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.
Passenger Presence System Preload Test: Introduction
- Read this procedure carefully and completely.
- The PPS will not function properly if the PPS detects a preload within a region.
- Perform the Diagnostic System Check - Vehicle , after successfully completing the preload test procedure to ensure the system is functioning properly.
The Passenger Presence System (PPS) is a calibrated system that requires checking for preloads within each region when the system has been serviced or replaced. If the passenger seat bottom cushion or seat bottom trim has been serviced, reinstalled, or removed for any reason, the procedure below was designed to assist in checking for preloads 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 .
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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.