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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. 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. Ignition OFF, disconnect the ignition switch connector.
    2. IMPORTANT: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
  2. Perform the ignition switch component test. The test should pass.
    • If the ignition switch fails, replace the ignition switch.
  3. Ignition OFF, disconnect harness connector X1 of the BCM.
  4. Ignition ON, test for less than 1.0 volt between the BCM circuits listed below and ground:
    • 12 volt reference terminal 25
    • Crank voltage terminal 21
    • Ignition 1 voltage terminal 22
    • Ignition 3 voltage terminal 23
    • If greater than the specified range, test the circuit for a short to voltage.
  5. Remove the IGN 1 Relay.
  6. Test for infinite resistance between the BCM circuits listed below and ground:
    • 12-volt reference, terminal 25
    • Crank voltage, terminal 21
    • Ignition 1, voltage, terminal 22
    • Ignition 3 voltage, terminal 23
    • Ignition 1 voltage, terminal 3
    • If less than the specified value, test the circuit for a short to ground.
  7. Test for less than 1.0 ohm of resistance between the BCM and ignition switch on the following circuits:
    • 12-volt reference, BCM terminal 25 and ignition switch terminal 4
    • 12-volt reference, BCM terminal 25 and ignition switch terminal 6
    • Crank voltage, BCM terminal 21 and ignition switch terminal 5
    • Ignition 1 voltage, BCM terminal 22 and ignition switch terminal 7
    • Ignition 3 voltage, BCM terminal 23 and ignition switch terminal 3
    • If greater than the specified range, test the circuit for open/high resistance
  8. If all circuits test normal, replace the BCM.
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