how to fix BMW 3 Series G20/G21 (2019-2024) windshield wipers not working

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

549 words

Problem Statement

The windshield wipers on a BMW 3 Series G20/G21 (2019-2024) are not functioning, which can impair visibility during adverse weather conditions.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shocks or shorts.
•Allow engine to cool before starting any work on the vehicle.

Symptoms

•Windshield wipers do not activate when switch is engaged
•Wiper motor makes no noise when attempting to operate
•Wipers are stuck in one position
•Intermittent wiper setting does not function
•Washer fluid spray is not working (if applicable)

Diagnostic Steps

1
Check the fuse related to the windshield wipers using the fuse box diagram.
2
Use an OBD-II scanner to check for any related error codes in the Body Control Module.
3
Inspect the wiper switch for physical damage or wear.
4
Test the wiper motor by applying direct power to it outside of the vehicle.
5
Inspect the wiring harness for any signs of damage or disconnection.
6
Verify that the wiper linkage is not obstructed or broken.

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
•Socket set
•Ratchet
•Wiper arm puller or flathead screwdriver

Parts Required

•Wiper motor (if defective)
•Wiper blades (if worn)

Related Faults

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Diagnostic Steps

1
Check the fuse related to the windshield wipers using the fuse box diagram.
2
Use an OBD-II scanner to check for any related error codes in the Body Control Module.
3
Inspect the wiper switch for physical damage or wear.
4
Test the wiper motor by applying direct power to it outside of the vehicle.
5
Inspect the wiring harness for any signs of damage or disconnection.
6
Verify that the wiper linkage is not obstructed or broken.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to prevent any electrical shorts.
Ensure the vehicle is on a flat surface with adequate lighting.

2. Remove the Wiper Arms

Tools Required: Wiper arm puller or flathead screwdriver.
Remove the plastic covers at the base of the wiper arms.
Use the puller or screwdriver to gently pry off the wiper arms from the splines.
Set the wiper arms aside in a safe location.

3. Access the Wiper Motor

Tools Required: Socket set, ratchet.
Remove the plastic cowl cover by unscrewing the fasteners securing it.
Carefully lift the cowl to access the wiper motor assembly.

4. Inspect and Replace Components

Check the wiper motor for any visible damage or burnt areas.
If the motor is defective, disconnect the wiring harness and unbolt the motor from the assembly.
Replace it with a new wiper motor, ensuring it is properly aligned with the linkage.
Reconnect the wiring harness securely.

5. Reassemble

Reattach the cowl cover, tightening fasteners to the manufacturer's torque specifications.
Reinstall the wiper arms onto the splines, ensuring they are in the correct position.
Replace the plastic covers over the wiper arms.

6. Final Steps

Reconnect the vehicle battery.
Test the wipers on all settings to ensure functionality.