For 1990-2009 cars

• | SIR component location affects how a vehicle should be serviced. There are parts of the SIR system installed in various locations around a vehicle. To find the location of the SIR components refer to SIR Component Views.

• | There are several reasons for disabling the SIR system, such as repairs to the SIR system or servicing a component near or attached to an SIR component. There are several ways to disable the SIR system depending on what type of service is being performed. The following information covers the proper procedures for disabling/enabling the SIR system.

Condition | Action
--- | ---
If the vehicle was involved in an accident with an air bag deployment. | Disconnect the negative battery cable(s) *. Refer to Battery Negative Cable Disconnection and Connection.
When performing SIR diagnostics. | Follow the appropriate SIR service manual diagnostic procedure(s) *
When removing or replacing an SIR component or a component attached to an SIR component. | Disconnect the negative battery cable(s) *
If the vehicle is suspected of having shorted electrical wires. | Disconnect the negative battery cable(s) *
When performing electrical diagnosis on components other than the SIR system. | Remove the SIR/Air bag fuse(s) when indicated by the diagnostic procedure to disable the SIR system
* DTCs will be lost when the negative battery cable is disconnected.

#### Disabling Procedure - Negative Battery Cable

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Ignition OFF.
3. Disconnect the negative battery cable from the battery. Refer to Battery Negative Cable Disconnection and Connection.
4. Wait 2 minutes before removing the fuse.

#### Enabling Procedure - Negative Battery Cable

1. Ignition OFF.
2. Connect the negative battery cable to the battery. Refer to Battery Negative Cable Disconnection and Connection.
3. Ignition ON. The AIR BAG indicator will flash then turn OFF.
4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not operate as described. Refer to Diagnostic System Check - Vehicle.

#### Disabling Procedure - Air Bag Fuse

Important: The SDM may have more than one fused power input. To ensure there is no unwanted SIR deployment, personal injury, or unnecessary SIR system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator illuminates. This is normal operation, and does not indicate a SIR system malfunction.

1. Locate and remove the 10 amp fuse (1) supplying power to the SDM. Refer to SIR Schematics.
2. Wait 2 minutes before working on the system.

#### Enabling Procedure - Air Bag Fuse

1. Ignition OFF.
2. Install the 10 amp fuse (1) supplying power to the SDM. Refer to SIR Schematics.
3. Ignition ON. The AIR BAG indicator will flash then turn OFF.
4. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to Diagnostic System Check - Vehicle.