GMC Sierra T1XX (2019-Present) windshield wipers not working, how to fix

GMC Sierra T1XX (2019-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

3 min read

565 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix windshield wipers not working on GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shorts

Symptoms

•Windshield wipers do not operate when activated
•Wiper control lever does not produce any response
•No unusual noises or sounds when attempting to activate wipers
•Windshield washer fluid may not spray
•Wiper motor or relay may be hot to the touch after attempted use

Diagnostic Steps

1
Inspect the windshield wiper fuse in the fuse box for continuity
2
Use an OBD-II scanner to check for any diagnostic trouble codes related to the wiper system
3
Test the wiper motor by applying direct power from the battery
4
Check the wiper switch for proper operation using a multimeter
5
Inspect wiring and connectors for damage or corrosion
6
Verify the operation of the wiper relay by swapping it with a known good relay

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Wrench set
•Jumper wires

Parts Required

•Windshield wiper fuse (if blown)
•Wiper motor (if tested faulty)
•Wiper relay (if tested faulty)

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Diagnostic Steps

1
Inspect the windshield wiper fuse in the fuse box for continuity
2
Use an OBD-II scanner to check for any diagnostic trouble codes related to the wiper system
3
Test the wiper motor by applying direct power from the battery
4
Check the wiper switch for proper operation using a multimeter
5
Inspect wiring and connectors for damage or corrosion
6
Verify the operation of the wiper relay by swapping it with a known good relay

Solution

1. Preparation

Gather tools and parts: OBD-II scanner, multimeter, socket set, wrench set, replacement fuse, wiper motor (if needed), and a relay (if needed).
Ensure the vehicle is parked on a level surface, and the ignition is off.

2. Check and Replace the Fuse

Locate the fuse box under the dashboard or in the engine compartment.
Remove the cover and locate the windshield wiper fuse.
Inspect the fuse for continuity using a multimeter. If blown, replace with a fuse of the same amperage (usually 20A).
Reinstall the fuse box cover.

3. Test the Wiper Motor

Disconnect the wiper motor connector.
Using jumper wires, connect the motor directly to the battery (positive to the positive terminal, negative to the negative terminal).
If the motor operates, the issue may be with the switch or wiring; if it does not, the motor needs replacement.

4. Replace the Wiper Motor (if necessary)

Remove the wiper arms using a puller or by unscrewing the mounting nut.
Unbolt the motor from its mounting bracket (typically requires a socket set).
Disconnect the electrical connector from the motor.
Install the new motor by reversing the removal steps.
Torque the motor bolts to the manufacturer's specifications (usually around 10-15 lb-ft).

5. Replace the Wiper Relay (if necessary)

Locate the wiper relay in the fuse box.
Remove the relay by pulling it straight out from its socket.
Install the new relay by pushing it firmly into the socket.