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Home >> Chevrolet >> 2016 >> Spark LS, Standard Trans >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B1370-B1379, B1380-B1389, or B1440-B1443: Control Module Ignition ON and Start Circuit/Control Module Ignition Accessory Circuit/Control Module Ignition Off, Run, and Crank Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the S39 Ignition Switch.
  2. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on one of the following circuits listed below:
        NOTE:

        To help isolate a short to ground, it may be necessary to disconnect modules that are connected to the following circuits:

      • B+ circuit terminal 2
      • Ignition circuit terminal 1
      • Ignition circuit terminal 3
      • Ignition circuit terminal 4
    • If the test lamp illuminates 
  3. Connect the S39 Ignition Switch.
  4. Ignition ON, disconnect the harness connector at the S39 Ignition Switch while the ignition is ON.
  5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Connect the S39 Ignition Switch.
    2. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module and S39 Ignition Switch.
    3. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω in the 5 V 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 K9 Body Control Module.
    • If greater than 5.2 V 
    1. Connect the S39 Ignition Switch.
    2. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    3. Ignition ON, disconnect the harness connector at the S39 Ignition Switch while the ignition is ON.
    4. Test for less than 1 V between the 5 V reference 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 between 4.8-5.2 V 
  6. Connect the harness connector at the S39 Ignition Switch.
  7. Ignition OFF.
  8. Disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
  9. Verify a test lamp illuminates between each of the ignition circuits listed below and ground:
    • Ignition circuit terminal 5
    • Ignition circuit terminal 6
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S39 Ignition Switch.
    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, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit 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 K9 Body Control Module.
    • If the test lamp illuminates 
  10. Ignition OFF with the key in.
  11. Verify a test lamp illuminates between ignition circuit terminal 15 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF with the key out, 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, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF with the key out remove the test lamp.
    2. Test for infinite resistance between the ignition circuit terminal 15 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the test lamp illuminates 
  12. Connect the X3 harness connector at the K9 Body Control Module, ignition ON.
  13. Disconnect the harness connector at the S39 Ignition Switch.
  14. Test for less than 1 V between each of the ignition circuits listed below and ground.
    • Ignition circuit terminal 1
    • Ignition circuit terminal 3
    • Ignition circuit terminal 4
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  15. Test or replace the S39 Ignition Switch.
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