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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 980 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> Passenger Presence System Indicator Circuit Malfunction >> Test Description

Test Description

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

  1. 4:  Tests the ignition 1 voltage circuit between the inside rear view mirror and the underhood fuse block for a short to ground, a high resistance, or an open.
  2. 5:  Tests the passenger air bag OFF indicator control circuit for a short to ground, a high resistance, or an open.
  3. 6:  Tests the passenger air bag ON indicator control circuit for a short to ground, a high resistance, or an open.
  4. 7:  Tests the PPS module for proper operation.
Passenger Presence System Indicator Circuit Malfunction

Step Action Yes No
Schematic Reference: SIR Schematics 
Connector End View Reference: SIR Connector End Views  or Stationary Windows Connector End Views in Stationary Windows.
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. Disconnect the passenger presence system (PPS) module connector.
  3. Inspect the PPS module 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 10  Go to Step 3 
3
  1. Disconnect the inside rear view mirror connector located at the back of the mirror.
  2. Inspect the inside rear view mirror 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 10  Go to Step 4 
  1. Turn OFF the ignition.
  2. Test the ignition 1 voltage circuit between the inside rear view mirror and the underhood fuse block 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 10  Go to Step 5 
Test the passenger air bag OFF indicator control 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 10  Go to Step 6 
Test the passenger air bag ON indicator control 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 10  Go to Step 7 
  1. Turn OFF the ignition.
  2. Connect a test lamp between the ignition 1 voltage circuit and the passenger air bag OFF indicator control circuit at the inside rear view mirror connector terminals.
  3. Empty the front passenger seat.
  4. Turn On the ignition, with the engine OFF.
Does the test lamp illuminate?
Go to Step 8  Go to Step 9 
8
IMPORTANT: When replacing the inside rear view mirror, perform the Compass Calibration and Variance Procedure when the repair is complete.
Replace the rear view mirror. Refer to Rearview Mirror Replacement in Instrument Panel, Gages, and Console.Did you complete the replacement?
Go to Step 10  -
9
IMPORTANT: The PPS is a calibrated system. The PPS must be rezeroed after replacement.
Replace the PPS. Refer to Inflatable Restraint Passenger Presence System Replacement - Front .Did you complete the replacement?
Go to Step 10  -
10
  1. Reconnect all PPS and rear view mirror system components.
  2. Verify that all components, connectors, and CPAs are properly mounted.
  3. Use the scan tool in order to clear the SIR and PPS DTCs.
  4. Rezero the PPS. Refer to Passenger Presence System Rezeroing Procedure .
  5. Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 2