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

MODEL 204.0 /2 as of model year 2009 /YoM 08 

MODEL 204.3 

MODEL 204.9 

Function requirements, general 

• No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)

Turn signal actuation in 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.

With model 204.0/2 as of 1.3.11 and model 204.3 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), light-emitting diodes are used for the parking, standing and turn signal light functions.

To output the left parking, standing and turn signal light functions, the front SAM control unit actuates the left front standing light and parking light (E1e3) and the left front turn signal light (E1e5) over the left LED; signaling lights actuation module (E1n7).

To output the right parking, standing and turn signal light functions, the front SAM control unit actuates the right front standing light and parking light (E2e3) and the right front turn signal light (E2e5) over the right LED; signaling lights actuation module (E2n7). The LED, signaling lights actuation modules actuate the supply voltages for the LEDs.

The turn signal light actuation encompasses the following partial functions:

• Operational sequence turn indicators 
• Function sequence, hazard warning flashing 

Additional function requirements, turn signaling 

• Circuit 15R ON

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

Operational sequence turn indicators 

The turn signaling function encompasses the following subfunctions:

• Function sequence, left turn signal indicator 
• Function sequence, right turn signal indicator 
• Function sequence, touch turn signal indicator 

Function sequence, left turn signal indicator 

The left turn signal function is requested by pressing 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 "left flasher" request as a flasher frequency to the corresponding control units over the interior CAN and actuates the left front turn signal light, and on model 204.9, also 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 the left rear turn signal light (E3e1) in the left rear lamp unit (E3).

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, right turn signal indicator 

The right turn signal function is requested by pressing 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 "right flasher" request as a flasher frequency to the corresponding control units over the interior CAN and actuates the right front turn signal light, and on model 204.9, also 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 the right rear turn signal light (E4e1) in the right rear lamp unit (E4).

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 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.

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.

The respective active function is displayed for the driver by means of actuation of the left turn signal light indicator lamp (A1e1) or right turn signal light indicator lamp (A1e2) and the audible turn signal light function check (A1h2). The instrument cluster (A1) receives the flasher frequency sent by the front SAM control unit via interior CAN for this.

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 frequencies of the turn signal lights and the turn signal lamps f = 1.5 Hz remain the same.

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 lights on the vehicle are actuated synchronously. In addition to the displays in the instrument cluster the indicator lamp in the hazard warning flasher switch (S6/1s1) (model 204.0/2 up to 28.2.11, model 204.9) or in the hazard warning system button (N72/1s5) (model 204.0/2 as of 1.3.11, model 204.3) are 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:

• With circuit 15R On: light 58 %, dark 42 %
• With circuit 15R Off: light 35 %, dark 65 %

The hazard warning flashing function encompasses the following subfunctions:

• Function sequence, hazard warning flashing, manual 
• Function sequence, hazard warning flashing after emergency braking 
• Function sequence, hazard warning flashing for airbag deployment 
• Function sequence, hazard warning flashing in the event of crash detection 
• Function sequence, feedback from locking/unlocking the central locking (CL) (without code (494) USA version and without code (460) Canada version) 
• Function sequence, antitheft alarm system (ATA) flashing (with code (551) Antitheft alarm system (ATA)) 

Function sequence, hazard warning flashing, manual 

The hazard warning flasher function is manually requested through actuating 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. 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 

• Circuit 15 On (sent by electronic ignition lock control unit via interior CAN)
• Emergency braking within t = 500 ms recognized (vehicle speed v > 70 km/h and Brake Assist System active or vehicle deceleration a > 7.5 m/s² )

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 via chassis CAN 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 turn signal lamps are actuated at the same time on the vehicle.

The instrument cluster transmits the vehicle speed via interior CAN to the front SAM control unit.

The hazard warning flashing function for emergency braking is reset if one of the following conditions is met:

• Request of the manual hazard warning flasher function
• Vehicle speed v > 10 km/h

Additional function requirements, hazard warning flashing for airbag deployment 

• Deceleration a > 4 g

Function sequence, hazard warning flashing for airbag deployment 

If an airbag is deployed, the supplemental restraint system control unit (N2/10) transmits an appropriate signal to the front SAM control unit via the chassis CAN. The front SAM control unit initiates the hazard warning flasher function by means of issuing the flasher frequency via interior CAN.

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

This function is deactivated by operating the hazard warning system switch or the hazard warning system button.

Additional function requirements, hazard warning flashing for crash recognition 

• Deceleration a > 6 g

Function sequence, 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 flasher function by issuing the flasher frequency via interior CAN. This prevents activation of the local crash sensor is therefore prevented. All turn signal lights and turn signal lamps are actuated at the same time on the vehicle.

This function is deactivated by operating the hazard warning system switch or the hazard warning system button.

Function sequence, 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.

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 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) Antitheft alarm system (ATA) [EDW]) 

When an ATA [EDW] alarm is triggered, the rear SAM control unit requests the hazard warning flashing function via the interior CAN. The front SAM control unit generates a corresponding flasher frequency that is output via interior CAN. Following this, all turn signal lights and turn signal lights on the vehicle are actuated synchronously.

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