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

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

Turn signal actuation in general
The turn signal light actuation comprises all functions for output of the turn signal indicator, various warnings and feedback. The master control unit for all turn signal functions is the steering column tube module (N80).
The steering column tube module prioritizes all incoming flashing functions and places a flasher frequency with the time period of the bright phase of the turn signal lamps on the interior CAN.

The flashing frequency is f = 1.5 Hz with a bright/dark duty cycle of 52 % to 48 %.

Turn signal light actuation is comprised of the following subfunctions:
^ Operational sequence turn indicators
^ Function sequence, hazard warning flashing

Additional function requirements, turn signaling
^ C. 15R On

Operational sequence turn indicators
The turn signaling function is comprised of 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 steering column tube module reads in the switch position of the combination switch (S4) directly and places a flasher frequency on the interior CAN. The driver-side SAM control unit (N10/10) receives the flasher frequency and actuates the left turn signal light (E1e5) in the left front lamp unit (E1). The rear SAM control unit (N10/8) receives the flasher frequency and actuates the left turn signal light (E3e1) in the left taillamp (E3). The left door control unit (N69/1) receives the flasher frequency and actuates the left outside mirror turn signal lamp (E6/5).

Function sequence, right turn signal indicator
The steering column tube module reads in the switch position of the combination switch directly and places a flasher frequency on the interior CAN.
The front passenger-side SAM control unit (N10/11) receives the flasher frequency and actuates the right turn signal light (E2e5) in the right front lamp unit (E2). The rear SAM control unit receives the flasher frequency and actuates the right turn signal light (E4e1) in the right taillamp (E4). The right door control unit (N69/2) receives the flasher frequency and actuates the right outside mirror turn signal lamp (E6/6).

Function sequence, touch turn signal indicator
The function sequence of touch turn signal indicating corresponds, in terms of the signal flow, to that of left and right turn signaling. The difference lies in the triggering and ending of the turn signal procedure.
The combination switch must only be operated briefly (t < 500 ms) in the desired turn signal direction. Three flashing cycles are output by the steering column tube module.

Touch turn signal indicating is terminated by the triggering of the hazard warning flasher function or by the actuation of the combination switch in the opposite direction. Via the interior CAN the instrument cluster (A1) receives the flasher frequency transmitted by the steering column tube module and actuates the left turn signal indicator lamp (A1e1) or the right turn signal indicator lamp (A1e2) and the audible turn signal indicator (A1h2). If the failure of a turn signal light or turn signal lamp is detected, the frequencies of the turn signal indicator lamp and audible function check in the instrument cluster double. The flashing frequency of the turn signal lights and turn signal lights of f = 1,5 Hz continues to remain.

Function sequence, hazard warning flashing
The hazard warning flashing function is comprised of the following subfunctions:
^ Function sequence, hazard warning flashing
^ Function sequence, hazard warning flashing for airbag deployment
^ Function sequence, feedback from locking/unlocking of central locking (CL)
^ Function sequence for anti-theft alarm system (ATA [EDW]) - turn signal indicating

Function sequence, hazard warning flashing
Hazard warning flashing is activated by operating the hazard warning system switch (S6/5s1) in the hazard warning flasher and CL [ZV] switch group (S6/5). The status of the hazard warning system switch is read in directly by the lower control panel control unit (N72) and forwarded to the steering column tube module via the interior CAN. 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.

Two duty cycles are output by the steering column tube module depending on the position of the transmitter key (A8/1) in the EIS [EZS] control unit (N73):
- With circuit 15R On: bright 58 %, dark 42 %
- With circuit 15R Off: bright 35 %, dark 65 %

In addition to the displays in the instrument cluster, the active hazard warning flashing function is indicated by the indicator lamp in the hazard warning system switch. The corresponding signal is transmitted by the steering column tube module via the interior CAN to the lower control panel control unit, which actuates the indicator lamp in the hazard warning system switch.

Additional function requirements, hazard warning flashing for airbag deployment
^ Deceleration a > 4 g

Function sequence, hazard warning flashing for airbag deployment
In the event of an airbag deployment the restraint systems control unit (N2/7) transmits a corresponding signal to the lower control panel control unit via the interior CAN.
The lower control panel control unit transmits the hazard warning flashing function request to the steering column tube module via the interior CAN.

The steering column tube module forwards the hazard warning flashing function by outputting the flasher frequency on the interior CAN.
This function is deactivated by operating the hazard warning system switch.

Function sequence, feedback from locking/unlocking of central locking (CL)
When the CL is locked/unlocked the hazard warning flashing function is requested by the electronic ignition switch control unit via the interior CAN. When the CL [ZV] is unlocked, the steering column tube module activates the hazard warning flashing function for one flasher cycle, when locking three flasher cycles are output.

Function sequence ATA flashing
When an ATA [EDW] alarm is triggered, the hazard warning flashing function is generated by the driver-side SAM control unit and initiated by outputting the corresponding flasher frequency on the interior CAN.
All the turn signal lights and turn signal lamps on the vehicle are then actuated synchronously.