Special signal system official and emergency service vehicles, function - GF82.25-P-0001S: Notes
MODEL 220
Official and emergency service vehicles
The special signal system on official and emergency service vehicles serves for controlling the light signals for emergency operations with beacon.
All functions are actuated by the special vehicle multifunction control module (SVMCM) (N26/9) in combination with the control module (PAS) and special signal system (N26/12) .
The status of the switch in the special signal system pushbutton control module (A48/1) is read in by the control module (HAS) and the special signal system (N26/12) and is indicated to the SVMCM over a discrete line. In the event of an emergency operation with beacon the SVMCM actuates the following lamps according to the control module coding:
- Blue light (E22/5)
- Front strobe light (SA)
- Front left and right high beams (E1e1, E2e1) or
- Front left and right fog lamps(E1e4, E2e4)
In addition the fanfares (H2) are actuated corresponding to the switch position of special signal system pushbutton control module (A48/1) and the fanfare horn pushbuttons (S110s5, S110s5):
| Switch position A48/1 | Optical signal | Acoustic signal |
|---|---|---|
| Position A | ON | OFF |
| Position B | ON | when the fanfare switch is actuated a tone sequence is played |
| Position B, switch pulled out | ON | Tone sequence is played permanently |
Special signal system without control module (PAS) and special signal system (N26/12)
If the control module (PAS) and special signal system (N26/12) is not present the special signal system pushbutton control module (A48/1) is replace by a beacon switch which is read in by the SVMCM. This switch is equipped with an LED which indicates the status of the blue light (switched on/not switched on). The LED is also actuated by the SVMCM.
Ambient-light-dependent optical signals for emergency operations with beacon
To prevent dazzling other traffic participants during emergency operations with beacon the front strobe lights flash alternately with the fog lamps, not with the high beams in the dark. For this purpose the SVMCM evaluates the status of the automatic light switch daylight sensor unit (B32/1) (CAN message from overhead control panel). This is done in consideration of the additional options, daytime running lamps and automatic headlamp switch-on, because unit switch-over from the high beams to fog lamps is accomplished only when it is actually dark.
Combination possibilities for optical signals (emergency operations with beacon)
In the following table all possible combinations are listed which are supported by the special vehicle multifunction control module (SVMCM) (N26/9) . They can be programmed with the STAR DIAGNOSIS tool.
Separate switch for control, read in by SVMCM; only present when control module (PAS) and special signal system (N26/12) is not installed.
| Combination possibilities | Blue light recognition (over N26/12) | Switch position | Light status | Fog lamp | High beam | Strobe light, front | Beacon |
|---|---|---|---|---|---|---|---|
| 1 | - | ON | - | - | - | Flashing 1 Hz | - |
| OFF | - | - | - | - | |||
| 2 | - | ON | - | Flashing 1 Hz | - | Flashing 1 Hz | - |
| - | OFF | - | - | - | - | - | |
| 3 | - | ON | Low beam off | - | Flashing 1 Hz | Flashing 1 Hz | - |
| - | ON | Low beam on | Flashing 1 Hz | - | Flashing 1 Hz | - | |
| - | OFF | - | - | - | - | - | |
| 4 | ON | - | Low beam on | - | Flashing 1 Hz | - | - |
| - | Low beam off | Flashing 1 Hz | - | - | - | ||
| OFF | - | - | - | - | - | - | |
| 5 | - | ON | Low beam off | - | Flashing 1 Hz | Flashing 1 Hz | ON |
| - | ON | Low beam on | Flashing 1 Hz | - | Flashing 1 Hz | ON | |
| - | OFF | - | - | - | - | OFF |
| Special vehicle multifunction control module (SVMCM), location/purpose/design/function | GF82.25-P-4102S | ||
| Special signal system pushbutton control module, location/purpose | GF82.25-P-2101S | ||
| Exterior lighting, function | GF82.10-P-0003A |