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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Seat Belt System) >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Rear >> Circuit/System Testing

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.

  • B88 Seat belt switch
  • Seat belt switch harness connector
  • K36 SDM
  • SDM wiring harness connector
  1. Ignition OFF.
  2. Disconnect the harness connector at the B88 seat belt switch.
  3. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    • If 5 Ω or greater 
    1. Disconnect the harness connector at the K36 SDM.
    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 SDM.
    • Go to next step: If less than 5 Ω 
  4. Ignition ON.
  5. Verify the scan tool 2nd Row Seat Belt Status parameter displays Buckled.
    • If the scan tool 2nd Row Seat Belt Status parameter does not display Buckled 
    1. Disconnect the harness connector at the K36 SDM.
    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 SDM.
    • Go to next step: If the scan tool 2nd Row Seat Belt Status parameter does display Buckled 
  6. Install a 3 A fused jumper wire between the circuit terminal 1 and the ground circuit terminal 2.
  7. Verify the scan tool 2nd Row Seat Belt Status parameter displays Unbuckled.
    • If the scan tool 2nd Row Seat Belt Status parameter does not display Unbuckled 
    1. Disconnect the harness connector at the K36 SDM.
    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.
    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 SDM.
    • Go to next step: If the scan tool 2nd Row Seat Belt Status parameter does display Unbuckled 
  8. Replace the B88 seat belt switch.
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