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

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

564 words

Problem Statement

The windshield wipers on a BMW 3 Series G20/G21 (2019-2024) are not functioning, indicating a potential electrical or mechanical failure within the wiper system.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts or shocks.

Symptoms

•Windshield wipers do not activate when switched on
•Wiper fluid not spraying
•Wiper motor noise or burning smell (if applicable)
•Intermittent wiper function failure
•Dashboard warning light for wiper system (if applicable)

Diagnostic Steps

1
Check the wiper switch for proper operation by testing it in different settings.
2
Inspect the fuses related to the wiper system using the vehicle’s fuse box diagram.
3
Use an OBD-II scanner to check for any related error codes that indicate electrical faults.
4
Test the wiper motor by applying direct power to it to see if it operates.
5
Inspect the wiring and connectors for any corrosion, damage, or loose connections.
6
Check the wiper relay for proper function 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

•Socket set
•Multimeter
•Screwdrivers
•OBD-II scanner

Parts Required

•Wiper motor (if found faulty)
•Wiper relay (if found faulty)
•Wiper fuse (if blown)

Related Faults

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Diagnostic Steps

1
Check the wiper switch for proper operation by testing it in different settings.
2
Inspect the fuses related to the wiper system using the vehicle’s fuse box diagram.
3
Use an OBD-II scanner to check for any related error codes that indicate electrical faults.
4
Test the wiper motor by applying direct power to it to see if it operates.
5
Inspect the wiring and connectors for any corrosion, damage, or loose connections.
6
Check the wiper relay for proper function by swapping it with a known good relay.

Solution

1. Preparation

Tools Required:
- Socket set
- Multimeter
- Screwdrivers
- OBD-II scanner
Disconnect the negative terminal of the battery to ensure safety before working on electrical components.

2. Inspect and Replace Fuses

Locate the fuse box according to the owner’s manual.
Remove the cover and identify the wiper fuse.
Use a multimeter to check the continuity of the fuse.
If blown, replace it with a fuse of the same amperage.

3. Test and Replace Wiper Motor

Reconnect the battery and use a multimeter to check for voltage at the wiper motor connector while activating the wiper switch.
If no voltage is present, trace the wiring back to the switch and relay for faults.
If voltage is present but the motor does not operate, remove the wiper motor:
- Disconnect the wiring harness.
- Remove the mounting bolts with a socket set.
- Replace with a new wiper motor, ensuring proper alignment and securing it with bolts.

4. Inspect Wiper Relay

Locate the relay associated with the wiper system in the fuse box.
Remove the relay and test it by swapping it with a known good relay or using a multimeter.
Replace the relay if it is found to be faulty.

5. Final Assembly

Reconnect all connectors and ensure that the wiper arms are properly positioned.
Reinstall the fuse box cover and reconnect the battery.
Test the wipers in all settings to ensure functionality.