how to fix my BMW 3 Series E90/E91 (2005-2012) wipers that won't turn off?

BMW 3 Series E90/E91 (2005-2012)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

524 words

Problem Statement

The windshield wipers on a BMW 3 Series E90/E91 (2005-2012) are malfunctioning and will not turn off, indicating a possible issue with the wiper control system.

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.
•Allow the vehicle to cool before working on components near the engine.

Symptoms

•Wipers continuously running even when the switch is off
•Intermittent wiper settings not functioning
•Wiper control stalk feeling loose or unresponsive
•Check control warning lights related to wiper system may illuminate
•No sound from wiper motor when attempting to turn them off

Diagnostic Steps

1
Inspect the wiper control stalk for physical damage or wear.
2
Use an OBD-II scanner to check for any relevant error codes related to the wiper system.
3
Examine the wiper relay in the fuse box for faults or corrosion.
4
Test the wiper motor for continuous power supply when the wiper switch is off.
5
Check the wiring harness connected to the wiper motor for shorts or disconnections.

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 set
•Socket set
•Wrench set

Parts Required

•Wiper control stalk (if faulty)
•Wiper relay (if faulty)
•Wiper motor (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the wiper control stalk for physical damage or wear.
2
Use an OBD-II scanner to check for any relevant error codes related to the wiper system.
3
Examine the wiper relay in the fuse box for faults or corrosion.
4
Test the wiper motor for continuous power supply when the wiper switch is off.
5
Check the wiring harness connected to the wiper motor for shorts or disconnections.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the vehicle is parked on a flat surface with the wipers in the "off" position.

2. Inspect the Wiper Control Stalk

Remove the steering column cover using a torx screwdriver.
Disconnect the wiring harness from the control stalk.
Inspect the stalk for any visible damage or wear; replace if necessary.

3. Check the Wiper Relay

Locate the fuse box (usually under the dashboard or in the engine compartment).
Identify the relay responsible for the windshield wipers using the fuse box diagram.
Remove the relay and check for continuity using a multimeter. Replace if faulty.

4. Test and Replace the Wiper Motor

Reconnect the battery and turn the ignition on.
Use a multimeter to check the voltage at the wiper motor connector while switching the wipers on and off.
If the motor receives power when the switch is off, the motor is faulty and should be replaced.
To replace, disconnect the wiper arms and remove the retaining bolts securing the motor to the vehicle. Install the new motor and reattach wiper arms.

5. Reassemble and Test

Reattach the steering column cover and reconnect the battery terminal.
Test the wipers through all settings to ensure proper function.