The Passenger Presence System (PPS) is a calibrated system that requires rezeroing anytime the seat cushion trim attachments have been removed or the PPS has been replaced. Also, upon initializing the service kit, a DTC will be set and you must perform the rezeroing function in the scan tool. If the passenger seat has been steam cleaned, or been wet, or its relay humid, rezeroing may have to be performed after the seat has had a chance to dry out. It may take up to 48 hours for the seat to completely dry. The procedures below are designed to assist in the rezeroing of the PPS. Before you start, read these procedures carefully and completely. For further information regarding the PPS refer to SIR System Description and Operation .

Important: The following procedures must be followed:

Important: Before rezeroing the PPS, the front passenger seat must be completely empty of all items. The presence of any items on the front passenger seat will affect the calibration and operation of the PPS.

Important: When rezeroing the PPS, the instrument panel cluster (IPC) and dash lights will begin dimming on and off. This is normal operation during the rezeroing procedure and does not indicate additional system faults.

1. Empty the front outboard passenger seat.
2. Verify that all SIR and PPS components, connectors and connector position assurances (CPAs) are properly connected and mounted.
3. Install a scan tool.
4. Turn ON the ignition, with the engine OFF.

Important: PPS DTC 032 and DTC 056 may be set prior to performing the rezeroing function and will remain current until this procedure has been completed. All other SIR and PPS DTCs must be corrected and cleared before rezeroing the PPS. The presence of current or history DTCs will prevent the PPS from rezeroing and may set additional DTCs.

5. Use the scan tool in order to clear the SIR and PPS DTCs.
6. With a scan tool, request the passenger presence system (PPS) rezeroing procedure.
7. Initiate the PPS rezeroing procedure. The PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators located on the center of IPC until the rezeroing procedure has been completed.

•	When the rezeroing procedure has been successfully completed, the PPS will display the current system status on the PASSENGER AIR BAG ON/OFF indicators located in the center of IPC.

•	If the rezeroing procedure was unsuccessful, both PASSENGER AIR BAG ON and OFF indicators will alternate from no illumination to full illumination in 1 second intervals for 5 seconds. The PPS will treat an unsuccessful rezero attempt as a system fault.

8. If the rezeroing procedure was unsuccessful repeat this procedure. Due to the communication status between the SDM and the PPS module, this procedure may have to be repeated until a successful rezero attempt has been achieved.
9. After the PPS has been successfully rezeroed perform the Diagnostic System Check - Vehicle .