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Home › Chevrolet › 2012 › Volt › Repair and Diagnosis › Restraints › Restraints Control Systems › Seat Belt System › Diagnostic Information and Procedures › DTC B0072 or B0073 › Circuit/System Testing

Circuit/System Testing

NOTE:

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

  • B88D Seat Belt Switch-Driver
  • B88P Seat Belt Switch-Passenger
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  1. Vehicle OFF, disconnect the harness connector at the appropriate B88 Seat Belt Switch.
  2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
    • If 5 Ω or greater 
    1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for less than 2 Ω in the low reference 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. Vehicle ON.
  4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.
    • If not Buckled 
    1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If Buckled 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
  6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.
    • If not Unbuckled 
    1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, Vehicle ON.
    2. 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.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal 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 Unbuckled 
  7. Test or replace the B88 Seat Belt Switch.
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