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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 324 (Seat Belt System) >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Rear >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B153 Seat Belt Buckle
  • B153 Seat Belt Buckle harness connector
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  • K36 Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
  1. Ignition OFF. Scan tool disconnected. Disconnect the harness connector at the B153 Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal B and ground.
    • If 5 Ω or greater 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool 2nd Row Seat Belt Status parameter displays Buckled.
    • If the scan tool 2nd Row Seat Belt Status parameter does not display Buckled 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the seat belt switch signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If the scan tool 2nd Row Seat Belt Status parameter does display Buckled 
  5. Install a 3 A fused jumper wire between the circuit terminal A and the ground circuit terminal B.
  6. Verify the scan tool 2nd Row Seat Belt Status parameter displays Unbuckled.
    • If the scan tool 2nd Row Seat Belt Status parameter does not display Unbuckled 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Ignition ON.
    3. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
    4. Test for less than 2 Ω in each circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If the scan tool 2nd Row Seat Belt Status parameter does display Unbuckled 
  7. Replace the B153 Seat Belt Buckle.
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