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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1529 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> Air Bag Indicator Circuit Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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. 5:  This step tests to see if the scan tool can communicate with the IPC.
  2. 6:  This step tests to see if the Ignition 1 voltage is more than 9 V.
  3. 7:  This step tests to see if the Ignition 1 voltage is more than 16 V.
  4. 8:  This step tests to see if the SDM connector is damaged or corroded.
  5. 9:  This step tests for an open or high resistance in the Ignition 1 voltage feed circuit to the SDM.
  6. 10:  This step tests for an open or high resistance in the Ignition 1 voltage feed circuit to the AIR BAG Fuse.
  7. 11:  This step tests for an open or high resistance in the SDM ground circuit.
Air Bag Indicator Circuit Malfunction

Step Action Value 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. Turn OFF the ignition.
  2. Note the AIR BAG indicator while turning the ignition ON.
Does the AIR BAG indicator flash seven times?		 - Go to Step 4  Go to Step 3 
3 Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gauges and Console.
Did you complete the replacement?		 - Go to Step 13  -
4 Note the AIR BAG indicator after it has flashed seven times.
Does the AIR BAG indicator turn OFF after flashing seven times?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 5 
5 
  1. Install a scan tool.
  2. Attempt to communicate with the IPC.
Does the scan tool communicate with the IPC?		 - Go to Step 6  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
6  With a scan tool, observe the SIR data list display.
Does the scan tool indicate that the ignition voltage is greater than the specified value?		 9 V Go to Step 7  Go to Step 8 
7  Does the scan tool indicate that the ignition voltage is greater than the specified value? 16 V Go to Diagnostic System Check - Engine Electrical in Engine Electrical Go to Step 12 
8 
  1. Turn OFF the ignition.
  2. Disconnect the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  3. Inspect the SDM connector for damage or corrosion that may cause an open or high resistance. 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 9 
9 
  1. Remove the AIR BAG Fuse.
  2. Test the Ignition 1 voltage feed circuit to the SDM for an open or high resistance.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
10  Test the Ignition 1 voltage feed circuit to the AIR BAG Fuse for an open or high resistance.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
11 
  1. Turn OFF the ignition.
  2. Test the SDM ground circuit for an open or high resistance.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
12 Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
Did you complete the replacement?		 - Go to Step 13  -
13 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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