Input and output signals: Notes

Fig 1: Identifying Input And Output Control Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The illustration shows the control signals. In addition to these signals there is a repetitive diagnostic signal between the SRS module and all peripheral units in the safety system. When the SRS system is started, (when the ignition is switched on), the SRS module performs a system test after which the SRS indicator lamp in the combined instrument panel goes out. The SRS module then switches to monitor mode.