Passenger Airbag Question

[CTScott]

Originally Posted by severous01

maybe a loose switch in the buckle, or on the weight sensor...

From experience reverse engineering the passenger occupancy ECU to build my bypass module for people with aftermarket seats, I can say that it's not a loose connector.

The passenger occupancy ECU polls the sensors and the passenger seat belt switch every 100ms. If any of the 4 weight sensors or the buckle switch don't respond, it shuts down and flashes the passenger airbag off light. It won't reset from that state until the ignition is cycled.

For it to have done what you saw, it had to have weighed her as being under the limit for arming the airbag. If she is fairly light and was shifting in the seat or you hit a pretty good bump I could see the system disarming and then rearming the airbag.

Did the passenger seatbelt light come on as well?