B0074

DTC B0074

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 01: Passenger Occupant Classification Sensor Circuit Short to Battery.
DTC B0074 02: Passenger Occupant Classification Sensor Circuit Short to Ground.
DTC B0074 08: Passenger Occupant Classification Sensor Circuit Signal Invalid.
DTC B0074 11: Passenger Occupant Classification Sensor Circuit Above Maximum Threshold.

Circuit/System Description

The passenger presence system (PPS) uses a sensor mat located underneath the passenger seat cushion to measure the weight of the occupant sitting in the front passenger seat. The PPS continually monitors itself and if a fault occurs, a DTC will set. When the PPS detects a fault, it will turn ON 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 suppress the deployment of the instrument panel (I/P) module and then turn the AIR BAG indicator ON.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The PPS detects a failure within itself.

Action Taken When the DTC Sets

- The PPS will set a DTC, and then communicate with the SDM via serial data communications.
- The SDM disables the I/P module deployment loop.
- The PPS will turn ON the passenger air bag status OFF indicator.
- The SDM commands ON the AIR BAG warning lamp via serial data communications.

Conditions for Clearing the DTC

- The condition responsible for setting the DTC no longer exists.
- A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

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:
- The PPS module.
- The PPS module wiring harness connector.

1. Ignition OFF, Disconnect the PPS module harness connector.
2. Ignition OFF, test for less then 1 ohm of resistance between the PPS sensor ground circuit and ground.
-> If greater then the specified range, test the circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the PPS B + circuit terminal A and ground.
-> If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. if circuit tests normal, replace the PPS.
4. Reconnect all PPS components and perform the Passenger Presence System Preload Test.
5. Verify DTC B0074 does not exist.
-> If DTC B0074 is set, replace the PPS.