how to fix my BMW 3 Series F30/F31 (2012-2019) windshield wipers that won’t turn off?

BMW 3 Series F30/F31 (2012-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

498 words

Problem Statement

The windshield wipers on a BMW 3 Series F30/F31 (2012-2019) are not turning off, indicating a possible issue with the wiper relay, switch, or the body control module.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool before inspecting any components that may have been in use.

Symptoms

•Windshield wipers continue to operate despite being switched off
•Wiper speed settings may not function correctly
•Possible flickering of the wipers during operation
•Intermittent wiper function may be erratic
•No response from wiper controls on the stalk

Diagnostic Steps

1
Inspect the wiper switch on the steering column for any visible damage or malfunction.
2
Use an OBD-II scanner to check for any error codes related to the body control module or wiper system.
3
Test the wiper relay by removing it and checking for continuity with a multimeter.
4
Check the wiring and connectors leading to the wiper motor and control module for any signs of wear or damage.
5
Verify the operation of the wiper motor by applying direct power to ensure it functions correctly.

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
•Torx screwdriver
•Socket set

Parts Required

•Wiper switch (if defective)
•Wiper relay (if defective)
•Wiper motor (if defective)

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Diagnostic Steps

1
Inspect the wiper switch on the steering column for any visible damage or malfunction.
2
Use an OBD-II scanner to check for any error codes related to the body control module or wiper system.
3
Test the wiper relay by removing it and checking for continuity with a multimeter.
4
Check the wiring and connectors leading to the wiper motor and control module for any signs of wear or damage.
5
Verify the operation of the wiper motor by applying direct power to ensure it functions correctly.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface and the ignition is turned off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Wiper Switch

Remove the steering column cover using a Torx screwdriver.
Disconnect the wiper switch connector and inspect for corrosion or damage.
If defective, replace the wiper switch with a new unit.
Reattach the steering column cover and reconnect the battery.

3. Test and Replace Wiper Relay

Locate the wiper relay in the fuse box (refer to the owner’s manual for exact location).
Remove the relay and test it with a multimeter for continuity.
If faulty, replace with a new relay matching the specifications.
Reinsert the relay into its slot.

4. Check Wiper Motor and Wiring

Ensure the wiper motor is securely mounted and connections are tight.
Inspect wiring for any damage or shorts and repair as necessary.
If the motor does not function when powered directly, replace the wiper motor.