SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2025SUBURBAN LS, RWDREPAIR AND DIAGNOSISRESTRAINTSRESTRAINTS CONTROL SYSTEMSSEAT BELTSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1AD3CIRCUIT/SYSTEM TESTING
2025 Chevrolet Suburban LS, RWD

Circuit/System Testing

2025 Chevrolet Suburban LS, RWDSECTION Circuit/System Testing
NOTE:
  • 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.
    • B153P Front Seat Belt Buckle - Passenger
    • K36 Inflatable Restraint Sensing and Diagnostic 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/Vehicle 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/Vehicle OFF.
    2. Disable the SIR system. Refer to SIR Disabling and Enabling .
    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. Disable the SIR system. Refer to SIR Disabling and Enabling .
    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. Enable the SIR system. Refer to SIR Disabling and Enabling .
  7. Ignition/Vehicle ON.
  8. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.
    • If not Unbuckled 
    1. Ignition/Vehicle OFF.
    2. Disable the SIR system. Refer to SIR Disabling and Enabling .
    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 
  9. Test or replace the B153P Front Seat Belt buckle - Passenger.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.