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

MODEL 207.3/4 as of model year 2014 

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 Each active function is displayed to the driver by actuating the left turn signal indicator lamp (A1e1) or the right turn signal light indicator lamp (A1e2) and the audible turn signal light function check (A1h2) in the instrument cluster (A1). To this end, the instrument cluster receives the flasher frequency sent by the front SAM control unit over the interior CAN. If a turn signal light or turn signal lamp fails, the frequency of the respective turn signal indicator lamp and the acoustic turn signal light function check in the instrument cluster doubles 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 over the interior CAN.

Function sequence for turn indicators 

The turn signaling function comprises 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) reads in the switch position of the combination switch directly and sends this via chassis CAN 1 (CAN E1) to the front SAM control unit.

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:

On vehicles without code (640) SAE dynamic LED headlamp for right-hand traffic and without code (641) Dynamic LED headlamp for left-hand traffic and without code (642) Dynamic LED headlamp for right-hand traffic, the front SAM control unit actuates the left front turn signal light (E1e5) in the left front lamp unit (E1) directly.

On vehicles with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic, the front SAM control unit sends the flasher frequency via chassis CAN 2 (CAN E2) to the left headlamp control unit (E1n9), which actuates the left turn signal light, parking light, side marker lamp and daytime running light (E1e18) accordingly.

The rear SAM control unit receives the flasher frequency and on vehicles without code (460) Canada version and without code (494) USA version, it actuates the left rear turn signal light (E3e1) in the left rear lamp unit (E3).

On vehicles with code (460) Canada version or code (494) USA version, the rear SAM control unit actuates the left brake light (E3e4) and the left taillight and brake light (E3e17).

The left front door control unit receives the flasher frequency and actuates the left outside mirror turn signal lamp (E6/5) in the left outside mirror (M21/1).

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 over 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 switch position of the combination switch and sends it to the front SAM control unit via chassis CAN 1.

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

On vehicles without code (640) SAE dynamic LED headlamp for right-hand traffic and without code (641) Dynamic LED headlamp for left-hand traffic and without code (642) Dynamic LED headlamp for right-hand traffic, the front SAM control unit actuates the right front turn signal light (E2e5) in the right front lamp unit (E2) directly.

On vehicles with code (640) SAE dynamic LED headlamp for right-hand traffic or code (641) Dynamic LED headlamp for left-hand traffic or code (642) Dynamic LED headlamp for right-hand traffic, the front SAM control unit sends the flasher frequency via chassis CAN 2 to the right headlamp control unit (E2n9), which actuates the right turn signal light, parking light, side marker lamp and daytime running light (E2e18) accordingly.

The rear SAM control unit receives the flasher frequency and on vehicles without code (460) Canada version and without code (494) USA version, it actuates the right rear turn signal light (E4e1) in the right rear lamp unit (E4).

On vehicles with code (460) Canada version or code (494) USA version, the rear SAM control unit actuates the right brake light (E4e4) and the right taillight and brake light (E4e17).

The right front door control unit receives the flasher frequency and actuates the right outside mirror turn signal lamp (E6/6) in the right outside mirror (M21/2).

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.

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 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.

IMPORTANT Substitute lamp actuation on vehicles without code (460) Canada version and without code (494) USA version:

If the left rear turn signal light fails, the left brake light is actuated as a substitute, and if the right rear turn signal light fails, the right brake light is actuated as a substitute.

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.

Along with the indicator lamps in the instrument cluster, the indicator lamp in the hazard warning system button (N72/1s5) in the UCP control unit (N72/1) is actuated by the front SAM control unit over 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 flasher function comprises 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 over the instrument panel LIN and activates the hazard warning flasher function by issuing a flasher frequency over the interior CAN. Afterwards all the turn signal lights and turn signal lamps on the vehicle are actuated synchronously.

Additional function requirements, hazard warning flashing after emergency braking 

Function sequence, hazard warning flashing after emergency braking 

In the event of emergency braking, the Electronic Stability Program control unit (N30/4) sends a corresponding signal over chassis CAN 1 to the front SAM control unit.

If the vehicle is 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 the turn signal lamps on the vehicle are actuated synchronously.

The instrument cluster sends the vehicle speed to the front SAM control unit over the interior CAN.

IMPORTANT This function is deactivated by pressing the hazard warning system button or 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 triggered, the supplemental restraint system control unit (N2/10) sends the crash signal via chassis CAN 1 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. Afterwards all the turn signal lights and turn signal lamps on the vehicle are actuated synchronously.

IMPORTANT This function is deactivated by pressing the hazard warning system button or by globally unlocking the central locking system.

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 activates the hazard warning flasher function by outputting the flasher frequency via interior CAN.

All turn signal lights and the turn signal lamps on the vehicle are actuated synchronously.

IMPORTANT This function is deactivated by pressing the hazard warning system button or by globally unlocking the central locking system.

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 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 is assessed as 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 sent 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 the turn signal lamps on the vehicle are actuated synchronously.

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