Diagnostic Instructions
DTC Descriptor
DTC 1051: PPS Initialization/Preload Fault
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 has been replaced the new PPS must run a preload test on the completed serviced seat before that vehicle
is released back to the customer. This test assures that completed serviced seat does not add any pressure to the seat surface that could influence the pressure profile of any occupant that is sitting in the seat. This test must be performed on an empty seat.
When a new PPS is installed a DTC will set indicating that a preload test needs to be preformed. If the PPS detects any preload DTC within the PPS, 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 then 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 will set this DTC when 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
• | When conditions for the DTC is set no longer exist, use CLEAR DTC function of the scan tool to clear the DTC. |
• | After 255 consecutive warm-up cycles without failure, the DTC will be cleared. |
Diagnostic Aids
When a new PPS and seat bottom foam has been installed, a DTC 1051 will be set indicating that the preload test procedure must be run.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Electrical Information Reference
Circuit/System Testing
- Ignition ON, use the scan tool. Go to the PPS menu, then retrieve the DTCs. Verify DTC 1051 does not set.
- Verify DTC 1052, 1053, 1054, or 1055 is set as current.
- Use the scan tool and perform
Passenger Presence System Preload Test
and then request codes. Verify that there is no preload DTC exist.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Refer to
Control Module References
for PPS replacement, setup and programming.