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Diagnostic Aids

  1. The following conditions may result in intermittent operation of BCM with no DTC stored:
    • Any condition which results in interruption of power to BCM.
    • Out of range battery or ignition voltage (normal BCM operating voltage is 9-16 volts).
    • Loose or damaged ground(s).
    • Open or shorted serial data line.
  2. BCM tests for different malfunctions during different vehicle conditions. A thorough test drive may be necessary to repeat malfunction. Most intermittent problems are caused by faulty electrical connections or wiring. Check for: poor connections, backed-out terminals, dirty or corroded terminals, chafed wires, or damaged connectors.
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