my BMW 3 Series G20/G21 (2019-2024) windshield wipers won't stop running

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

541 words

Problem Statement

The windshield wipers on a BMW 3 Series G20/G21 (2019-2024) are continuously running, failing to turn off even when the vehicle is not in use.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Windshield wipers operate continuously
•Wiper control stalk does not respond
•Possible "wiper motor stuck" error code
•Intermittent wiper settings ineffective
•Possible battery drain due to constant operation

Diagnostic Steps

1
Inspect the wiper control stalk for any physical damage or debris.
2
Scan the vehicle's onboard diagnostics (OBD) system for any error codes related to the windshield wiper system.
3
Check the wiper motor relay for proper operation and possible sticking.
4
Verify the wiper motor's electrical connections and inspect for any corrosion or loose wires.
5
Test the wiper switch for continuity using a multimeter.
6
Examine the body control module (BCM) for software updates or malfunctions.

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)

Parts Required

•Wiper control stalk (if damaged)
•Wiper motor relay (if faulty)
•Wiper switch (if defective)

Related Faults

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Diagnostic Steps

1
Inspect the wiper control stalk for any physical damage or debris.
2
Scan the vehicle's onboard diagnostics (OBD) system for any error codes related to the windshield wiper system.
3
Check the wiper motor relay for proper operation and possible sticking.
4
Verify the wiper motor's electrical connections and inspect for any corrosion or loose wires.
5
Test the wiper switch for continuity using a multimeter.
6
Examine the body control module (BCM) for software updates or malfunctions.

Solution

1. Preparation

Tools Needed: OBD-II scanner, multimeter, basic hand tools (screwdrivers, socket set).
Disconnect the negative terminal of the battery to ensure safety while working on electrical components.

2. Inspect the Wiper Control Stalk

Remove the steering column covers using a screwdriver.
Visually inspect the wiper control stalk for any cracks or broken components.
If damaged, replace the wiper control stalk by disconnecting the wiring harness and securing the new stalk in place.

3. Check and Replace the Wiper Motor Relay

Locate the fuse box, typically found under the dashboard or in the engine compartment.
Identify the wiper motor relay (refer to the owner's manual for exact location).
Remove the relay and inspect for any signs of damage or corrosion.
Replace the relay with a new one if necessary, ensuring it is properly seated.

4. Inspect the Wiper Motor Connections

Reconnect the battery temporarily and activate the wipers to test functionality.
If wipers remain on, disconnect the battery again and inspect the wiper motor's electrical connections.
Clean any corrosion from connectors and ensure all wires are securely attached.

5. Test the Wiper Switch

Using a multimeter, perform a continuity test on the wiper switch while operating it through all its settings.
If the test indicates a failure, replace the wiper switch by removing the steering column covers and disconnecting the wiring harness.