my GMC Sierra T1XX (2019-Present) wipers only work on one speed, why?

GMC Sierra T1XX (2019-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

464 words

Problem Statement

Learn how to diagnose and fix windshield wipers that only work on one speed in a 2019-Present GMC Sierra T1XX. Step-by-step guide with tools and parts required.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to avoid short circuits.

Symptoms

•Wipers operate only at one speed (usually high speed)
•Intermittent wiper function may not work
•No response when adjusting wiper speed settings
•No noise from the wiper motor at lower speeds
•Possible flickering or inconsistent operation of wipers

Diagnostic Steps

1
Inspect the wiper switch for any physical damage or wear.
2
Scan the vehicle for any diagnostic trouble codes (DTCs) related to the wiper system using an OBD-II scanner.
3
Check the fuse related to the wiper motor in the fuse box for continuity.
4
Test the wiper motor with a multimeter to ensure it is receiving the correct voltage at different speed settings.
5
Inspect wiring and connectors for corrosion, damage, or loose connections.
6
Verify the operation of the wiper relay by swapping it with a similar relay in the fuse box.

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

•Torx screwdriver
•OBD-II scanner
•Multimeter
•Relay puller (optional)

Parts Required

•Wiper switch (if faulty)
•Wiper relay (if faulty)
•Wiper motor (if faulty)

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Diagnostic Steps

1
Inspect the wiper switch for any physical damage or wear.
2
Scan the vehicle for any diagnostic trouble codes (DTCs) related to the wiper system using an OBD-II scanner.
3
Check the fuse related to the wiper motor in the fuse box for continuity.
4
Test the wiper motor with a multimeter to ensure it is receiving the correct voltage at different speed settings.
5
Inspect wiring and connectors for corrosion, damage, or loose connections.
6
Verify the operation of the wiper relay by swapping it with a similar relay in the fuse box.

Solution

1. Preparation

Gather tools and parts.
Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Wiper Switch

Sub-steps:
1. Remove the steering column cover using a Torx screwdriver.
2. Disconnect the wiper switch harness.
3. Remove the wiper switch from the steering column.
4. Install the new wiper switch and reconnect the harness.

Tools Required: Torx screwdriver, replacement wiper switch

3. Check and Replace Wiper Relay

Sub-steps:
1. Locate the fuse box and identify the wiper relay.
2. Remove the relay and visually inspect for any damage.
3. Replace with a new relay if necessary.

Tools Required: Relay puller (optional), replacement wiper relay

4. Test Wiper Motor

Sub-steps:
1. Reconnect the battery.
2. Use a multimeter to check voltage at the motor connector while toggling the wiper speeds.
3. If voltage is present but the motor does not respond, replace the wiper motor.

Tools Required: Multimeter, replacement wiper motor