2017 Cadillac XT5 Heads Up Display: Diagnosing a Blank Screen and Replacement Guide

Symptoms of a Failing Heads Up Display

When the HUD assembly in a 2017 Cadillac XT5 begins to fail, the symptoms are usually very noticeable. Understanding these signs can help you determine if the problem is a simple software glitch or a true hardware failure.

• Blank or Inoperative Display: The most common symptom is the HUD failing to turn on or project an image onto the windshield. This can be an intermittent problem, with the display sometimes working after restarting the vehicle.
• Unresponsive Controls: The display may be stuck on, but you are unable to adjust the brightness, change the information displayed (page controls), or adjust the vertical position (aim).
• Settings Not Saved: The system may fail to remember your preferred height, brightness, or rotation settings between ignition cycles.
• Flickering or Dim Image: The projected image may flicker, appear unusually dim even at the highest brightness setting, or seem distorted.
• Diagnostic Trouble Code (DTC) U1518: If you scan the vehicle with an OBD-II tool, you may find DTC U1518 stored in the instrument cluster module, which indicates a loss of communication with the HUD.

Known Issues, TSBs, and Recalls

While there are no specific recalls for the HUD assembly on the 2017 Cadillac XT5, General Motors has issued Technical Service Bulletins (TSBs) that address the most common failures.

TSB 21-NA-127: Blank or Unresponsive HUD

This is the most important TSB for this issue. It addresses a condition where the HUD goes blank or stops responding to controls, often setting DTC U1518.

• Cause: GM identified the cause as a timing issue with data messages on the vehicle's internal network (the LIN bus). This can cause the HUD module to get stuck in a standby mode.
• The Fix: Before assuming the HUD has failed, GM recommends a simple power cycle. With the ignition off, locate and remove the fuse for the HUD in the instrument panel fuse block 🎬 Watch this video to locate your XT5 fuse box for at least 30 seconds. Reinstall the fuse and check for operation. If this works, it confirms the software glitch. A more permanent solution is to have a dealer reprogram the Instrument Panel Cluster (IPC) with updated software that corrects the timing issue.

TSB 19-NA-010: Crooked or Tilted Display

Some owners report that the HUD image appears tilted or crooked on the windshield. This is almost never a hardware fault. The HUD system has a rotation adjustment feature in the vehicle's settings menu. This TSB instructs 🎬 Watch this guide on how Cadillac's HUD controls and settings work technicians not to replace the HUD for this concern, but to simply guide the owner on how to adjust the rotation.

Buying a Used 2017 Cadillac XT5 Heads Up Display Assembly

Since new aftermarket units are not available for this complex part, a used OEM assembly is a cost-effective option. However, careful inspection and verification are critical to ensure you get a good part.

• Verify Your Option: First and foremost, confirm your XT5 was built with the HUD option. Check for the RPO code UV6 on the Service Parts Identification label, which is typically found in the glove box or trunk area. If your vehicle does not have this code, it is not wired for a HUD, and adding one is not a simple plug-and-play process.
• Check the Part Number: The most current part number is 85595016. This part supersedes many older versions. While an older number might work, purchasing the latest version ensures you have the most up-to-date hardware revisions.
• Physical Inspection: When you receive the used part, inspect it carefully. Check the projector lens for deep scratches, chips, or cloudiness that could distort the final image. Ensure the plastic housing is not cracked or broken, especially around the mounting points. Look at the electrical connector pins to make sure they are straight and free of corrosion.
• Ask About the Source Vehicle: If possible, find out the mileage of the vehicle the part came from. A lower-mileage part is generally preferable. Also, confirm the part was not removed from a vehicle with flood or fire damage, which can cause hidden electronic issues later on.

Replacement Overview & Difficulty

Replacing the Heads Up Display assembly is a complex and time-consuming job that requires extensive disassembly of the dashboard. It is not recommended for beginners.

• Difficulty Rating: 5 out of 5
• Process: The HUD unit is located deep within the dashboard, underneath the speaker grille near the windshield. Accessing it requires removing the instrument panel top pad, A-pillar trims, the center speaker grille, and potentially the instrument cluster itself.
• Tools Required: You will need a good set of interior trim removal tools, a 7mm socket, 🎬 See how to tear down the XT5 dash panel and patience.
• Professional Installation: Due to the high risk of damaging delicate dashboard components, most owners should budget for professional installation.

Programming & Calibration

A replacement HUD may require programming or calibration to work correctly. After installation, the vehicle may need to be connected to a dealer-level scan tool to calibrate the projector's position and ensure it communicates properly with the instrument cluster and other modules. This is not a step that can be skipped if the display is misaligned or not functioning after installation.

Cost Comparison

The cost to fix a faulty HUD can vary significantly depending on whether you need a simple software update or a full hardware replacement.

Frequently Asked Questions (FAQ)