GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Allure 🢒 Restraints 🢒 SIR 🢒 DTC 034

Circuit 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 and 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 class 2 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 through a non class 2 communications circuit that a PPS fault is present. The SDM will then turn the AIR BAG indicator ON, and set DTC B0092 indicating a problem within the PPS and will suppress the deployment of the instrument panel module (IPM). In some conditions DTC 056 will set along with DTC 034. The wet seat fault should be diagnosed first.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC 034 Wet Seat Fault

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

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, then communicate with the SDM via non class 2 circuit.
    • The PPS may also set DTC 056 indicating a PPS internal system fault has occurred.
    • The SDM will set DTC B0092.
    • The SDM disables the module (IPM) deployment loop.
    • The PPS will turn ON the passenger air bag status OFF indicator.
    • The SDM commands the AIR BAG indicator ON via class 2 serial data.

Conditions for Clearing the DTC
    • The condition responsible for setting the DTC no longer exists.
    • You issue a scan tool CLEAR DTCs command.
    • 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.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step is checking to see if DTC 034 is current or history.

    2.

  2. This step allows the PPS and seat cushion assembly to air dry, then reinstall the PPS and cushion assembly to see if the DTC sets again.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the SIR and Passenger Presence System (PPS) DTCs.
  4. Cycle the ignition OFF and back ON, with the engine OFF.

Does the DTC reset?

Go to Step 3

Go to Diagnostic Aids

3

  1. Use the scan tool in order to clear the SIR and PPS DTCs.
  2. Turn OFF the ignition.
  3. Remove the PPS and passenger seat bottom cushion assembly and allow to air dry (approximately 48 hours). Refer to Control Module References for replacement, setup, and programming.
  4. Reinstall the PPS and seat bottom cushion assembly.
  5. Turn ON the ignition, with the engine OFF.

Does the DTC reset?

Go to Step 3

--

4
  1. Turn OFF the ignition.

    2. Important: The PPS, heated seat element, and seat bottom cushion is only serviced as a complete kit.

  2. Replace the PPS. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 4

--

5
  1. Verify that all components, connectors and connector position assurances (CPAs) are properly mounted.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK