If the windshield wipers on your GMC Terrain have stopped working, it could be due to several potential issues. This guide will help you identify and address the problem effectively.

Common Causes of Windshield Wiper Failure

1. Blown Fuse or Faulty Relay

  • The first step is to check the fuses and relays in the fuse box under the hood.
  • Locate Fuse #29 (25A) for front wipers and Fuse #30 (20A) for rear wipers. Inspect them for damage.
  • Test the wiper speed relay by swapping it with another relay of the same type. Replace if necessary.

2. Wiper Motor Malfunction

  • If the fuses and relay are functional, the issue might be with the wiper motor.
  • A faulty motor can prevent the wipers from moving or operating at different speeds.

3. Corroded Ball Joints in Wiper Module

  • Certain GMC Terrain models (e.g., 2013, 2014, 2015) have been recalled due to corrosion in the ball joints of the wiper module.
  • Corrosion can cause wear, leading to one or both wipers becoming inoperative. Check if your vehicle is part of a recall.

4. Damaged Linkage Assembly

  • The linkage connecting the motor to the wiper arms may break or disconnect over time, rendering the wipers non-functional.

Step-by-Step Troubleshooting

Step 1: Inspect Fuses and Relays

  • Open the hood and locate the fuse box.
  • Check Fuse #29 and Fuse #30 for any signs of a blown fuse.
  • Test or replace the wiper speed relay if needed.

Step 2: Test Wiper Motor

  • Turn on the wipers and listen for motor noise. If silent, it may need replacement.
  • Consider consulting a mechanic if motor replacement is required.

Step 3: Examine Linkage Assembly

  • Open access to the wiper assembly under the hood.
  • Look for broken or disconnected parts in the linkage system.

Step 4: Check for Recall Issues

  • Use your vehicle’s VIN to check for open recalls related to windshield wipers on platforms like NHTSA’s website.
  • If your vehicle is affected, contact your dealer for a free repair.

Preventive Maintenance Tips

  • Regularly inspect and replace worn-out wiper blades.
  • Keep hinges and joints lubricated to prevent corrosion.
  • Avoid operating wipers on dry glass or heavy snow/ice to reduce stress on components.

FAQs About GMC Terrain Windshield Wipers

    • What should I do if my wipers stop mid-operation?
      Check if a fuse has blown or if there’s an issue with the relay. If these are fine, inspect the motor or linkage assembly.
    • Are there recalls for GMC Terrain windshield wipers?
      Yes, models from certain years (e.g., 2013–2015) have been recalled due to corroded ball joints in the wiper module.
    • How can I check if my vehicle is part of a recall?
      Use your VIN on NHTSA’s website or contact your dealership for confirmation.
    • Can I replace a faulty relay myself?
      Yes, relays are easy to swap out. Ensure you use one with matching specifications.

By following these steps, you can diagnose and potentially fix your GMC Terrain’s windshield wiper issue efficiently. For complex repairs like motor replacement, professional assistance may be necessary.