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Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with 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 5 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    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 OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    2. Test for infinite resistance between the signal 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.
    • Go to next step: If the test lamp illuminates 
  3. Verify the scan tool Key in Ignition Status parameter is Inactive.
    • If not Inactive 
    1. Disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for less than 1 V between the signal circuit terminal 3 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.
    • Go to next step: If Inactive 
  4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the B+ circuit terminal 5.
  5. Verify the scan tool Key in Ignition Status parameter is Active.
    • If not Active 
    1. Connect harness connector at Ignition Switch, Ignition OFF, disconnect harness connector at Ignition Switch.
    2. Disconnect the X3 harness connector at the K9 Body Control Module.
    3. Test for less than 2 Ω in the signal 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.
    • Go to next step: If Active 
  6. Test or replace the S39 Ignition Switch.
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