Windshield Wiper Motor Reset Adjustment Guide

1. Core Methods of Wiper Motor Reset

The reset adjustment of windshield wiper motor fundamentally relies on mechanical position adjustment via power-off or execution of reset programs, ensuring the wiper arm accurately parks at the bottom of the windshield. Operational logic across vehicle models follows the standard process: power-off positioning → mechanical calibration → test verification, categorized into automatic reset and manual mechanical adjustment.

2. Automatic Reset Operation Steps (for mainstream models)

(1) Reset Switch/Program Method

• Step 1: Turn off the wiper and disconnect the vehicle power supply.

• Step 2: Long-press the reset button on the wiper control lever (some models require powering on to ACC gear first).

• Step 3: Observe if the wiper arm automatically parks at the bottom edge of the windshield (the parking position should be parallel to the glass bottom).

(2) Power-Off Reset Method (for models with intermittent gear)

• Step 1: Turn the key to ACC gear and set the wiper to the intermittent gear.

• Step 2: When the wiper runs to the lowest point (nearest to the glass bottom), immediately cut off the power.

• Step 3: Adjust the wiper arm to the ideal position and tighten the fixing screw (torque reference: 8-12N·m as per the vehicle manual).

3. Manual Mechanical Adjustment (for old models like Buick GL8)

(1) Reset Mechanism Clearance Calibration

• Disassembly: Remove the connecting bolt between the wiper arm and motor to expose the turntable assembly.

• Clearance standard: Check the clearance between the turntable spring plate and the stop baffle, which should be maintained at 4-8mm:

  • Clearance >8mm: Prone to wiper scraping the glass frame.

  • Clearance <4mm: Inadequate wiping coverage.

(2) Motor Shaft Positioning Calibration

• Step 1: Loosen the shaft fixing screw (mark the initial position).

• Step 2: Manually rotate the motor shaft to the stop position (judge the reset contact closure by the "click" sound).

• Step 3: Reinstall the wiper arm and test the wiping trajectory (required to cover over 90% of the glass without touching the frame).

4. Common Faults and Solutions

(1) Wiper Stops Midway

• Fault Symptom: After turning off the wiper, the wiper arm fails to park at the bottom of the windshield and stops in the middle.

• Solution: Inspect the reset contacts of the wiper motor for oxidation (if the contact surface shows black rust or dirt). Gently polish the contact points with fine-grit sandpaper to remove oxides and restore conductivity.

(2) Intermittent Non-Parking

• Fault Symptom: The wiper occasionally fails to park automatically, or delays/catches during parking.

• Solution: Disassemble the turntable assembly of the wiper motor, adjust the spring adjusting nut clockwise to enhance tension (each adjustment should not exceed 1/4 turn). If the spring is aged or deformed, replace it with a new reset spring (recommended to use original-specification parts).

(3) Wiping Angle Offset After Reset

• Fault Symptom: After reset, the wiping trajectory is not parallel to the glass edge, showing upward or downward tilting.

• Solution: Loosen the fixing screw of the wiper arm, use an angle gauge to calibrate the parallelism between the wiper arm and the glass bottom edge (standard angle: 0°). Retighten the screw and test the wiping trajectory (recommend repeating calibration 2-3 times for accuracy).