Circuit/System Testing
- Ignition OFF, disconnect the harness connectors X3 and X4 from the BCM.
- 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.
- 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.
- If all circuits test normal, replace the BCM.