Diagnostic Instructions
DTC Descriptor
DTC B0056 00: Passenger Frontal Air Bag Suppressed
Circuit/System Description
When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The PPS is used to monitor the weight of an occupant in
the front passenger seat. If the pressure from the occupant's weight is less than a specified value or an empty seat is detected, the PPS module will send a suppress signal to the SDM to disable the instrument panel (I/P) module. When the PPS detects a fault
within itself, then the PPS will communicate to the SDM through GMLAN communications that a PPS fault is present. The SDM will suppress the deployment of the module and then turn the AIR BAG indicator ON.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
This DTC is set when the SDM has commanded an air bag deployment while the PPS has determined that the front passenger seat has one the following conditions:
• | The pressure from the occupant's weight is less than a specified value. The PPS module sent a suppress signal to the SDM to suppress the I/P module. |
• | Empty front passenger seat |
• | A PPS fault was detected. |
Action Taken When the DTC Sets
• | The SDM sets a DTC B0056. |
• | DTC B0052, B0053, or B0055 will set along with this DTC. |
• | The SDM commands ON the AIR BAG warning lamp via serial data communications. |
Conditions for Clearing the DTC
This code will set along with one of the following latched codes: DTC B0052, B0053, or B0055 and cannot be cleared.
Diagnostic Aids
This code set because the PPS commanded to suppress the I/P module when the vehicle was involved in a collision and the SDM has commanded an air bag deployment.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, verify that the vehicle does not show any signs of inflator module or pretensioner deployment.
- With a scan tool, verify DTC B0052, B0053, or B0055 is not set.
- With a scan tool, clear DTCs, verify DTC B0056 is not set.
⇒ | If DTC is set , replace the SDM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
SIR/SRS Wiring Repairs