For 1990-2009 cars

### 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 that they are within their respective normal resistance ranges.

### Conditions for Running the DTC

When the ignition voltage is within the normal operating voltage range, the SDM performs the internal malfunction checks to ensure that no malfunctions exist within the SDM.

### Conditions for Setting the DTC

The DTC will set when an internal malfunction 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

• | A Current DTC is latched. A Current DTC will clear when the SDM is replaced.

• | A History DTC can be cleared by using a scan tool.

### Diagnostic Aids

This DTC is an indication of an internal malfunction within the SDM.

### Test Description

Then numbers below refer to step numbers on the diagnostic table.

1. This step checks for a current DTC.

2. This step checks for a history DTC.

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

Does the scan tool indicate that this DTC is current?

--

Go to Step 4

Go to Step 3

3 | Does the scan tool indicate that this DTC is history? | -- | Go to Step 5 | --
4 |

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

Did you complete the replacement?

--

Go to Step 5

--

5 |

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

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