DTC 1049

DTC 1049 - 1050

Circuit Description

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects that the vehicle voltage is too low or high the PPS will then set a DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC 1049 PPS System Fault
* DTC 1050 PPS System Fault

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS has detected supply battery voltage too low or too high.

Action Taken When the DTC Sets

* The PPS will set a DTC 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 SDM commands the AIR BAG indicator ON via class 2 serial data.

Diagnostic Aids

DTC 1049 is an indication that the supply battery voltage (ignition 1) to the PPS too low and could be from corrosion and DTC 1050 is an indication that the supply battery voltage (ignition 1) to the PPS too high. The following are possible causes of the malfunction:

* A malfunctioning charging system
* High resistance in the PPS ignition 1 circuit
* The PPS connector
* A malfunctioning PPS

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

Test Description

Step 1 - Step 10:

The numbers below refer to the step numbers on the diagnostic table.
2. Inspect to see if DTC 1050 is set indicating that the supply battery voltage is too high.
3. Inspect to see if DTC 1049 is set indicating that the supply battery voltage is too low.
6. This step test's the PPS ignition 1 for high resistance or short to ground.