DTC 065

DTC 065

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 volts 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.

TEST DESCRIPTION

Step 1 - Step 12:

Step 13:

The numbers below refer to the step numbers on the diagnostic table.
2. This step inspects the PPS pressure sensor connector.
5. This step tests for a short to ground, a high resistance, or an open in the PPS sensor signal circuit.
6. This step tests for a short to ground, a high resistance, or an open in the PPS sensor 5-volt reference circuit.
7. This step tests for a short to ground, a high resistance, or an open in the PPS sensor low reference circuit.
8. This step tests for a short to voltage in the PPS sensor signal circuit.
9. This step tests the PPS sensor signal circuit input voltage range.
10. This step tests for a short to voltage in the PPS sensor 5-volt reference circuit.
11. This step tests for a short to voltage in the PPS sensor low reference circuit.