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Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the ECM and the TCM one at a time. After each disconnect, test for current DTCs. DTC U1814 should remain current.
    • If the DTC becomes history, replace the module disconnected when the DTC became history.
  2. Ignition OFF, disconnect the X4 harness connector at the BCM.
  3. Test for infinite resistance between the signal circuit terminal 19 and ground.
    • If less than the specified value, test the signal circuit for a short to ground.
  4. If all circuits tests normal, replace the BCM.
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