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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 95 (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

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
    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 ignition switch circuits listed below for a short to ground. If all circuits test OK, replace the BCM.
      • B+ terminal 2
      • Ignition terminal 4
      • Ignition terminal 3
      • Ignition terminal 5
  2. Disconnect the harness connector at the ignition switch.
  3. Connect a test lamp between the B+ circuit terminal 2 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 X2 and X4 harness connectors at the BCM, test for less than 1.0 volt between the circuit terminals of the BCM listed below and ground:
    • Ignition terminal C8, X4
    • Ignition terminal D3, X4
    • Ignition terminal 56, X2
    • 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 C8, X4 and 4
    • Ignition terminal D3, X4 and 3
    • Ignition terminal 56, X2 and 5
    • If greater than specified, test the circuit for open/high resistance.
  7. If all circuits test normal, replace the BCM.
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