Diagnostic Instructions
| • | 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. |
DTC Descriptors
DTC B0081 39: Passenger Presence System Internal Electronic FailureDTC B0081 3A: Passenger Presence System Incorrect Component Installed
DTC B0081 71: Passenger Presence System Invalid Serial Data Received
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
PPS Module Serial Data | B0081 71 | B0081 71 | B0081 71 | B0081 71 | B0081 71 |
PPS Module Ground | -- | B0081 71 | B0081 71 | -- | -- |
PPS Module Ignition Voltage | -- | B0081 71 | B0081 71 | -- | -- |
Circuit/System Description
When the ignition is turned ON, the passenger presence system (PPS) module and the inflatable restraint sensing and diagnostic module (SDM) perform a series of self diagnostic tests critical to correct system operation. The SDM will establish communication with the PPS and request the PPS module to illuminate both of the PASSENGER AIR BAG ON/OFF indicators for 5 seconds. The SDM will then transmit a request message to the PPS module to send the PPS verification ID. The PPS module will transmit the verification ID to the SDM. The SDM compares 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 detects that the PPS has set a current DTC, DTC B0081 and the appropriate symptom byte sets.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
All of the following conditions must exist for 5 seconds:
B0081 39
The SDM has received a NOK message from the PPS module.
B0081 3A
| • | 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. |
B0081 71
The SDM has received invalid serial data or no serial data from the PPS module.
Action Taken When the DTC Sets
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator and display the message "Service Air Bag". |
| • | The I/P module deployment loop will be disabled. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
If either the SDM or PPS have been replaced, verify that the correct part numbers were used for the vehicle application.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, verify the passenger air bag ON/OFF indicators illuminate.
- Ignition ON, verify no PPS DTCs are set. Refer to Passenger Presence System Flash Code Procedures.
| ⇒ | If the indicators do not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction. |
| ⇒ | If any PPS DTCs are set as current or history, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Circuit/System Testing
Important: Refer to SIR Service Precautions.
When removing the connectors, inspect for terminal damage or corrosion. Inspect the connector body for damage to the locators that disengage the shorting bars when connected. Damage or corrosion to the following components requires repair or replacement of the affected component/connector:| • | PPS module and sensor |
| • | SDM module |
| • | SDM wiring harness connector |
- Ignition OFF, disconnect the harness connector at the PPS module.
- Ignition OFF, test for less then 5 ohms between the ground circuit terminal D and ground.
- Ignition ON, verify a test lamp illuminates between the ignition circuit terminal A and ground.
- Ignition OFF, disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1-volt between the PPS serial data circuit terminal B and SDM harness connector terminal 60.
- Test for infinite resistance between the PPS serial data circuit terminal B and ground.
- Test for less than 1 ohm between the PPS serial data circuit terminal B and SDM harness connector terminal 60.
- If all circuits test normal, replace the PPS module.
| ⇒ | If greater then the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition 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 circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PPS and SDM replacement, setup, and programming |
