GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2005 🢒 L300/LW300 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Air Bag Indicator Circuit Malfunction

Circuit Description

The ignition switch supplies ignition voltage to the inflatable restraint sensing and diagnostic module (SDM) using the SIR Fuse. The ignition switch also supplies ignition 1 voltage to the instrument panel cluster (IPC). The AIR BAG warning indicator is controlled by the SDM via class 2 serial data. When the ignition switch is first turned ON, the SDM responds by performing tests on the SIR system and then commanding the AIR BAG warning indicator OFF after it has flashed 7 times if no trouble codes (DTCs) are found.

Diagnostic Aids

If battery voltage is outside of the normal operating voltage range, 9-16 volts, the AIR BAG warning indicator will come ON solid with no DTCs set.

Step

Action

Values

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Using a scan tool, establish communication with the inflatable restraint sensing and diagnostic module (SDM).
  2. Use the scan tool to request the SIR data list display.
  3. With a scan tool, observe the Ignition Voltage parameter in the SIR data list.

Does the scan tool indicate that the ignition voltage is within the specified range?

9-16 V

Go to Step 3

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

3
  1. Using the scan tool, pull up Special Functions in instrument panel cluster (IPC).
  2. Go to Lamp and Gauge Check for Instrument Cluster.
  3. In the Lamp and Gauge test mode you can turn ON or OFF the instrument panel indicators.
  4. All indicators will turn ON when commanded on.

Does scan tool command the AIR BAG Warning Indicator ON then OFF?

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Go to Step 4

Go to Step 5

4

Replace the SDM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

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Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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5

The AIR BAG warning indicator is not serviceable separately. The IPC must be serviced as a complete unit. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

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Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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