Passenger Presence System Rezeroing

Passenger Presence System Rezeroing

Introduction

The inflatable restraints passenger presence system is a calibrated system that requires rezeroing anytime the seat cushion trim attachments have been removed or the passenger presence system has been replaced. The procedures below are designed to assist in the rezeroing of the passenger presence system. Before you start, read these procedures carefully and completely. For further information regarding the passenger presence system refer to SIR System Description and Operation (Description and Operation).

Important: The following procedures must be followed:


1. Read this procedure carefully and completely.
2. The passenger presence system will not function properly if the passenger presence system rezeroing procedure is not performed.
3. Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) after successfully completing the rezeroing procedure to ensure the system is functioning properly.

Passenger Presence System Rezeroing Procedure

Important: Before rezeroing the passenger presence system, 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 passenger presence system.


Important: When rezeroing the passenger presence system, the instrument panel cluster, and Passenger Air Bag ON/OFF indicator 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 passenger presence system components, connectors, and connector position assurances are properly connected and mounted.
3. Install a scan tool.
4. Turn ON the ignition, with the engine OFF.

Important: All SIR and passenger presence system DTCs must be cleared before rezeroing the passenger presence system. The presence of current or history DTCs will prevent the passenger presence system from rezeroing and may set additional DTCs.


5. Use the scan tool in order to clear the SIR and passenger presence system DTCs.
6. With a scan tool, perform the Passenger Presence Rezeroing procedure.
7. The passenger presence system will illuminate both PASSENGER AIR BAG ON and OFF indicators until the rezeroing procedure has been completed.

* When the rezeroing procedure has been successfully completed, the passenger presence system will display the current system status.
* 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 passenger presence system will treat an unsuccessful rezero attempt as a system fault.

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