For 1990-2009 cars

### Circuit Description

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device which converts vehicle velocity changes to an electrical signal. The SDM processes the generated electrical signals and compares them to values stored in memory. When the generated signals exceed the stored value, the SDM performs additional signal processing and compares the generated signals to signals stored in memory. When two of the generated signals exceed the stored values, the SDM causes current to flow through the inflatable restraint side impact module - LF, deploying the side impact module - LF and causing DTC 68 to set.

### Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

### Conditions for Setting the DTC

The DTC will set when the SDM detects a side impact crash of sufficient force to warrant deployment of the side impact module - LF.

### Action Taken When the DTC Sets

• | The SDM turns the AIR BAG indicator ON.

• | The SDM records crash data.

### Conditions for Clearing the DTC

The SDM has the ability to command three side impact module deployments. After three commanded deployments, the SDM must be replaced.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: SIR Schematics
1 | Did you perform the Diagnostic System Check - SIR? | Go to Step 2 | Go to Diagnostic System Check - SIR
2 |

1. Turn OFF the ignition.
2. Inspect the vehicle for signs of side impact module - LF deployment.

Does the vehicle exhibit signs of side impact module - LF deployment?

Go to Step 5

Go to Step 3

3 | Inspect the side of the vehicle and undercarriage for signs of impact/collision. Does the vehicle show any signs of impact/collision? | Go to Step 5 | Go to Step 4
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 6 | --
5 |

1. Install a scan tool.
2. With a scan tool, observe the SIR DTC display.
3. If a history DTC exists, refer to Diagnostic Aids for that specific DTC and diagnose the problem.
4. The SDM has the ability to command three driver side impact module deployments. If this is the third commanded deployment, the SDM must be replaced. Replace the SDM only if this is the third commanded deployment. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
5. Replace components and perform inspections as required following an accident. Refer to Repairs and Inspections Required After a Collision .

Did you complete the action?

Go to Step 6

--

6 |

1. Reconnect all SIR components.
2. Use the scan tool in order to clear the DTCs.
3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK