If your vehicle’s onboard diagnostic system has triggered the OBD-II trouble code B1473 – Wiper Low Speed Circuit Motor Failure, it indicates an issue within your windshield wiper system, specifically related to the motor responsible for operating the wipers at low speed. This code typically points to electrical or mechanical problems that prevent the wipers from functioning correctly in their low-speed setting, which is crucial for maintaining clear visibility during light rain or drizzle. Understanding and addressing this fault promptly can ensure your safety on the road. Keep scrolling to discover practical guidance on how to identify this issue, explore its common causes, and learn effective repair solutions.

What symptoms might indicate the B1473 error?

Wiper operation issues can significantly affect driving visibility and safety. Recognizing the symptoms early helps in timely intervention and prevents further complications.

  • 1. Reduced wiping speed: The wipers move slower than usual during low-speed settings.
  • 2. Intermittent wiper movement: The wipers may stop and start unexpectedly at low speeds.
  • 3. Wipers stuck in one position: The wipers fail to return to their resting position after use.
  • 4. No response on low speed setting: Activating the low-speed mode does not trigger any wiper movement.
  • 5. Unusual noises from wiper motor area: Grinding or buzzing sounds are heard when attempting to use low-speed wiping.

      • Common reasons that can lead to error code B1473

      • 1. Faulty Wiper Motor: The motor may have internal wear or electrical failure causing insufficient power output.
      • 2. Damaged Wiring Harness: Broken, frayed, or corroded wires can interrupt the electrical flow to the motor.
      • 3. Defective Wiper Motor Relay: A malfunctioning relay can prevent proper voltage from reaching the motor at low speeds.
      • 4. Blown Fuse: A fuse related to the wiper motor circuit might be blown, disrupting power supply.
      • 5. Faulty Wiper Switch: The control switch may fail to send correct signals for low-speed operation due to internal defects.

      B1473 at-home error code check step by step

      Diagnosing a B1473 – Wiper Low Speed Circuit Motor Failure issue at home is entirely feasible with some basic tools and a systematic approach. By following these steps, you can pinpoint whether the wiper motor’s low-speed circuit is faulty without immediately resorting to professional help.

      First, connect an OBD-II scanner to your vehicle’s diagnostic port to confirm the presence of the fault code and monitor real-time data related to the wiper system. Next, with the ignition on but the engine off, test the wiper switch by activating the low-speed setting while observing the motor’s response; if it doesn’t run or runs erratically, proceed to check the wiring and connectors for any signs of corrosion or damage. Using a multimeter, measure the voltage at the motor terminals during low-speed operation—if voltage is present but the motor doesn’t function properly, this indicates a motor failure. Conversely, absence of voltage suggests a wiring or control module issue. Finally, if accessible, test the resistance of the motor windings to detect any internal shorts or open circuits that could cause malfunction.

      B1473 error repair at home: What can you do yourself and when do you need a mechanic?

      Wiper system issues can often be addressed at home with some basic troubleshooting and repairs. Early intervention might save you time and money before seeking professional help.

      • 1. Fuse Check: Inspect the wiper fuse in the fuse box and replace it if blown to restore electrical flow to the motor.
      • 2. Wiring Inspection: Examine the wiring harness connected to the wiper motor for any signs of damage or corrosion and repair or clean as needed.
      • 3. Motor Connector Cleaning: Disconnect the motor’s electrical connector and clean the contacts thoroughly to ensure a solid connection.
      • 4. Motor Lubrication: Apply appropriate lubricant to the wiper motor shaft and linkage to reduce resistance and improve motor function.

      If these steps do not resolve the issue or if you encounter complex electrical faults, unusual noises, or persistent failure, it is advisable to consult a qualified service technician for a detailed diagnosis and repair.

      Consequences of error B1473 if you don’t fix it in time

      Ignoring this issue can lead to several serious long-term consequences affecting vehicle safety and functionality. Addressing it promptly is crucial to avoid further complications.

      • 1. Reduced Visibility: Impaired wiper function can significantly decrease driver visibility during adverse weather conditions, increasing the risk of accidents.
      • 2. Increased Windshield Damage: Continuous malfunction may cause uneven or erratic wiper movement, leading to scratches or permanent damage to the windshield surface.
      • 3. Electrical System Strain: A persistent fault in the wiper motor circuit can place additional load on the electrical system, potentially causing further component failures.
      • 4. Legal and Safety Compliance Issues: Non-functional wipers may result in failing vehicle inspections and violate road safety regulations, leading to fines or restrictions.
      • 5. Higher Repair Costs: Delaying repair can escalate the damage, resulting in more extensive and expensive repairs over time.