For 1990-2009 cars

## DTC B0081 Base

### 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 3A: Passenger Presence System Incorrect Component Installed
DTC B0081 71: Passenger Presence System Invalid Serial Data Received/PPS Faulted

### Diagnostic Fault Information

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 | --

### Circuit/System Description

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.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

Any of the following conditions must exist for 5 seconds:

#### 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 from the PPS or the PPS is faulted.

### Action Taken When the DTC Sets

• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning indicator.

• | 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 were replaced verify that the correct part numbers were used for the vehicle application.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

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

1. Ignition ON, verify the PPS illuminates the PPS ON/OFF indicators.

⇒ | If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction.

2. Ignition ON, with the scan tool. Retrieve the DTCs, refer to Passenger Presence System Displaying Code Procedure. Verify no PPS DTCs are set.

⇒ | If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle.

3. Verify that the correct PPS was installed into the vehicle.

⇒ | If the wrong PPS was installed then replace with the correct PPS.

4. Ignition OFF, disconnect the harness connector at PPS module.
5. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 3 and ground.

⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance.

6. Ignition ON, engine ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.

⇒ | 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.

7. Ignition OFF, disconnect the harness connector at the SDM.
8. Test for less than 1.0 ohm along the occupant sensor serial data circuit terminal 1 to terminal 60.

⇒ | If greater than the specified range, test the signal circuit for an open/high resistance.

9. If all circuits test normal, test or replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | SIR/SRS Wiring Repairs

• | Control Module References for PPS and SDM replacement, setup, and programming

## DTC B0081 SS

### 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 3A: Passenger Presence System Incorrect Component Installed
DTC B0081 71: Passenger Presence System Invalid Serial Data Received/PPS Faulted

### Diagnostic Fault Information

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 | --

### Circuit/System Description

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.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

Any of the following conditions must exist for 5 seconds:

#### 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 from the PPS.

### Action Taken When the DTC Sets

• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning indicator.

• | 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 were replaced verify that the correct part numbers were used for the vehicle application.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

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

1. Ignition ON, verify the PPS illuminates the PPS ON/OFF indicators.

⇒ | If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction.

2. Ignition ON, with the scan tool. Retrieve the DTCs, refer to Passenger Presence System Flash Code Procedures. Verify no PPS DTCs are set.

⇒ | If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle.

3. Verify that the correct PPS was installed into the vehicle.

⇒ | If the wrong PPS was installed then replace with the correct PPS.

4. Ignition OFF, disconnect the harness connector at PPS module.
5. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 5 and ground.

⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance.

6. Ignition ON, engine ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 9 and ground.

⇒ | 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.

7. Ignition OFF, disconnect the harness connector at the SDM.
8. Test for less than 1.0 ohm along the occupant sensor serial data circuit terminal 18 to terminal 60.

⇒ | If greater than the specified range, test the signal circuit for an open/high resistance.

9. If all circuits test normal, test or replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | SIR/SRS Wiring Repairs

• | Control Module References for PPS and SDM replacement, setup, and programming