GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2006 🢒 LaCrosse 🢒 Restraints 🢒 SIR 🢒 Inflatable Restraint Passenger Presence System Replacement - Front

Removal Procedure

    Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.

    Caution: Replace the passenger presence system as a complete assembly to prevent possible injury to the occupant. All the components in the service kit are assembled and calibrated as a unit. Using only some of the components in the service kit will cause the passenger presence system to operate improperly.

  1. Disable the SIR system. Refer to SIR Disabling and Enabling .

    2. Object Number: 1282550 Size: SH
  2. Remove the seat cushion trim cover. Refer to Front Seat Cushion Cover Replacement in Seats.
  3. Remove the connector position assurance (CPA) and disconnect the electrical connectors from the electronic control unit (ECU) module.

    4. Object Number: 1282185 Size: SH

    Important: Note the location of the ECU attachment bolts and routing of the electrical harness. The location is different between seats with manual or power seat adjusters.

  4. Lift the seat cushion pad to access the ECU retaining bolts (3).
  5. Remove the bolts that retain the ECU (2) to the seat frame.
  6. If replacing the passenger presence system (PPS) with a service kit, it is necessary to remove the three screws holding the ECU to the bracket. The bracket will be unused.
  7. Remove the sensor assembly wiring harness attachments from the seat cushion frame. Note the location of the wire routing.
  8. Remove the passenger presence system from the seat.

Installation Procedures

    Object Number: 1282185 Size: SH
  1. Position the passenger presence system to the seat making sure to route the wiring correctly.
  2. Insert the wiring harness attachment clips into the cushion frame.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the three ECU retaining bolts that secure the ECU to the bracket.

    4. Tighten
    Tighten the bolts to 2 N·m (18 lb in).

  4. Install the ECU bracket retaining bolts (3) that secure the unit to the seat cushion frame.

    5. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1282550 Size: SH
  5. Connect the electrical connectors to the ECU module and install the CPA.
  6. Install the seat cushion trim cover. Refer to Front Seat Cushion Cover Replacement in Seats.
  7. Enable the SIR system. Refer to SIR Disabling and Enabling .
  8. Re-zero the passenger presence system. Refer to Passenger Presence System Rezeroing .
  9. Refer to Control Module References for programming and setup information.