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
- Battery Voltage Signal
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The scan tool displays 0-20 volts. This is the system voltage measured by the PPS module between the battery input and ground.
- Power Mode
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The scan tool displays the current power mode.
- PPS Fault Status
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The scan tool displays the current condition of the PPS system to determine if the SDM or PPS is causing the PPS Disabled condition.
- SDM Enable Status
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The scan tool displays the current status of the PPS system within the SDM. When disabled, SDM will default to deactivate the deployment loops related to the passenger airbags. PPS Fault Status and SDM Fault status should match.
- PPS Enable Status
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The scan tool displays the current status of the PPS system. This information is sent to the SDM for deactivation of the deployment loops related to the passenger airbags. PPS Enable Status and SDM Enable status should match.
- Passenger Classification
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The scan tool displays the calculated seat occupant status or need to re-zero.
- Passenger Status
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The scan tool displays the calculated seat occupant status including relationship to seat position.
- Pressure Sensor
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The scan tool displays the voltage determined by the weight/position of the seat occupant.
- Seat Belt Tension Sensor
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The scan tool displays voltage which is used to determine whether a child infant seat is mounted in the passenger seat or not.
- Primary Key Status
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The scan tool displays the status of the primary key based on the comparison between the SDM and the PPS. If the Status is other than Valid the PPS will not allow activation and should set a DTC.
- PPS Primary Key
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The scan tool displays primary key that the PPS has stored to memory.
- Received Primary Key
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The scan tool displays what the PPS received from the BCM as the primary key. The PPS then compares it to what it has stored to determine the Primary Key Status. The PPS Primary Key and Received Primary Key should match.
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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.