Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 325 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPASSENGER PRESENCE SYSTEM REZEROINGPASSENGER PRESENCE SYSTEM (PPS) REZEROING PROCEDURETOOLS REQUIRED
2008 Pontiac Grand Prix Base
Tools Required
2008 Pontiac Grand Prix BaseSECTION Tools Required
WARNING: This page is about a different car, the 2008 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
EL-47729 Passenger Presence Seat Weights. See Special Tools .
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.
- Empty the front outboard passenger seat.
- Verify that all SIR and PPS components, connectors and connector position assurances (CPAs) are properly connected and mounted.
- Position the seat as follows:
- Seat at the rearmost position
- Seat back in upright position
- Headrest at its lowest position
- Seat at its lowest position
- Install a scan tool.
- Turn ON the ignition, with the engine OFF.
- Use the scan tool in order to clear the SIR and PPS DTCs.
- With a scan tool, request the Zero Point Calibration procedure.
- Initiate the zero Point Calibration procedure.
- When the rezeroing procedure has been completed, the sensitivity check must be performed as prompted on the scan tool.
Sensitivity Check: 27-33 kg (59.52-72.75 lbs)
- If the sensitivity check was not within specification, retighten the passenger seat bolts. Refer to Fastener Tightening Specifications . If after tightening the seat bolts the sensitivity is not within specification, replace the seat adjuster frame. Refer to Front Seat Cushion Frame Replacement (Passenger Side) or Front Seat Cushion Frame Replacement (Driver Side) .
IMPORTANT: The Sensitivity Check requires the use of EL-47729 Passenger Presence Seat Weights. See Special Tools . - When the rezeroing procedure has been completed, the sensitivity check must be performed as prompted on the scan tool.
- If the rezeroing procedure was unsuccessful repeat this procedure. If the rezeroing procedure is unsuccessful a second time, replace the seat adjuster frame. Refer to Front Seat Cushion Frame Replacement (Passenger Side) or Front Seat Cushion Frame Replacement (Driver Side) .
- After the PPS has been successfully rezeroed perform the Diagnostic System Check - Vehicle .
IMPORTANT:
All SIR and PPS DTCs must be cleared before rezeroing the PPS. The presence of current or history DTCs will prevent the PPS from rezeroing and may set additional DTCs.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.