Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B0074 00: Passenger Occupant Classification SensorDTC B0074 0D: Passenger Occupant Classification Sensor Circuit Resistance Above Threshold
DTC B0074 0E: Passenger Occupant Classification Sensor Circuit Resistance Below Threshold
DTC B0074 0F: Passenger Occupant Classification Sensor Circuit Erratic (Wet Seat)
Diagnostic Fault Information
Circuit | Short to Ground | Low Resistance | High Resistance | Open | Short to Voltage | Performance |
|---|---|---|---|---|---|---|
Pressure Sensor Signal | -- | B0074 0E | B0074 0D | B0074 0D | -- | B0074 0F |
Pressure Sensor Voltage Reference | -- | B0074 0E | B0074 0D | B0074 0D | -- | -- |
Pressure Sensor Low Reference | -- | B0074 0E | B0074 0D | B0074 0D | -- | -- |
Circuit/System Description
The passenger presence system (PPS) sensor continually monitors itself and if a fault in this circuit occurs, a DTC will set. When the sensing and diagnostic module (SDM) detects this DTC within the PPS, it will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then disable the deployment of the instrument panel (I/P) module and then illuminate the AIR BAG warning indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | The PPS detects the voltage at the pressure sensor signal is less than 0.5 volts or greater than 4.5 volts for 500 milliseconds. |
| • | The PPS detects the voltage at the pressure sensor voltage reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds. |
| • | The PPS detects the amperage at the PPS sensor low reference is 25 mA or greater for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The SDM disables the I/P module deployment loop. |
| • | The SDM will illuminate the OFF portion of the PASSENGER AIR BAG ON/OFF indicator. |
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
• PPS pressure sensor • PPS pressure sensor wiring harness connector
- Verify that DTC B0074 0F is not set.
- Ignition OFF, disconnect the harness connector at the PPS sensor.
- Test for less then 10 ohms between the ground circuit terminal 4 and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
- Ignition OFF, disconnect the harness connector at the inflatable restraint rollover sensor.
- Test for infinite resistance between the signal circuit terminal 1 and ground.
- Ignition ON, test for less than 1 volt between the signal circuit terminal 1 and ground.
- Test for less than 1 ohm on the signal circuit between the PPS sensor terminal 1 and the rollover sensor terminal 3.
- Reconnect all PPS components and perform the Passenger Presence System Preload Test procedure.
- Clear DTCs, verify DTC B0074 is not set.
| ⇒ | If the DTC is set, verify the seat is dry. If the seat is wet, allow 24-48 hours dry time. |
| ⇒ | If greater then the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the signal circuit for open/high resistance. |
| ⇒ | If the DTC sets, replace the PPS sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PPS replacement, setup, and programming |
