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Home >> Cadillac >> 2023 >> CT5 V Blackwing, Automatic Trans >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belts >> Diagnostic Information and Procedures >> DTC B1920 >> Circuit/System Testing

Circuit/System Testing

NOTE:
  1. Ignition/Vehicle OFF, disconnect the harness connector at the appropriate B153RM Rear Center 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 1 and ground.
    • If 5 Ω or greater 
    1. Ignition/Vehicle OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    4. 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/Vehicle ON.
  4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.
    • If not Buckled 
    1. Ignition/Vehicle OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    4. 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.
    • Go to next step: 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. Ignition/Vehicle OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, Ignition/Vehicle ON.
    4. 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
    5. 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 B153RM Rear Center Seat Belt Buckle.
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