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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 B1153: Seat Position Sensor 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. If DTC B1153 is retrieved as a current DTC, go to next step. If DTC B1153 is not retrieved as a current DTC, go to DIAGNOSTIC AIDS .
  3. Turn ignition off. Disconnect SPS connector. If either side of SPS connector is damaged, shows signs of corrosion or poor connections, go to next step.
  4. If SPS side of connector is damaged, replace SPS. Go to step  10. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step  10.
  5. Disconnect SDM connector. See Figure. If SDM connector shows signs of corrosion, poor connections or other damage, replace SDM connector. See WIRE REPAIR . Go to step  10. If SDM connector is okay, go to next step.
    NOTE: Use Digital Multimeter (J-39200) and Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
  6. Test SPS high-side and low-side circuits 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  10. If condition is not found, go to next step.
  7. Replace SPS. Go to step  9.
  8. Reconnect all SIR components. Using scan tool, clear SIR DTC's. Road test vehicle, then retrieve DTC's. If DTC is retrieved, go to next step. If DTC is not retrieved, system is normal.
  9. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to next step.
  10. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step  2. If DTC's are not retrieved, system is normal.
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