Crash signal
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
The airbag control module emits a signal to the alarm system control module no later than 35 seconds after pin S is switched on and until such a time as pin S is switched off again. This signal has a frequency of 10 Hz and indicates two states:
- Normal state (live signal) and
- Crash state
The two states differ in the pulse/duty ratio of the signal:
LIVE AND CRASH SIGNALS
| Live signal | 20 % high | 80 % low |
| Crash signal | 80 % high | 20 % low |
Signal evaluation begins 45 seconds after pin 86 S is switched on. If no signal is detected from the airbag control module, a corresponding fault is entered in the fault memory.