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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 453 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> DTC B0127: Seat Belt Switch Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  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 driver seat belt buckle switch. If driver seat belt buckle switch side of connector is damaged, replace driver seat belt buckle switch. Go to step  9. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step  9.
    NOTE: Use Digital Multimeter (J-39200) and Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
  3. Measure resistance between driver seat belt buckle switch terminal and ground with seat belt unbuckled. If resistance is 1000-1600 ohms, go to next step. If resistance is not 1000-1600 ohms, go to step  7.
  4. Measure resistance between driver seat belt buckle switch terminal and ground with seat belt buckled. If resistance is 100-500 ohms, go to next step. If resistance is not 100-500 ohms, go to step  7.
  5. Disconnect SDM connector. If SDM connector shows signs of corrosion, damage or poor connections, replace SDM connector. See WIRE REPAIR . Go to step  9. If SDM connector is okay, go to next step.
  6. Inspect driver seat belt buckle switch circuit for an open or high resistance and a short to ground or voltage. See WIRE REPAIR . If condition is found and corrected, go to step  9. If condition is not found and corrected, go to step  8.
  7. Replace seat belt buckle assembly. Go to step  9.
  8. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to next step.
  9. Reconnect all SIR components. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step  2. If DTC is not retrieved, system is okay.
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