how to fix the wiper blades not working in BMW 3 Series E90/E91 (2005-2012)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.
• Ensure the vehicle is parked on a level surface with the ignition off.

2. Inspect and Replace the Wiper Switch

• Tools Required: Torx screwdriver, multimeter.
• Remove the steering column cover by unscrewing the Torx screws.
• Disconnect the wiper switch connector.
• Use a multimeter to test the continuity of the switch. Replace if faulty.
• Reconnect the switch and reassemble the steering column cover.

3. Check and Replace the Wiper Motor

• Tools Required: Socket set, multimeter, flat-head screwdriver.
• Locate the wiper motor, typically under the plastic cowl at the base of the windshield.
• Disconnect the wiring harness from the wiper motor.
• Test the motor by applying direct power; if it does not function, replace the motor.
• If replacing, remove the motor by unscrewing the mounting bolts and detach the linkage.
• Install the new motor, reconnect the linkage, and bolt it in place.

4. Inspect and Repair Wiring

• Tools Required: Wire strippers, electrical tape, soldering iron (if necessary).
• Trace the wiring harness from the wiper motor to the switch and fuse box.
• Look for any damaged or frayed wires. Repair as necessary by splicing and covering with electrical tape.
• Ensure all connectors are tight and free of corrosion.

5. Reassemble and Test

• Reinstall any covers or panels removed during the process.
• Reconnect the vehicle's battery.
• Test the wiper system to ensure proper operation across all settings.