GF54.30-D-2013H Output Acoustic Warning Messages, Function

GF54.30-D-2013H Output Acoustic Warning Messages, Function


General
There are 3 different acoustic signal types which are output by the instrument cluster (A1):
- Audible turn signal indicator (turn signal clicking)
- Gong
- Warning buzzer

Audible turn signal indicator (turn signal clicking)
The audible turn signal indicator is integrated in the instrument cluster. The turn signal flasher is always accompanied by an acoustic clicking sound generated in the same rhythm. The audible turn signal indicator is actuated differently depending on function:

Giving turn signals (turn signal clicking)
The signal for actuating the audible turn signal indicator when giving turn signals comes from the SAM control unit (N10) via the Controller Area Network bus class B (interior) (CAN-B).
If one of the turn signal lamps fails, the audible turn signal indicator is actuated at twice the frequency. The instrument cluster receives the information regarding the faulty turn signal lamp from the SAM control unit via CAN-B.

Operating hazard warning flashers (turn signal clicking)
The signal for actuating the audible turn signal indicator when operating the hazard warning flashers comes from the SAM control unit via CAN-B.

Lights-on warning (gong)
If the lights are on, circuit 15C is OFF and the driver door is open, the instrument cluster issues the lights-on warning.
Information flow:
- The door contact signal is read in by the driver door control unit (N69/1) and placed on CAN-B.
- The status of circuit 15 is placed on CAN-B by the EIS [EZS] control unit (N73).
- The light status is determined by the SAM control unit and placed on CAN-B.
- The instrument cluster reads in the signals from CAN-B and activates the gong.

Warning buzzer (A1h1)
The instrument cluster has a warning buzzer (A1h1) which outputs a warning tone for various faults and operating conditions.
A warning chime is emitted:
- For various warning messages which are shown on the display (A1p1) of the instrument cluster (e.g. if the coolant temperature enters the range which is critical for the engine).
- When the limiter is switched on if the set speed is exceeded e.g. on downhill gradients (vehicle overrun).
- When the parking brake warning lamp (A1e9) lights up if the vehicle is moving at 5 km/h or mph with the parking brake still applied. The actuating signal comes from the SAM control unit via CAN-B.
- If the seat belt warning lamp (A1e6) is actuated. The warning tone is issued intermittently (OFF and then ON again at intervals of t(on) = 5 s and t(off) = 3 s) until either the maximum actuation time of t = 95 s has expired or the seat belt warning lamp goes out.