For 1990-2009 cars
SIR Components
Sensors, Pretensioners, and Side Air Bags
Handling ESD Sensitive Parts Notice
SIR Caution

### Circuit Description

When you first turn ON the ignition, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM provides input power to the inflatable restraint side impact sensor (SIS). When input power is first detected, the SIS responds by performing internal diagnostics. Next the SIS sends an ID message to the SDM. The SDM will consider this to be a valid ID if the response time is less than 5 seconds after the SIS is powered up.The SIS will continually communicate a status message to the SDM. The SDM can reset the SIS by removing and applying power to it.

### Conditions for Running the DTC

• | Ignition 1 voltage is within the normal operating voltage range.

• | The SDM monitors the inflatable restraint side impact sensor loop with the ignition ON.

### Conditions for Setting the DTC

The SDM has received a NOK (not OK) message from the SIS.

### Action Taken When the DTC Sets

The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

### Conditions for Clearing the DTC

• | You can issue a clear codes command. However, the DTC will appear again in the next ignition cycle.

• | Replace the inflatable restraint side impact sensor (SIS).

### Diagnostic Aids

DTC B0080 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 test checks the communication status of the inflatable restraint side impact sensor.

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

Does the scan tool indicate that this DTC is current?

--

Go to Step 3

Go to Diagnostic Aids

3 | Replace the inflatable restraint side impact sensor (SIS). Refer to Inflatable Restraint Side Impact Sensor Replacement Did you complete the replacement? | -- | Go to Step 4 | --
4 |

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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