Diagnostic Instructions
DTC Descriptor
DTC 024 : PPS Ignition 1 Voltage Performance
Circuit/System Description
The Passenger Presence System (PPS) module has an ignition 1 voltage input. The PPS continually monitors itself for faults. If the voltage on this circuit falls below a certain threshold, the PPS will set DTC 024. When the PPS detects this
DTC within the PPS it will notify the customer of the enable/disable status by turning ON the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the sensing and diagnostic module (SDM) through a non-class 2 communications
circuit that a PPS fault is present. The SDM will then turn the AIR BAG indicator ON, and set DTC B0092 or B0098 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module.
Conditions for Running the DTC
The PPS detects ignition 1 voltage is less than 8 volts for 500 milliseconds.
Conditions for Setting the DTC
| • | The PPS detects the voltage at the passenger seat belt tension retractor sensor signal is less than 0.05 volt or greater than 4.5 volts for 500 milliseconds. |
| • | The PPS detects the voltage at the passenger seat belt tension retractor sensor 5-volt reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds. |
| • | The PPS detects the amperage at the passenger seat belt tension retractor sensor low reference is 25 ma or greater for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The PPS will set a DTC, and then communicate with the SDM. |
| • | The SDM will set DTC B0092 or B0098. |
| • | The SDM disables the I/P module deployment loop. |
| • | The PPS will turn ON the passenger air bag status OFF indicator. |
| • | The SDM commands the AIR BAG indicator ON via serial data communication. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 255 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
The PPS will set DTC 024 as a history code only, when the ignition voltage has fallen below 8 volts. This is a normal condition for DTC 024 and it should be diagnosed as a current DTC.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Electrical Information Reference
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 wiring harness connector |
- Ignition OFF, disconnect the PPS module connector.
- Test the PPS ground circuit for an open or high resistance. Verify that an open or high resistance does not exist.
| ⇒ | If any of the above conditions are found make the appropriate repair. |
- Test the PPS ignition 1 voltage circuit for a short to ground, an open, or high resistance. Verify that a short to ground, an open, or high resistance does not exist.
| ⇒ | If any of the above conditions are found make the appropriate repair. |
- Reconnect all PPS components. Use the scan tool to clear all PPS DTCs. Refer to
Passenger Presence System Flash Code Procedures
. Rezero the PPS, refer to
Passenger Presence System Rezeroing
. Verify DTC 024 does not exist.
| ⇒ | If DTC 024 reset replaced the PPS. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
