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Home / DTC / U1715 — Loss of Front Door Module to Window Motor High Speed Comm.

U1715 — Loss of Front Door Module to Window Motor High Speed Comm.

Detailed page for trouble code U1715.

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23,694specific
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Code

U1715

HUMMER U — Network/User

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

Brand: HUMMER
Type: U — Network/User
AI status
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Page language: EN

Causes

  • Open, short, or high resistance in wiring between Front Door Module and window motor
  • Corroded, loose or damaged connector at door module or motor
  • Failed window motor or internal motor wiring
  • Failed or intermittently functioning Front Door Module (FDM)
  • Blown fuse or faulty power/ground feeding the motor or FDM
  • Water intrusion or mechanical damage in door harness (pinch points, hinge area)

Symptoms

  • Front power window(s) do not operate at high speed or do not run at all
  • Loss of auto up/down function on affected door
  • DTC U1715 stored and possibly other related communication codes
  • Intermittent operation or only low‑speed movement of the window
  • Possible clicking sounds from relay or module when command given

What to check

  • Retrieve all stored DTCs and freeze frame data with a capable scan tool; note related codes
  • Operate the window while monitoring live data/commands for the FDM and window motor
  • Visually inspect door harness, grommet/boot between door and body for damage or corrosion
  • Inspect connectors at the door module and window motor for corrosion, bent pins, or moisture
  • Verify fuses and power/ground availability to FDM and window motor with a DVOM
  • Perform a wiggle test on the harness while operating the window to check for intermittent faults

Signal parameters

  • Motor supply voltage: battery voltage (~11–14 V) present at motor connector when commanded
  • Command signal type: switched battery or PWM drive from FDM (vehicle‑specific); expect a pulsed or switched voltage when commanding motor
  • Typical PWM frequency range for motor drivers: tens to a few hundred Hz (manufacturer specific)
  • Motor coil resistance (approximate): low single‑digit ohms when measured at motor (varies by motor)
  • Motor current: small steady current when free running; high current when stalled or mechanically bound (check with clamp meter)

Diagnostic algorithm

  1. Verify the symptom: Attempt window operation and reproduce the fault while monitoring scan tool messages and live data.
  2. Record all DTCs and freeze frame; clear codes and attempt to re‑set to see if fault is intermittent.
  3. Inspect connectors and wiring boot between door and body; repair any physical damage or corrosion.
  4. With connector disconnected, check continuity and resistance between FDM pins and motor pins for open/shorts. Repair any wiring faults.
  5. Reconnect and measure voltage at motor connector while commanding high‑speed operation. No voltage indicates supply/driver or module fault.
  6. Measure motor current while commanding operation. Excessive current indicates a seized/dragging motor; replace motor if necessary.
  7. If wiring, power and motor check good, use a scope or data logger to capture the command waveform (PWM or switched battery) from the FDM to the motor to confirm proper drive signal.
  8. Check module grounds and battery feed circuits; repair as needed.
  9. If communication bus is suspected, monitor network traffic and verify other modules are communicating. Repair bus faults (terminations, shorts) first.
  10. If all wiring, power, ground and motor are OK, consider replacing or reprogramming the Front Door Module per factory procedures. Recheck for codes after replacement.

Likely causes

  • Damaged/loose connector at motor or FDM (common in door harness)
  • Broken or chafed wire in the door hinge/boot area
  • Window motor failing (open/short or excessive current when commanded)
  • Missing battery feed or poor ground at motor or module

Fault status

⚠️ Status
Loss of high‑speed command/communication between Front Door Module and front window motor. May be intermittent or permanent; affects high‑speed/window auto functions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0251
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