B0056

DTC B0056

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC B0056 00
- Passenger Frontal Airbag 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 ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

SIR System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information.


Circuit/System Testing

1. Ignition OFF, verify that the vehicle does not show any signs of inflator module or pretensioner deployment. .

• If the vehicle displays any signs of inflator deployment, refer to Repairs and Inspections Required After a Collision (Supplemental Inflatable Restraints) .

2. Verify DTC B0052, B0053, or B0055 is not set.

• If DTC is set , refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) .

3. Verify DTC B0056 is not set.

• If DTC is set, replace the SDM.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)