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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, disconnect the BCM connector.
  2. With the ignition OFF w/key out and in the ACC positions, measure for 0 volts between the off/run/crank voltage circuit at the BCM connector and ground.
    • If over 0 volts, disconnect the ignition switch and check the off/run/crank voltage circuit for short to voltage or short to other ignition switch signal circuit.
  3. With the ignition OFF w/key in, measure for battery voltage between the off/run/crank voltage circuit at the BCM connector and ground.
    • If less than battery voltage, disconnect the ignition switch and check the off/run/crank voltage circuit for an open or short to ground.
  4. With the ignition in the RUN and START positions, measure for battery voltage between the ignition 1 voltage circuit at the BCM connector and ground.
    • If less than battery voltage, disconnect the ignition switch and check the ignition 1 voltage and battery positive voltage circuits for an open or short to ground.
  5. With the ignition in the ACC and RUN positions, measure for battery voltage between the accessory voltage circuit at the BCM connector and ground.
    • If less than battery voltage, disconnect the ignition switch and check the ignition voltage and battery positive voltage circuits for an open or short to ground.
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