LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2018 >> Enclave Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U1814: Powertrain High Speed Communication Enable Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  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.
scientia non olet · About LEMON Manuals