Circuit Description
The inflatable restraints 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC 024 PPS Ignition 1 Voltage Performance
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The PPS detects ignition 1 voltage is less than 8 volts for 500 milliseconds.
Action Taken When the DTC Sets
| • | The PPS will set a DTC 024, then communicate with the SDM via non-class 2 circuit. |
| • | 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 class 2 serial data. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
Diagnostic Aids
The following can cause an intermittent condition:
| • | A short in the ignition 1 voltage circuit |
| • | An open or high resistance in the ignition 1 voltage circuit |
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.
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.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step inspects the PPS module connector.
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This step inspects the main seat harness connector.
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This step tests the PPS ground circuit for an open or high resistance.
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This step tests the PPS ignition 1 voltage circuit for a short to ground, an open, or high resistance.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Did you find and correct the condition? | Go to Step 7 | Go to Step 3 | |
Did you find and correct the condition? | Go to Step 7 | Go to Step 4 | |
Test the PPS ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 | |
Test the PPS ignition 1 voltage circuit for a short to ground, an open, or high resistance. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 | |
6 | Replace the PPS. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
