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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.
  2. With the ignition OFF w/key out and in the ACC position, 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. If the circuits test normal, test or replace the ignition switch.
  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. If the circuits test normal, test or replace the ignition switch.
  4. With the key in the RUN position, measure for less than 1 ohm between the ignition key resistor signal and the off/run/crank voltage circuits.
    • If over 1 ohm, disconnect the ignition switch and check the ignition key resistor signal for an open. If the circuits test normal, test or replace the ignition switch.
  5. Check the ignition key resistor signal for a short to ground or a short to voltage. If the circuits test normal, test or replace the BCM.
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