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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  This step determines if ignition 1 voltage to the SDM is more than 9 V.
  2. 5:  This step determines if ignition 1 voltage to the SDM is more than 16 V.
  3. 6:  Tests for an open or high resistance in the ignition 1 voltage circuit between the SDM and the SIR fuse.
  4. 7:  Tests for an open or high resistance in the ignition 1 voltage circuit that feeds the SIR fuse.
  5. 8:  Tests for an open or high resistance in the SDM ground circuit.
Air Bag Indicator Circuit Malfunction

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 - SIR? - Go to Step 2  Go to Diagnostic System Check - SIR 
2 Did you perform the Diagnostic System Check - Instrument Cluster? - Go to Step 3  Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gages, and Console
3
  1. Turn OFF the ignition.
  2. Observe the AIR BAG indicator while turning the ignition ON.
Does the AIR BAG indicator flash seven times?		 - Go to Step 4  Go to Step 10 
4 
  1. Turn OFF the ignition.
  2. Install a scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, request the ignition voltage parameter in the SIR data list.
Does the ignition voltage displayed measure more than the specified value?		 9 V Go to Step 5  Go to Step 6 
5  Does the ignition voltage displayed measure more than the specified value? 16 V Go to Diagnostic System Check - Engine Electrical in Engine Electrical Go to Step 9 
6 
  1. Turn OFF the ignition.
  2. Test the ignition 1 voltage circuit between the SDM and the fuse block for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 7 
7  Test the ignition 1 voltage circuit that feeds the SIR fuse for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 8 
8  Test the SDM ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 9 
9
  1. Turn OFF the ignition.
  2. Disconnect the SDM connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  3. Inspect the SDM connector for corrosion or damage. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
10
  1. Disconnect the IPC connector. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console.
  2. Inspect the IPC connector for corrosion or damage. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
11 Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console.
Did you complete the replacement?		 - Go to Step 13  -
13
  1. Reconnect all SIR and IPC system components.
  2. Verify that all components, connectors, and CPAs are properly mounted.
Have all SIR and IPC components been properly connected and mounted?		 - Go to Diagnostic System Check - SIR  -
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