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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Retest for current DTCs. DTC U2099 should remain current.
    • If the DTC becomes history, replace the EBCM.
  3. Ignition OFF, disconnect the X 3 harness connector at the BCM.
  4. Test for infinite resistance between the serial data communication enable circuit terminal 19 and ground.
    • If less than infinite resistance, repair the enable circuit for a short to ground.
  5. If all circuits tests normal, replace the BCM.
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