GM Service Manual Online
For 1990-2009 cars only

Circuit Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. Then, the SDM provides input power to the inflatable restraint side impact sensor (SIS) - LF. When the input power is detected, the SIS responds by performing internal diagnostics. After that, 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.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

    â€¢ The SDM commands the AIR BAG indicator ON via Class 2 serial data.
    â€¢ The SDM attempts to reset the SIS.

Conditions for Clearing the DTC

    â€¢ The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
    â€¢ A history DTC will clear once 255 malfunction free ignition cycles have occurred.

Diagnostic Aids

DTC B0080 is an indication of an internal malfunction within the SIS.

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. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the SIR DTC display.

Does the scan tool indicate that DTC B0080 is current?

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn OFF the ignition.
  2. Replace the 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. 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