Conditions For Setting DTC

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

DTC sets when voltage at PSIR suppression switch enable and disable terminals are not within specified ranges.

DTC will set if:

IGNITION POSITIVE VOLTAGE is within normal operating range.
PSIR suppression switch enable circuit is not shorted to voltage.
PSIR suppression switch disable circuit is not shorted to voltage.
Voltage at PSIR suppression switch enable terminal is high with PASSENGER AIR BAG LED ON and voltage at PSIR disable terminal is low.