Circuit Description
The inflatable restraint passenger presence system (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself and if a fault in this circuit occurs, DTC 065 will set. 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 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 065 PPS Sensor Circuit Out of Range
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | The PPS detects the voltage at the PPS sensor signal is less than 0.05 volt or greater than 4.5 volts for 500 milliseconds. |
| • | The PPS detects the voltage at the PPS 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 PPS sensor low reference is 25 ma or greater for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The PPS will set a DTC 065, then communicate with the SDM via non-class 2 circuit. |
| • | The SDM will set DTC B0092. |
| • | 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 between the PPS sensor signal, 5-volt reference, and low reference circuits |
| • | An open or high resistance between the PPS sensor signal, 5-volt reference, and low reference circuits |
| • | Inspect the PPS sensor signal, 5-volt reference, and low reference circuits carefully for cutting and/or chafing. |
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 .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step inspects the PPS pressure sensor connector.
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This step tests for a short to ground, a high resistance, or an open in the PPS sensor signal circuit.
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This step tests for a short to ground, a high resistance, or an open in the PPS sensor 5-volt reference circuit.
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This step tests for a short to ground, a high resistance, or an open in the PPS sensor low reference circuit.
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This step tests for a short to voltage in the PPS sensor signal circuit.
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This step tests the PPS sensor signal circuit input voltage range.
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This step tests for a short to voltage in the PPS sensor 5-volt reference circuit.
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This step tests for a short to voltage in the PPS sensor low reference circuit.
Step | Action | Value(s) | 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 | |
Does the PPS pressure sensor terminals or harness connector exhibit any signs of damage or corrosion? | -- | Go to Step 3 | Go to Step 4 | |
3 |
Did you complete the replacement? | -- | Go to Step 13 | -- |
4 |
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 5 |
Test the PPS sensor signal circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 6 | |
Test the PPS sensor 5-volt reference circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 7 | |
Test the PPS sensor low reference circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 8 | |
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 | |
Test the PPS sensor signal circuit input voltage. Refer to Circuit Testing and Wiring Repairs . Does the voltage measure within the specified range? | 0.05-4.5 V | Go to Step 10 | Go to Step 12 | |
Test the PPS sensor 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 | |
Test the PPS sensor low reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 | |
12 | Replace the PPS. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 13 | -- |
13 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
