For 1990-2009 cars
SIR Components
Seat Belt Pretensioners, Side Inflatable Restraint Modules, and Sensors
SIR Handling Caution
Handling ESD Sensitive Parts Notice

### Circuit Description

When you first turn ON the ignition, the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM) performs tests to diagnose critical malfunctions within itself. Then, the SDM proceeds with the RESISTANCE MEASUREMENT test to measure the deployment loop resistances to ensure they are within their respective normal resistance ranges. Upon passing these tests, the energy reserve is charged and the firing transistors are tested. The SDM then goes into CONTINUOUS MONITORING mode. The SDM provides input power to the inflatable restraint side impact sensor (SIS). When input power is first detected, the SIS responds by perofrming internal diagnostics. Next, the SIS sends a OK/NOK message to the SDM to indicate proper operation.

### Conditions for Running the DTC

When the ignition voltage is within the normal operating voltage range, the SDM monitors the inflatable restraint side impact sensor and the circuits.

### Conditions for Setting the DTC

The DTC will set when an internal fault within the SIS has been detected by the SDM.

### Action Taken When the DTC Sets

The SDM turns ON the AIR BAG warning lamp.

### Conditions for Clearing the DTC

• | Current DTC

- | The SDM has detected correct operation

- | The SIS sends an OK message to the SDM

• | History DTC

- | You can issue a clear codes command

- | Once 255 malfunction free ignition cycles have occured

### Diagnostic Aids

This DTC is an indication of an internal failure within the SIS.

### Test Description

The following numbers refer to the step numbers in the diagnostic table:

1. This step checks to see if either DTC 83 or DTC 84 is present.

2. This step determines if there is a malfunctioning inflatable restraint side impact sensor (SIS) or if there is a malfunctioning SDM.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform A Diagnostic System Check - SIR? | -- | Go to Step 2 | Go to Diagnostic System Check - SIR
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that either DTC 83 or DTC 84 is current?

--

Go to Step 3

Go to Step 4

3 |

1. If DTC 83 is present, refer to DTC 83 Pass. Side Impact Sensor Short to Voltage .
2. If DTC 84 is present, refer to DTC 84 Pass. Side Impact Sensor Short to Ground .

Did you complete the repair?

--

Go to Step 7

--

4 |

1. Use the scan tool to request the SIR data list display.
2. Read the communication status of the passenger side impact sensor RH SIS MESSAGE STATUS.

Does the scan tool display the specified value?

NOK

Go to Step 5

Go to Step 6

5 |

1. Turn OFF the ignition.
2. Replace the inflatable restraint side impact sensor (RH). Refer to Inflatable Restraint Side Impact Sensor Replacement .

Did you complete the replacement?

--

Go to Step 7

--

6 |

1. Turn OFF the ignition.
2. Replace the inflatable restraint sensing and diagnostic and seat belt pretensioner module. Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement .

Did you complete the replacement?

--

Go to Step 7

--

7 |

1. Reconnect all SIR components.
2. Verify that all components and connectors are properly mounted.
3. Turn ON the ignition, with the engine OFF.
4. Use the scan tool in order to clear the DTCs.

Did you complete the action?

--

Go to Diagnostic System Check - SIR

--