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Home >> Buick >> 2016 >> Encore Base, AWD >> Repair and Diagnosis (Single Page) >> Electrical >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B1370: Control Module Ignition On and Start Circuit >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the KR73 Ignition Main Relay.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 

      Test the ground circuit for an open/high resistance.

    • If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate 

      Repair the open/high resistance in the circuit.

    • If the test lamp illuminates 
  4. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.
    • If the test lamp illuminates 
    1. Disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
      • If the test lamp does not illuminate 
  5. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground.
    • If the test lamp does not illuminate 
    1. Test for less than 2 Ω in the control circuit end to end.
      • If less than 2 Ω, replace the K9 Body Control Module.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If the test lamp illuminates 
  6. Ignition OFF, reconnect the KR73 Ignition Main Relay.
  7. Disconnect the harness connector at the P16 Instrument Cluster.
  8. Verify that a test lamp does not illuminate between the ignition circuit terminal 31 and ground.
    • If the test lamp illuminates 
    1. Test for less than 1 V between the ignition circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the KR73 Ignition Main Relay.
    • If the test lamp does not illuminate 
  9. Ignition ON, verify that a test lamp illuminates between the ignition terminal 31 and ground.
    • If the test lamp does not illuminate and the Ignition fuse is good 
    1. 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, replace the KR73 Ignition Main Relay.
    • If the test lamp does not illuminate and the Ignition fuse is open 
    1. 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.
    • If the test lamp illuminates 
  10. Replace the P16 instrument cluster.
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