B0056

DTC B0056

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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. You cannot clear a latched code.

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.

Circuit/System Testing

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

• If the vehicle displays any signs of inflator deployment, Refer to Repairs and Inspections Required After a Collision.

2. Use a scan tool and observe the SIR DTC display. The scan tool should indicate DTC B0052, B0053, or B0055 is set.
3. Refer to Diagnostic Trouble Code (DTC) List - Vehicle and follow the repair for the DTC set. Diagnostic Trouble Code Descriptions

Repair Instructions

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