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Circuit/System Testing

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IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Connect a test lamp between each fuse test terminal of the ignition switch B+ circuit fuse and ground. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the circuits listed below for a short to ground. If all circuits test OK, replace the BCM.
      • B+ terminal 4
      • Ignition terminal 3
      • Ignition terminal 5
      • Ignition terminal 2
      • Ignition voltage terminal BCM terminal 21, X4
  2. Disconnect the harness connector at the ignition switch.
  3. Connect a test lamp between the B+ circuit terminal 4 and ground. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
    4. IMPORTANT: The ignition switch component test must be performed before proceeding with this test to verify the integrity of the switch.
  4. Perform the ignition switch component test. Verify the switch passes the test.
    • If the ignition switch does not test normal, replace the ignition switch.
  5. Disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the BCM and ground.
    • Ignition terminal 4
    • Ignition terminal 2
    • Ignition terminal 21
    • Ignition terminal 14
    • If greater than specified, test the circuit for a short to voltage.
  6. Test for less than 1.0 ohm between the BCM and the ignition switch on the circuits listed below:
    • Ignition terminal 4, X1 and ignition switch terminal 6
    • Ignition terminal 2, X1 and ignition switch terminal 5
    • Ignition terminal 21, X1 and ignition switch terminal 3
    • Ignition terminal 14, X1 and ignition switch terminal 2
    • If greater than specified, test the circuit for open/high resistance
  7. If all circuits test normal, replace the BCM.
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