Supplemental Inflatable Restraints

DTC 024

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 in Diagnostic Aids. Component Tests and General Diagnostics

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

Step 1 - Step 7:

The numbers below refer to the step numbers on the diagnostic table.
2. This step inspects the PPS module connector.
3. This step inspects the main seat harness connector.
4. This step tests the PPS ground circuit for an open or high resistance.
5. This step tests the PPS ignition 1 voltage circuit for a short to ground, an open, or high resistance.