LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 794 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U1814 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, disconnect the harness connector at the ECM and TCM one at a time. After each disconnect, retest for current DTCs. DTC U1814 should remain current.
    • If the DTC becomes history, replace the module disconnected before the DTC became history.
  2. Ignition OFF, disconnect the harness connector at the BCM.
  3. Test for infinite resistance between the accessory wakeup serial data circuit and ground.
    • If less than infinite resistance, repair the serial data circuit for a short to ground.
  4. If all tests normal, replace the BCM.
scientia non olet · About LEMON Manuals