Wiper Motor, Rear

Rear Wiper Motor: Precision, Performance, and Reliability for Clear Rear Vision

The rear wiper motor is a critical yet often overlooked component that ensures clear visibility through your vehicle’s rear window. Whether you’re navigating rain, snow, or dust, the rear wiper motor powers the wiper arm, maintaining a streak-free view and supporting safe driving. Its performance is especially vital for SUVs, hatchbacks, and wagons, where rearward visibility is essential for maneuvering and parking.

Most drivers don’t realize that a sluggish or non-functional rear wiper can increase stopping distance by up to 15% in wet conditions due to impaired rearward visibility. Unlike the front wiper system, the rear wiper motor operates in a more exposed environment, often facing more debris and temperature extremes. When the rear wiper fails, it’s not just a minor inconvenience—it can compromise safety, especially during adverse weather. Many rear wiper issues stem from overlooked maintenance or hidden electrical faults, which can also affect related systems like the Air Box/Air Cleaner and even the rear defroster circuit.

Smart solutions start with regular inspection and timely replacement of the rear wiper motor. Technicians recommend checking the wiring harness, ground connections, and the wiper arm mechanism for binding or corrosion. Upgrading to OEM or high-quality aftermarket rear wiper motors ensures compatibility and longevity. When replacing the rear wiper motor, it’s wise to inspect related systems such as the AC Compressor Bracket and ensure the rear window washer system is functioning. AutoPartEx provides a comprehensive selection of rear wiper motors, including rare and hard-to-find models, with detailed fitment data and technical support.

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Complete Rear Wiper Motor Technical Reference

Rear Wiper Motor Construction and Operation

The rear wiper motor typically consists of a compact DC electric motor, reduction gears, and an integrated linkage system. The motor receives power from the vehicle’s electrical system, often via a relay controlled by the body control module. When activated, the motor rotates a shaft connected to the wiper arm, converting rotational motion into the sweeping action required to clear the rear window. Key specifications include operating voltage (usually 12V), torque output (ranging from 2–5 Nm), and duty cycle ratings to withstand continuous use in harsh conditions.

Common Failure Modes and Diagnostic Procedures

Rear wiper motors are susceptible to several failure modes: water ingress causing internal corrosion, worn carbon brushes, seized gear mechanisms, and electrical faults in the wiring or relay. Diagnostic steps include checking for voltage at the motor connector, measuring resistance across the motor windings (typically 1–5 ohms), and inspecting for physical obstructions in the wiper linkage. Advanced diagnostics may involve using a scan tool to check for body control module fault codes related to the rear wiper circuit.

Replacement, Calibration, and Best Practices

When replacing a rear wiper motor, always disconnect the battery to prevent accidental operation. Remove the wiper arm and trim panels to access the motor assembly. After installation, calibrate the wiper park position according to manufacturer specifications—typically aligning the wiper arm parallel to the bottom edge of the rear window. Lubricate pivot points and check for smooth operation. It’s also recommended to replace the rear wiper blade and inspect the washer nozzle for proper spray pattern.

Engineering Excellence & Technical Specifications

Technical Excellence Section

Rear wiper motors supplied by AutoPartEx meet or exceed OEM specifications, with torque ratings between 2–5 Nm, sealed housings rated to IP54 or higher, and gear assemblies designed for 100,000+ cycles. Electrical connectors are corrosion-resistant, and mounting points match factory tolerances for quick installation.

Performance Analysis Section

Our rear wiper motors undergo rigorous bench testing for sweep speed (typically 30–45 cycles per minute), stall torque, and noise levels (<50 dB at 1 meter). Comparative analysis shows that AutoPartEx-sourced motors maintain consistent performance even after 1,000 hours of continuous operation, outperforming many generic aftermarket options.

Innovation & Technology Section

Advanced models feature integrated park sensors, variable speed control, and compatibility with smart body control modules. Some units offer brushless motor technology for extended lifespan and reduced maintenance. Technical documentation includes wiring diagrams and calibration procedures for seamless integration.

Quality & Manufacturing Section

All rear wiper motors are manufactured under ISO 9001-certified processes, with 100% end-of-line testing for electrical continuity, waterproofing, and gear backlash. Quality control includes salt spray testing and thermal cycling to ensure reliability in extreme environments.

Rear Wiper Motor Parts & Service Information

Rear Wiper Motor Replacement Procedure

Disconnect the battery, remove the rear wiper arm and trim, unbolt the old motor, install the new unit, align the wiper arm, and test all functions. Calibration may be required for proper park position.

Difficulty: Moderate • Tools: Socket set, trim removal tools, torque wrench, multimeter

Rear Wiper Motor Maintenance Schedule

Inspect the rear wiper motor and linkage annually, especially after winter or heavy rain. Clean electrical connectors, lubricate pivot points, and check for smooth operation.

Difficulty: Easy • Tools: Lubricant, cleaning cloth, inspection mirror

Rear Wiper System Diagnostics

Test for voltage at the motor connector, check ground continuity, inspect for blown fuses, and scan for BCM fault codes. Examine linkage for binding or corrosion.

Difficulty: Expert • Tools: Multimeter, scan tool, wiring diagrams

Rear Wiper Motor Service and Warranty

Refer to manufacturer warranty terms for coverage. Use only OEM or high-quality aftermarket parts for replacement. Keep records of service and part numbers for future reference.

Difficulty: Easy • Tools: Service documentation, warranty paperwork, OEM part catalog