Diagnostic Instructions
DTC Descriptor
DTC 1063: Discard System
Circuit/System Description
The passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicates the profile classification to the sensing and diagnostic module (SDM). The SDM will either
enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects this DTC within itself, the PPS will communicate to the SDM through a non GMLAN communications circuit that a PPS fault
is present. The SDM will then set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the I/P module and turn the AIR BAG indicator ON.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
The PPS has detected an internal fault and must be replaced.
Action Taken When the DTC Sets
| • | The PPS will set a DTC, and then communicate with the SDM via non GMLAN circuit. |
| • | The SDM will set DTC B0081. |
| • | The SDM disables the I/P module deployment loop. |
| • | The PPS will turn ON the passenger air bag status OFF indicator. |
| • | The SDM commands the AIR BAG indicator ON via serial data communications. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 255 malfunction-free ignition cycles have occurred. |
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 Verification
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected
| • | PPS module wiring harness |
Verify that DTC 1063 is not present.
| ⇒ | If DTC is set, replace the PPS module. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
