The passenger side SRS airbag cut off switch is installed to the inner side of the glove box, and it is used to select the deployment permission or deployment inhibition for the passenger airbag and passenger side airbag. Based on the ON or OFF signal from the passenger side SRS airbag cut off switch, the SRS control unit illuminates the passenger side SRS airbag OFF indicator light or passenger side SRS airbag ON indicator light. If the SRS control unit detects a malfunction in the passenger side SRS airbag cut off switch signal circuit, the DTC is set.