PAB (Passenger airbag) module all consist of an inflator and cushion. The initiator (a gas generator igniting device) is part the inflator. When the vehicle is in a frontal or side crash of sufficient force to close the sensor of the SRSCM, current flows through the deployment loop. This current ignites the material and inflates the airbag.The passenger Airbag (PAB) is installed inside the dash and protects the front passenger in the event of a frontal crash. The SRSCM determines if and when to deploy the PAB but the front impact sensor (FIS) signal. The PAB is a two-stage device. If the crash algorithm determines that only the first stage is to be activated, the second stage will be automatically disposed of after a programmable time in milliseconds has elapsed since the first stage deployment. The SRS harness is wrapped in a yellow tube to be discriminated from other system harnesses. A shorting bar is included inside the wiring connectors of DAB, PAB, SAB and BPT inflator side. The shorting bar shorts the current flow the DAB, PAB, SAB and BPT module circuits when the connectors are disconnected. The circuits to the inflator module are shorted in this way to help prevent unwanted deployment of the airbag when servicing the airbag module.
The PAB squib circuit consists of the SRSCM, PAB. If it causes the airbag to deploy when the airbag deployment conditions are satisfied. The above DTCs are recorded when the short to battery is detected in the 2nd stage PAB squib circuit.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check current
? Short to battery in 2nd stage PAB circuit.
? Faulty Squib.
? Faulty SRSCM.
Enable Conditions
? Ignition "ON"
Threshold Value
? PAB resistance < 2 k?
Diagnostic Time
Qualification
? More than 4 sec
De-Qualification
? More than 9.6 sec
? The SRS current measuring can be cause of component malfunction. So the current value is not mentioned in Threshold value to prohibit measuring the current.
PAB circuit resistance(O)
Rs > 10 k?