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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1417 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0077, B0078, B0079, B0080, B0081, or B0082: Side Impact Sensor (SIS) Circuit >> Test Description

Test Description

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

  1. 2:  Tests the communication status of the SIS.
  2. 6:  Tests for a short to ground, a high resistance, or an open in the SIS signal circuit.
  3. 7:  Tests for a short to ground, a high resistance, or an open in the SIS voltage circuit.
  4. 8:  Tests for a short to voltage in the SIS signal and voltage circuits.
DTC B0077, B0078, B0079, B0080, B0081, or B0082

Step Action 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 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, request the SIR DTC display.
Does the scan tool indicate that either DTC B0079, B0080, B0081, or B0082 is current?		 Go to Step 12  Go to Step 3 
3
  1. Turn OFF the ignition.
  2. If DTC B0077 is current, disconnect the left SIS connector. If DTC B0078 is current, disconnect the right SIS connector. Refer to Inflatable Restraint Side Impact Sensor Replacement  .
  3. Inspect both the SIS and harness connector terminals for damage or corrosion.
Does the SIS terminals or harness connector exhibit any signs of damage or corrosion?		 Go to Step 4  Go to Step 5 
4
  1. If the SIS terminals are damaged, replace the SIS. Refer to Inflatable Restraint Side Impact Sensor Replacement  .
  2. If the SIS harness connector is damaged, replace the connector. Refer to Connector Repairs in Wiring Systems.
Did you complete the replacement?		 Go to Step 13  -
5
  1. Disconnect the SDM connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement  .
  2. 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 6 
6 
  1. If DTC B0077 is current, test the left SIS signal circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. If DTC B0078 is current, test the right SIS signal circuit for a short to ground, a high resistance, or an open. 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 
  1. If DTC B0077 is current, test the left SIS voltage circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. If DTC B0078 is current, test the right SIS voltage circuit for a short to ground, a high resistance, or an open. 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 
  1. Turn ON the ignition, with the engine OFF.
  2. If DTC B0077 is current, test the left SIS signal and voltage circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  3. If DTC B0078 is current, test the right SIS signal and voltage circuits for a short to voltage. 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 For DTC B0077 replace the left SIS. For DTC B0078 replace the right SIS. Refer to Inflatable Restraint Side Impact Sensor Replacement  .
Did you complete the replacement?		 Go to Step 10  -
10
  1. Reconnect all SIR system 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 11  System OK
11 Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement  .
Did you complete the replacement?		 Go to Step 13  -
12 For DTCs B0079 and B0080 replace the left SIS. For DTCs B0081 and B0082 replace the right SIS. Refer to Inflatable Restraint Side Impact Sensor Replacement  .
Did you complete the replacement?		 Go to Step 13  -
13
  1. Reconnect all SIR system components.
  2. Verify that all components, connectors and CPAs are properly mounted.
  3. Use the scan tool in order to clear the DTCs.
  4. 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
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