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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors X3 and X4 from the BCM.
  2. Ignition OFF, test for less than 1.0 ohm between the ground circuits X3 terminal 1, X3 terminal 5, and X4 terminal 9 and ground.
    • If not within the specified range, repair the ground circuit.
  3. Ignition On, measure voltage on the B+ circuits X3 terminal 3 and X4 terminal 10. The voltage on the B+ circuits should not differ by more than 2 volts.
    • If not within the specified range, test the circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the BCM.
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