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Home / DTC / U1714 — Loss of Front Door Module to Window Motor Normal Speed Comm.

U1714 — Loss of Front Door Module to Window Motor Normal Speed Comm.

Detailed page for trouble code U1714.

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Code

U1714

HUMMER U — Network/User

Loss of Front Door Module to Window Motor Normal Speed Comm.

Brand: HUMMER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between Front Door Module and window motor/regulator
  • Corroded or loose connector at the window motor or door module
  • Failed window motor or internal motor driver/regulator
  • Faulty Front Door Module (control module) or software fault
  • Blown fuse or poor power/ground to motor or module
  • Intermittent communication bus fault (CAN/LIN/body network) or interference

Symptoms

  • Front window operates only slowly or not at normal speed
  • Window moves intermittently, stalls, or is inoperative
  • One-touch or auto-up/down function may not work
  • Related door/module communication errors present in scan tool
  • Possible blown fuse or tripped current protection for the window circuit

What to check

  • Read and record all stored and pending DTCs with an OEM-capable scan tool
  • Check battery voltage and inspect fuses and fusible links for the door/window circuits
  • Visual inspection of door wiring harness, connectors and chafe points (especially at door hinge)
  • Wiggle-test wiring/connectors while commanding the window to identify intermittent faults
  • Measure power and ground at the window motor connector with key on and while operating
  • Monitor module communication (CAN/LIN/body network) with a scan tool while operating the window

Signal parameters

  • Battery supply at motor: ~12 V (key on/engine off), should remain near battery during operation
  • Window motor current draw: increased when motor is under load; large sustained overcurrent indicates mechanical binding or motor fault
  • Motor winding resistance: typically low (check service manual for spec; often ~1–5 ohms)
  • Control signal: PWM speed control or switched power from FDM — verify presence while commanding window
  • Network bus: CAN/LIN frames related to door/window commands present when commanding the window (CAN wires nominal ~2.5 V idle each)

Diagnostic algorithm

  1. Retrieve and document all DTCs and freeze frame data. Note whether U1714 is current or intermittent.
  2. Verify battery voltage and inspect/replace any blown fuses related to door/window circuits.
  3. Perform visual inspection of the door wiring harness, connectors at the door, hinge area and window motor connector; repair any damage or corrosion.
  4. With a scan tool, command the window up/down and observe module status and any communication messages; note if the command is sent from FDM and whether a response is present.
  5. Probe the motor connector: check for battery voltage, ground, and control signal while commanding the window. If no control signal, suspect FDM or communication fault.
  6. Wiggle the harness/connectors while operating the window to detect intermittent opens/shorts. Repair any intermittent wiring or connector faults.
  7. If power/ground and control signal are present but the motor does not respond or runs poorly, disconnect motor and bench-test motor for correct operation and current draw. Replace motor/regulator if failed.
  8. If motor and wiring are good, perform module-level checks: check FDM power/ground, reflash/update module software per TSBs, and consider module replacement if confirmed faulty.
  9. After repairs, clear DTCs and retest multiple cycles to confirm successful repair and no recurrence.

Likely causes

  • Damaged connector or pin corrosion at the door harness or motor
  • Broken/shorted wiring in the door harness where it flexes
  • Window motor failed (internal comms or speed control) or excessive mechanical load
  • Poor ground or low battery voltage to the FDM or motor
  • Front Door Module fault or corrupted module software

Fault status

⚠️ Status
Lost/failed normal-speed communication between Front Door Module and front window motor; window may operate improperly or not at normal speed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0140 U0121 U1000 U0101
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