my BMW 5 Series G30/G31 (2017-2024) wipers won’t turn off, how to fix it?

BMW 5 Series G30/G31 (2017-2024)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

502 words

Problem Statement

The windshield wipers on a BMW 5 Series G30/G31 (2017-2024) are continuously running and will not turn off, indicating a potential issue with the wiper control system.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Wipers operate continuously regardless of switch position
•Wiper fluid may spray unintentionally
•Wiper motor may be running noisily or erratically
•Wiper function may be erratic, switching speeds unexpectedly
•Dashboard warning lights related to electrical systems may illuminate

Diagnostic Steps

1
Inspect the wiper switch for physical damage or malfunction.
2
Use an OBD-II scanner to check for any fault codes related to the wiper system.
3
Verify the operation of the wiper relay by testing or swapping with a known good relay.
4
Check the wiper motor wiring harness for frayed wires or poor connections.
5
Measure the voltage supply to the wiper motor with a multimeter while toggling the wiper switch.
6
Inspect the Body Control Module (BCM) for faults or software issues.

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
•Screwdriver set
•Socket set

Parts Required

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

Related Faults

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Diagnostic Steps

1
Inspect the wiper switch for physical damage or malfunction.
2
Use an OBD-II scanner to check for any fault codes related to the wiper system.
3
Verify the operation of the wiper relay by testing or swapping with a known good relay.
4
Check the wiper motor wiring harness for frayed wires or poor connections.
5
Measure the voltage supply to the wiper motor with a multimeter while toggling the wiper switch.
6
Inspect the Body Control Module (BCM) for faults or software issues.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect and Replace the Wiper Relay

Locate the wiper relay in the fuse box (consult owner's manual for specific location).
Remove the relay by pulling it straight out.
Inspect for any signs of damage or corrosion.
Replace with a new relay if damaged.

3. Check and Replace the Wiper Switch

Remove the steering column cover using a screwdriver or socket set.
Disconnect the electrical connector from the wiper switch.
Test the switch with a multimeter for continuity.
If faulty, replace the wiper switch with a new one and reconnect the wiring.

4. Inspect the Wiper Motor and Wiring

Visually inspect the wiper motor for signs of wear or damage.
Check the wiring harness for any frayed wires or loose connections.
If the motor is faulty, remove it by unscrewing the mounting bolts and disconnecting the electrical connector.
Install a new wiper motor and secure it in place.

5. Reconnect Battery and Test

Reconnect the vehicle battery.
Test the wipers to ensure proper functionality and that they turn off when the switch is in the off position.