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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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.

  • B153P Seat Belt Buckle - Passenger
  • B153P Seat Belt Buckle - Passenger harness connector
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  • K36 Inflatable Restraint Sensing and Diagnostic Module harness connector

Passenger Seat Belt Switch Malfunction

  1. Ignition OFF. Disconnect the harness connector at the B153P Seat Belt Buckle - Passenger.
  2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If 5 Ω or greater 
    1. Disconnect the X2 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.
      • Go to next step: If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Passenger Seat Belt Status parameter listed below is Buckled.
    • If the scan tool Passenger Seat Belt Status parameter does not display Buckled 
    1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 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.
    • Go to next step: If the scan tool Passenger Seat Belt Status parameter does display 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 scan tool Passenger Seat Belt Status parameter is Unbuckled.
    • If the scan tool Passenger Seat Belt Status parameter does not display Unbuckled 
    1. Ignition OFF. Disconnect the X2 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.
    3. 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.
    • Go to next step: If the scan tool Passenger Seat Belt Status parameter does display Unbuckled 
  7. Ignition OFF, reconnect all harness connectors. Ignition ON.
  8. With a scan tool, monitor the Passenger Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.
    • If the Passenger Seat Belt Status parameter does not display Buckled and Unbuckled 

      Test or replace the B153P Seat Belt Buckle - Passenger.

    • Go to next step: If the Passenger Seat Belt Status parameter does display Buckled and Unbuckled 
  9. All OK.

Passenger Seat Belt Indicator Malfunction

  1. Ignition OFF. Disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 10 Ω 
  3. Ignition ON. With a scan tool, command the Passenger Seat Belt Reminder Indicator OFF.
  4. Test for less than 11 V between the control circuit terminal 4 and ground.
    • If 11 V or greater 
    1. Ignition OFF. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
    2. Test for less than 1 V between the control circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If less than 11 V 
  5. With a scan tool, command the Passenger Seat Belt Reminder Indicator ON.
  6. Test for greater than 4 V between the control circuit terminal 4 and ground.
    • If 4 V or less 
    1. Ignition OFF. Disconnect the X 1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the control circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    3. Test for less than 2 Ω between the control circuit terminal 4 and ground.
      • 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 greater than 4 V 
  7. Ignition OFF, reconnect all harness connectors. Ignition ON.
  8. With a scan tool, Command the Passenger Seat Belt Reminder Indicator ON and OFF.
    • If the passenger seat belt reminder indicator does not turn ON and OFF as commanded 

      Replace the S48C Multifunction Switch 1 - Instrument Panel.

    • Go to next step: If the passenger seat belt reminder indicator turns ON and OFF as commanded 
  9. All OK.
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