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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Rendezvous - FWD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic 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 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

Value(s)

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

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

3
  1. Using the scan tool, pull up Special Functions in Instrument Panel Cluster.
  2. Go to Displays Test for Instrument Cluster in Output Control.
  3. In the Display 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 for replacement, setup, and programming.

Did you complete the replacement?

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Go to Diagnostic System Check - Vehicle

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5

The AIR BAG warning indicator is not serviceable separately. The instrument panel cluster (IPC) must be serviced as a complete unit. Refer to Control Module References for replacement, setup, and programming.

Did you complete the repair?

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Go to Diagnostic System Check - Vehicle

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