• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ Voltage Reference | B0081 71 | B0081 71 | -- | -- |
Serial Data | B0081 71 | B0081 71 | B0081 71 | -- |
Ground | -- | B0081 71 | B0081 71 | -- |
When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the passenger presence system (PPS). The PPS will respond by requesting both of the PASSENGER AIR BAG ON/OFF indicators to illuminate for 5 seconds. The SDM will then transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM, and the SDM will compare the ID received to data stored in memory. If the data stored in memory does not match the information transmitted by the PPS or the SDM has detects that the PPS has set a current DTC the SDM will then disable the instrument panel (I/P) module deployment loop, set DTC B0081 and illuminate the AIR BAG warning indicator.
The SDM sends a message to the PPS, when commanded by the scan tool to initiate the DTC retrieval process. This process will take some time, about 13 seconds. When the PPS receives a request for DTCs, it will illuminate both PASSENGER AIR BAG ON and OFF indicators. After the PASSENGER AIR BAG ON and OFF indicators have illuminated for 3 seconds, cycle the ignition OFF and then turn the ignition back ON. After the PPS receives this request for data, it will transmit the DTC data to the scan tool through the SDM. This data is accessible for one ignition cycle only. Do not turn the ignition OFF while displaying PPS DTCs.
Ignition voltage is between 9-16 volts.
Any of the following conditions must exist for 5 seconds:
• | The SDM has received an ID message from the PPS which does not match the ID stored in the SDM memory. |
• | The SDM has reset the PPS twice without detecting the correct ID message. |
The SDM has received invalid serial data from the PPS or the PPS is faulted.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning indicator. |
• | The I/P module deployment loop will be disabled. |
• | The condition for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
If either the SDM or PPS were replaced verify that the correct part numbers were used for the vehicle application.
SIR System Description and Operation
Control Module References for scan tool information
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• PPS module • SDM module • PPS wiring harness connector • SDM wiring harness connector
⇒ | If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction. |
⇒ | If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If the wrong PPS was installed then replace with the correct PPS. |
⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PPS module. |
⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for PPS and SDM replacement, setup, and programming |
• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ Voltage Reference | B0081 71 | B0081 71 | -- | -- |
Serial Data | B0081 71 | B0081 71 | B0081 71 | -- |
Ground | -- | B0081 71 | B0081 71 | -- |
When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the passenger presence system (PPS). The PPS will respond by requesting both of the PASSENGER AIR BAG ON/OFF indicators to illuminate for 5 seconds. The SDM will then transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM, and the SDM will compare the ID received to data stored in memory. If the data stored in memory does not match the information transmitted by the PPS or the SDM has detects that the PPS has set a current DTC the SDM will then disable the instrument panel (I/P) module deployment loop, set DTC B0081 and illuminate the AIR BAG warning indicator.
The SDM sends a message to the PPS, when commanded by the scan tool to initiate the DTC retrieval process. Both the PASSENGER AIRBAG ON and OFF indicators are illuminated. After the PPS receives this request for data, it will transmit the DTC to the scan tool through the SDM. This data is accessible while the ignition is ON. Do not turn the ignition OFF while displaying PPS DTCs.
Ignition voltage is between 9-16 volts.
Any of the following conditions must exist for 5 seconds:
• | The SDM has received an ID message from the PPS which does not match the ID stored in the SDM memory. |
• | The SDM has reset the PPS twice without detecting the correct ID message. |
The SDM has received invalid serial data from the PPS.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning indicator. |
• | The I/P module deployment loop will be disabled. |
• | The condition for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
If either the SDM or PPS were replaced verify that the correct part numbers were used for the vehicle application.
SIR System Description and Operation
Control Module References for scan tool information
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• PPS module • SDM module • PPS wiring harness connector • SDM wiring harness connector
⇒ | If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction. |
⇒ | If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If the wrong PPS was installed then replace with the correct PPS. |
⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PPS module. |
⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for PPS and SDM replacement, setup, and programming |