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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 146 (Seat Belts) >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Passenger >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Refer to: SIR Service Precautions
  • Refer to: SIR Disabling and Enabling .
  • Inspect the terminals of the following components and connectors for damage or corrosion and repair or replace as necessary:
    • A103 Roof Console
    • B153 Seat Belt Buckle
    • K36 Restraints Control Module
    • Inline Harness Connector
  • The connector position assurance (CPA) should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
  1. Ignition OFF, disconnect the harness connector at the appropriate 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 1 and ground.
    • If 5 Ω or greater 
    1. Ignition 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 ON.
  4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.
    • If not Buckled 
    1. Ignition 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 OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition 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 B153P Front Seat Belt buckle - Passenger.
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