GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 DTC 🢒 DTC 043

Circuit Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) flashes the AIR BAG indicator seven times. The SDM performs diagnostic tests on the SIR system and then turns the AIR BAG indicator OFF if no SIR malfunctions exists. If the ignition 1 voltage is outside of the normal operating range (9 - 16 volts), the SDM will turn the AIR BAG indicator ON with no DTCs present. The SDM monitors the AIR BAG indicator control circuit by comparing the output state of the AIR BAG indicator control circuit to the microprocessor commanded state.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The output state of the AIR BAG indicator control circuit does not match the commanded state for 1.25 seconds.

Action Taken When the DTC Sets

The SDM attempts to turn the AIR BAG indicator ON.

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

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:

    • A short to voltage in the AIR BAG indicator control circuit
    • The instrument panel cluster (IPC) connector
    • An internal IPC malfunction
    • The SDM connector
    • An internal SDM malfunction

If an intermittent condition exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

  1. Tests to see if the IPC connector is damaged or corroded.

    2.

  2. Tests to see if the IPC terminals are damaged or corroded.

    3.

  3. Tests to see if the SDM connector is damaged or corroded.

    4.

  4. Tests to see if the SDM terminals are damaged or corroded.

    5.

  5. Tests to see if there is a short to voltage in the AIR BAG indicator control circuit.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

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. Disconnect the IPC connector. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Inspect the IPC connector for damage or corrosion that may cause a short to voltage.

Did you find and correct the condition?

Go to Step 8

Go to Step 3

3

Inspect the IPC terminals for damage or corrosion that may cause a short to voltage.

Did you find and correct the condition?

Go to Step 8

Go to Step 4

4

  1. Disconnect the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Inspect the SDM connector for damage or corrosion that may cause a short to voltage.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Inspect the SDM terminals for damage or corrosion that may cause a short to voltage.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

Test the AIR BAG indicator control circuit for a short to voltage.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the replacement?

Go to Step 8

--

8
  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