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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Seat Belt System) >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Passenger >> Circuit/System Testing >> Seat Belt Switch Malfunction

Seat Belt Switch Malfunction

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B153 Seat Belt Buckle - Passenger. It may take up to 2 min for all vehicle systems to power down.
    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
    • Seat belt switch harness connector
    • K36 Inflatable Restraint Sensing and Diagnostic Module
    • Inflatable Restraint Sensing and Diagnostic Module harness connector
  2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
    • If 5 Ω or greater 
    1. Disconnect the 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.
      • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Passenger Seat Belt Status parameter is Buckled.
    • If the scan tool Passenger Seat Belt Status parameter does not display Buckled 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. 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 less infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • 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 2 and the ground circuit terminal 1.
  6. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled.
    • If the scan tool Passenger Seat Belt Status parameter is not Unbuckled 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Ignition ON.
    3. 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.
      • If less than 1 V
    4. 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.
    • If the scan tool Passenger Seat Belt Status parameter does display Unbuckled 
  7. Ignition OFF, connect all harness connectors. Ignition ON.
  8. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.
    • If the Passenger Seat Belt Status parameter is not Buckled and Unbuckled 

      Test or replace the B153 Seat Belt Buckle - Passenger.

    • If the Passenger Seat Belt Status parameter does display Buckled and Unbuckled 
  9. All OK.
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