GF82.10-P-3008CW Turn Signal Indicator Actuation, Function
GF82.10-P-3008CW Turn Signal Indicator Actuation, Function
General turn signal actuation function sequence
The turn signal actuation is comprised of several subfunctions. These are:
^ Turn signals
^ One-touch turn signaling
^ Hazard warning flashing
^ Requests from other systems
Turn signals
Function requirements:
^ C. 15R On
Operational sequence turn indicators
The position of the combination switch (S4) is read in by the steering column tube module control unit (N80) and forwarded via chassis CAN to the front SAM control unit with fuse and relay module (N10/1).
In its role as master control unit, the front SAM control unit transmits each request for all the turn signal functions on the interior CAN.
The turn signal procedure is ended following automatic reset when the vehicle is countersteered or through manual reset of the combination switch.
Left turn signal:
The front SAM control unit actuates the left front turn signal light (E1e5) in the left front lamp unit (E1). The left front door control unit (N69/1) actuates the left outside mirror turn signal lamp (E6/5). The rear SAM control unit with fuse and relay module (N10/2) actuates the left rear turn signal light (E3e1) in the left rear lamp unit (E3).
Right turn signal:
The front SAM control unit actuates the right front turn signal light (E2e5) in the right front lamp unit (E2). The right front door control unit (N69/2) actuates the right outside mirror turn signal lamp (E6/6). The rear SAM control unit actuates the right rear turn signal light (E4e1) in the right rear lamp unit (E4).
On vehicles with code (550) Trailer hitch, the trailer recognition control unit (N28/1) actuates the turn signal lights on the trailer via the trailer socket (X58).
Feedback:
The instrument cluster (A1) receives the turn signal indicator requests from the front SAM control unit via interior CAN and actuates the left turn signal lights indicator lamp (A1e1) or the right turn signal lights indicator lamp (A1e2) and the acoustic turn signal light function check (A1h2) an.
The flashing frequency is f = 1.5 Hz with a light/dark duty cycle of 52 % to 48 %.
If a faulty turn signal light or turn signal lamp is detected, the frequencies of the turn signal lights indicator lamp and the acoustic turn signal light function check in the instrument cluster double. The frequency of the turn signal lights and turn signal lamps remains at f = 1.5 Hz.
One-touch turn signaling
Function requirements:
^ C. 15R On
Turn signal lamp touch control, function sequence
The operational sequence for the turn signal lamp touch control is the same, in relation to the signal flow, as that for the turn signal indicator. The difference lies in the triggering and ending of the turn signal procedure.
For one-touch turn signaling, the combination switch may only be moved briefly (t < 440 ms) into the desired turn signal direction. Provided the combination switch does not click into place, it triggers 3 turn signaling cycles.
One-touch turn signaling is ended by triggering the hazard warning flasher function or by operating the combination switch in the opposite direction.
Hazard warning flashers
The hazard warning flashers can be actuated as follows:
^ Manual activation
^ Automatic activation in event of airbag deployment
^ Automatic activation in the event of a crash (severe accident)
^ Requests from other systems
Manual activation
Function requirements:
^ Circuit 30
Function sequence for activating manually
Hazard warning flashing is activated by pressing the hazard warning flasher switch (S6/1s1). The hazard warning flasher switch is read in by the front SAM control unit via instrument panel LIN.
The function sequence for the hazard warning flasher is identical to that for turn signaling in terms of signal flow. However, the turn signal lights and turn signal lamps on both sides of the vehicle are actuated. The hazard warning flashing frequency is f = 1.5 Hz.
The duty cycle is dependent on the position of the transmitter key (A8/1) in the electronic ignition lock control unit (N73):
^ Circuit 15R ON: light 58 %, dark 42 %
^ Circuit 15R OFF: light 35 %, dark 65 %
Feedback:
In addition to the displays in the instrument cluster, the front SAM control unit actuates the indicator lamp in the hazard warning flasher switch via instrument panel LIN.
Automatic activation in event of airbag deployment
Function requirements:
^ Deceleration a > 4 g
Function sequence for automatic activation in event of airbag deployment
When an airbag is deployed, the supplemental restraint system control unit (N2/10) transmits a signal via chassis CAN to the front SAM control unit for actuation of the turn signal lights and turn signal lamps.
This function is deactivated by operating the hazard warning flasher switch or by globally unlocking the central locking system.
Automatic activation in the event of a crash (severe accident)
Function requirements
^ Circuit 15R
^ Deceleration a > 6 g
Function sequence, automatic activation in the event of a crash (severe accident)
If the crash sensor integrated in the front SAM control unit recognizes a crash event, it transmits a signal for actuation of the turn signal lights and turn signal lamps.
This function is deactivated by operating the hazard warning flasher switch or by globally unlocking the central locking system.
Requests from other systems
^ When locking/unlocking the vehicle via the central locking system
^ when triggering the anti-theft alarm system (ATA [EDW]) (with code (551) Anti-theft alarm system (ATA [EDW])
^ when activating the panic alarm (with code (763) Radio remote control with panic switch)
^ and following an emergency stop (reduction of speed from ≥70 km/h to v = 5 km/h in a certain period of time) visual feedback is also provided via the turn signal lights and the turn signal lamps.
