Diagnostic Instructions
DTC Descriptor
DTC 034 : Wet Seat Fault
Circuit/System Description
The inflatable restraint Passenger Presence System (PPS) has several flexible conductive metal strips placed underneath the seat cushion trim. These sensor strips transmit and receive a low-level electric field. If the seat is saturated with liquid, the
PPS will detect a low resistance value between these sensor strips. If this occurs, allow seat to dry, it may take up to 48 hours for the seat to completely dry. Check if fault returns. If the PPS determines there is a wet seat condition the PPS
will communicate to the sensing and diagnostic module (SDM) through a non GMLAN communications circuit that a PPS fault is present. When the PPS detects this DTC within the PPS it will notify the customer of the enable/disable status by turning on the OFF indicator
on the PASSENGER AIR BAG ON/OFF indicators, then the PPS will communicate to the SDM that a PPS fault is present. The SDM will then turn the AIR BAG indicator ON, and set DTC B0081 indicating a problem within the PPS and will suppress the deployment of
the instrument panel (I/P) module. In some conditions DTC 056 will set along with DTC 034. The wet seat fault should be diagnosed first.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | Seat or seat trim/foam is saturated with liquid. |
| • | Low resistance values between sensor strips. |
Action Taken When the DTC Sets
| • | The PPS will set a DTC 034, and then communicate with the SDM via non GMLAN circuit. |
| • | The PPS will also set DTC 056 indicating a PPS internal system fault has occurred until the re-zeroing procedure was performed. |
| • | 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 GMLAN serial data. |
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. |
Diagnostic Aids
This fault indicates that the seat or seat trim/foam is saturated with liquid. If this DTC sets, verify the wet seat condition, let dry and see if fault returns. If DTC 056 is set along with DTC 034, diagnose the wet seat fault first.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Electrical Information Reference
Circuit/System Testing
Important: If DTC resets after rezeroing, it may be necessary to perform this rezeroing procedure several times.
- Ignition ON, use the scan tool. Use the scan tool to clear all SIR and PPS DTCs. Refer to
Passenger Presence System Flash Code Procedures
. Rezero the PPS, refer to
Passenger Presence System Rezeroing
. Verify DTC 034 exist.
- Remove the PPS and passenger seat bottom cushion assembly and allow to air dry (approximately 48 hours). Reinstall the PPS and seat bottom cushion assembly.
- Ignition ON, use the scan tool. Use the scan tool to clear all SIR and PPS DTCs. Refer to
Passenger Presence System Flash Code Procedures
. Rezero the PPS, refer to
Passenger Presence System Rezeroing
. Verify DTC 034 exist.
- Replace the PPS if DTC 034 reset.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
