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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 454 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Passenger Presence System (PPS) Indicator Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

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  1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .
  2. Turn ignition off. Disconnect PPS ECU connector. If PPS ECU connector shows signs of corrosion or damage, replace connector. See WIRE REPAIR . Go to step  10. If connector is okay, go to next step.
  3. Disconnect inside rear view mirror connector, located at rear of mirror assembly. If mirror connector shows signs of damage or corrosion, replace connector. See WIRE REPAIR . Go to step  10. If mirror connector is okay, go to next step.
    NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
  4. Turn ignition off. Inspect Yellow wire between mirror connector terminal No. 13 and SIR fuse for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 1139 and corrected, go to step  10. If a short to ground, an open or high resistance is not found, go to next step.
  5. Inspect Dark Green wire between mirror connector terminal No. 4 and PPS ECU connector terminal "M" for a short to ground, an open or high resistance. See Figure. If a short to ground, an open or high resistance is found in circuit 2308 and corrected, go to step  10. If a short to ground, an open or high resistance is not found, go to next step.
  6. Inspect Dark Blue wire between mirror connector terminal No. 3 and PPS ECU connector terminal "L" for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 2307 and corrected, go to step  10. If a short to ground, an open or high resistance is not found, go to next step.
  7. Turn ignition off. Connect a test light between ignition voltage circuit 1139 and PPS OFF air bag indicator circuit 2308. Ensure passenger seat is empty. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  9.
  8. Replace rear view mirror. See REAR VIEW MIRROR  under REMOVAL & INSTALLATION. Go to step  10.
  9. Replace PPS. See PASSENGER PRESENCE SYSTEM (PPS)  under REMOVAL & INSTALLATION. Go to next step.
  10. Reconnect all PPS and rear view mirror components. Ensure all components and connectors are connected properly. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE . If condition is not corrected, go to step  2. If condition is corrected, system is normal.
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