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Home >> Buick >> 2018 >> Regal Base >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belt System >> Diagnostic Information and Procedures >> DTC B0075-B0077 >> 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.

  • B88RR Seat Belt Switch-Right Rear
  • B88A Seat Belt Switch-Rear Middle Left
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  1. Ignition 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 2 and ground.
    • If 5 Ω or greater 
    1. Ignition 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.
    • Go to next step: If less than 5 Ω 
  3. Ignition ON.
  4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.
    • If not Buckled 
    1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the signal circuit terminal 1 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.
    • Go to next step: If Buckled 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.
    • If not Unbuckled 
    1. Ignition OFF, disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module, ignition 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.
      • Go to next step: 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.
    • Go to next step: If Unbuckled 
  7. Test or replace the B88 Seat Belt Switch.
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