Warning lamp
An Airbag warning lamp is located at the cluster.
When key is in 'ignition on' position, the SRSCM performs diagnosis of overall airbag system. If there's no fault, airbag.
Warning lamp in the cluster flickers for a while and then goes out.
The SRSCM measures the voltage of the out terminal of the warning lamp to check if warning lamp is operated in accordance with signal SRSCM sends.