When the ignition switch is activated, the PPS (Passenger Presence System) and SDM (Inflatable Restraint Sensing and Diagnostic Module) perform various tests to diagnose critical faults. Once the SDM completes the ignition mode, communication is established with the Passenger Presence System, which will respond by commanding the two On-Off indicators of the passenger airbag for 5 seconds
The SDM transmits a request message to the PPS, requesting a system verification ID. Once this ID is received, the module compares it with the data stored in its memory. If the stored data does not match the information sent by the PPS, a fault code will be set indicating system failure
When the B0081 OBDII code is set, it is due to erratic operation found by the Passenger Presence System.