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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information And Procedures >> DTC B1370: Control Module Ignition On And Start Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
  2. Verify that a test lamp does not illuminate between the ignition circuit terminal 8 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • Go to next step: If the test lamp does not illuminate 
  3. Ignition ON.
  4. Verify that a test lamp illuminates between the ignition terminal 8 and ground.
    • If the test lamp does not illuminate and the Ignition fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the Ignition fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the P16 Instrument Cluster.
    • Go to next step: If the test lamp illuminates 
  5. Replace the P16 Instrument Cluster.
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