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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  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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