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Home >> Chevrolet >> 2012 >> Camaro LS, Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Ignition Switch/Steering Lock >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B1370-B1379, B1380-B1389, or B1440-B1443 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, disconnect the harness connector at the S39 ignition switch while the ignition is ON.
  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. Ignition OFF.
    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. Ignition OFF.
    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:
      • If infinite resistance
      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 - S39 ignition switch
      • Ignition circuit terminal 1 - S39 ignition switch
      • Ignition circuit terminal 3 - S39 ignition switch
      • Ignition circuit terminal 4 - S39 ignition switch
      • Ignition circuit terminal 6 - S39 ignition switch
    • If the test lamp illuminates 
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 body control module.
    2. 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
    3. 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. Ignition OFF, disconnect the X3 harness connector at the K9 body control module.
    2. 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 
  5. Connect the harness connector at the S39 ignition switch.
  6. Ignition OFF, disconnect the X3 harness connector at the K9 body control module, ignition ON.
  7. Verify a test lamp illuminates between each of the ignition circuits listed below and ground:
    • Ignition circuit terminal 5 - K9 body control module
    • Ignition circuit terminal 6 - K9 body control module
    • Ignition circuit terminal 15 - K9 body control module
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    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 OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    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 
  8. Test or replace the S39 ignition switch.
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