LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belts >> Diagnostic Information and Procedures >> DTC B1A32 >> Circuit/System Testing

Circuit/System Testing

NOTE:
  • The condition may be intermittent and require driving the vehicle, then reviewing the snapshot to verify resistance parameters do not drop out or spike. Refer to Testing for Intermittent Conditions and Poor Connections
  • Refer to SIR Service Precautions .
  • Refer to SIR Disabling and Enabling .
  • Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
    • P16 Instrument Panel Cluster Control Module
    • K36 Restraints Control Module
  • The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click.
  1. Ignition OFF, disconnect the harness connector at the P16 Instrument Panel Cluster Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Connect a test lamp between the control circuit terminal and ground, ignition ON.
  4. Verify the test lamp is OFF when commanding the Passenger Seat Belt Reminder Indicator OFF with a scan tool.
    • If the test lamp is ON 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Restraints Control Module, ignition ON.
    4. Test for less than 1 V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K36 Restraints Control Module.
    • Go to next step: If test lamp is OFF 
  5. Verify the test lamp is ON when commanding the Passenger Seat Belt Reminder Indicator ON with a scan tool.
    • If the test lamp is OFF 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Restraints Control Module.
    4. Test for infinite resistance between the control circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    5. Test for less than 2 Ω in the 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 Restraints Control Module.
    • Go to next step: If test lamp is ON 
  6. Test or replace the P16 Instrument Panel Cluster Control Module.
  7. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K36 Restraints Control Module.

    • Go to next step: If the DTC does not set 
  8. All OK.
scientia non olet · About LEMON Manuals