed in order to output the hazard warning flashing function. The trunk lid (model 204.0/3) or the liftgate (model 204.2/9) is considered a vehicle door.

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

If an ATA [EDW] alarm is triggered, the rear SAM control unit requests the hazard warning flasher function over the interior CAN. This request must be transmitted cyclically so that the flasher frequency results from the bright time and the cycle time. The front SAM control unit receives this request, and then generates a corresponding flasher frequency which is sent over the interior CAN. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle.

  Electrical function schematic, turn signal light actuation MODEL 204.0/2 as of model year 2009MODEL 204.3MODEL 204.9 up to model year 2013 PE82.10-P-2055-97FAB
MODEL 204.9 as of model year 2013 PE82.10-P-2055-97FAC
  Overview of exterior lights system components   GF82.10-P-9998CE 
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