my BMW 3 Series G20/G21 (2019-2024) wipers don't work on all speeds, what's wrong?

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

401 words

Problem Statement

The windshield wipers on a BMW 3 Series G20/G21 (2019-2024) are malfunctioning, as they do not operate at all speeds.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock or short circuits.

Symptoms

•Wipers do not function on low speed
•Wipers do not function on high speed
•Intermittent wiper mode may still operate
•No unusual noises from the wiper motor
•Dashboard warning lights may not be illuminated

Diagnostic Steps

1
Inspect the wiper switch for any visible damage or wear.
2
Use an OBD-II scanner to check for any related error codes.
3
Test the wiper motor's power supply using a multimeter.
4
Check the wiper relay for proper operation.
5
Inspect the wiring harness for any signs of damage or loose connections.
6
Verify the condition of the wiper fuse by checking for continuity.

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
•Screwdrivers (flathead and Phillips)
•Electrical tape or heat shrink tubing

Parts Required

•Wiper switch (if faulty)
•Wiper relay (if faulty)

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 any related error codes.
3
Test the wiper motor's power supply using a multimeter.
4
Check the wiper relay for proper operation.
5
Inspect the wiring harness for any signs of damage or loose connections.
6
Verify the condition of the wiper fuse by checking for continuity.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to ensure safety.
Ensure the vehicle is parked on a level surface with the ignition off.

2. Inspect and Replace the Wiper Switch (if needed)

Sub-steps:
1. Remove the steering column cover using a screwdriver.
2. Disconnect the wiring harness from the wiper switch.
3. Remove the wiper switch from the steering column.
4. Install the new wiper switch by reversing the removal steps.
5. Reconnect the wiring harness securely.

3. Test and Replace the Wiper Relay (if faulty)

Sub-steps:
1. Locate the wiper relay in the fuse box (refer to the owner's manual for exact location).
2. Remove the relay and inspect it for damage.
3. If necessary, replace it with a new relay.
4. Reinstall the relay in the fuse box.

4. Inspect and Repair Wiring

Sub-steps:
1. Inspect the wiring harness leading to the wiper motor for any visible damage or corrosion.
2. Repair any damaged wires using electrical tape or heat shrink tubing.
3. Ensure all connections are secure and free of corrosion.

5. Reconnect Battery and Test Wipers

Sub-steps:
1. Reconnect the vehicle battery.
2. Test the wipers on all speeds to ensure proper function.

Tools Required:

OBD-II scanner
Multimeter
Screwdrivers (flathead and Phillips)
Electrical tape or heat shrink tubing

Parts Required:

Wiper switch (if faulty)
Wiper relay (if faulty)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect the battery before working on electrical systems to avoid shock or short circuits.