Crash signal

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:

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.