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

GMC Sierra T1XX (2019-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

562 words

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 battery before working on electrical systems to avoid shocks and shorts.

Symptoms

•Windshield wipers do not activate when the control lever is engaged
•Wiper fluid does not spray when activated
•Wipers may function intermittently or at a slow speed
•No sound from wiper motor when attempting to operate
•Check engine light or other warning indicators may be illuminated

Diagnostic Steps

1
Inspect the wiper switch for any visible damage or wear.
2
Use an OBD-II scanner to check for error codes related to the wiper system.
3
Test the wiper motor by applying direct battery voltage to it.
4
Check the fuse for the windshield wipers in the fuse box.
5
Inspect the wiring harness for any signs of shorts or corrosion.
6
Verify the operation of the windshield washer pump.

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
•Basic hand tools (screwdrivers, socket set)
•Fuse puller

Parts Required

•Wiper motor (if faulty)
•Wiper switch (if faulty)
•Wiper fuse (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the wiper switch for any visible damage or wear.
2
Use an OBD-II scanner to check for error codes related to the wiper system.
3
Test the wiper motor by applying direct battery voltage to it.
4
Check the fuse for the windshield wipers in the fuse box.
5
Inspect the wiring harness for any signs of shorts or corrosion.
6
Verify the operation of the windshield washer pump.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, basic hand tools (screwdrivers, socket set)
Disconnect the negative battery cable to ensure safety during repairs.

2. Check and Replace Wiper Fuse

Locate the fuse box, usually found under the dashboard or in the engine compartment.
Identify the fuse for the windshield wipers (refer to the fuse diagram on the fuse box cover).
Remove the fuse using a fuse puller or pliers.
Inspect the fuse; if it is blown, replace it with a fuse of the same amperage rating.

3. Test and Replace Wiper Motor

Tools Required: Multimeter, basic hand tools
Reconnect the battery and test the wiper motor by turning on the wipers.
If there’s no activation, disconnect the wiper motor connector.
Use a multimeter to check for voltage at the motor connector while the wipers are being activated.
If voltage is present and the motor does not operate, replace the wiper motor:
- Remove any covers or panels blocking access to the wiper motor.
- Unbolt the motor from its mounting bracket.
- Disconnect the wiring harness and remove the motor from the vehicle.
- Install the new motor by reversing the removal steps.

4. Inspect and Replace Wiper Switch

If the wiper motor is functioning, the issue may lie in the wiper switch:
- Remove the steering column cover to access the wiper switch.
- Disconnect the switch connector and use a multimeter to test for continuity while operating the switch.
- If faulty, replace the wiper switch:
  - Remove the screws securing the switch.
  - Install the new switch and reassemble the steering column cover.