my GMC Sierra windshield wipers are not working what to do

Learn how to diagnose and fix windshield wipers not working on GMC Sierra. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools: socket set, multimeter, screwdriver set, and safety glasses.
• Disconnect the battery to ensure safety.

2. Inspect and Replace the Wiper Fuse

• Locate the fuse box (usually found under the dashboard or in the engine compartment).
• Remove the wiper fuse using a fuse puller or needle-nose pliers.
• Inspect the fuse for a break in the filament.
• If faulty, replace it with a fuse of the same amperage (consult the owner’s manual for specifications).

3. Check the Wiper Motor and Connections

• Reconnect the battery and activate the wipers.
• If there is no movement, locate the wiper motor (usually under the cowl panel).
• Disconnect the motor connector.
• Use a multimeter to check for voltage at the connector when the wipers are switched on.
• If no voltage is present, trace back to the switch and wiring.

4. Replace the Wiper Motor (if necessary)

• If the wiper motor is faulty, remove the mounting bolts using a socket set.
• Disconnect the motor wiring harness.
• Install the new wiper motor by reversing the removal steps.
• Torque the mounting bolts to the manufacturer's specifications (usually around 10-15 ft-lbs).

5. Reinstall and Test

• Reconnect the battery.
• Activate the wipers to test functionality.
• Ensure the wipers operate smoothly without any obstructions.