The OBD-II trouble code B1747, which stands for „Mirror Passenger Horizontal Switch Circuit Short To Battery,” indicates an electrical issue within your vehicle’s passenger side mirror control system. Specifically, this code points to a short circuit where the horizontal switch wiring is receiving constant battery voltage, disrupting the normal function of the mirror adjustment mechanism. This system plays a crucial role in allowing you to adjust your passenger mirror electronically for optimal visibility and safety while driving. If you’ve encountered this code, keep scrolling—this article will guide you through how to identify the problem, explore common causes, and offer practical solutions to get your mirror controls back in proper working order.

What symptoms might indicate the B1747 error?

When this issue occurs, certain functionalities related to the passenger side mirror may be affected. Drivers might notice unusual behavior or lack of control when adjusting the mirror.

  • 1. Mirror Adjustment Failure: The passenger side mirror does not respond to horizontal adjustment commands.
  • 2. Erratic Mirror Movement: The mirror moves unpredictably or stops abruptly during adjustment attempts.
  • 3. Control Switch Unresponsiveness: The switch used to adjust the passenger mirror shows no reaction when pressed.
  • 4. Mirror Position Memory Loss: Previously saved mirror positions may reset or fail to recall correctly.
  • 5. Dashboard Warning Light: A warning indicator related to the mirror system may illuminate on the dashboard.

      • Common reasons that can lead to error code B1747

      This error indicates an electrical issue related to the passenger side mirror switch. Several common technical problems can cause this fault to appear.

      • 1. Wiring Short Circuit: Damaged or frayed wiring causing unintended connection to the battery
      • 2. Faulty Mirror Switch: Internal malfunction within the horizontal switch assembly
      • 3. Corroded Connector: Oxidation or moisture leading to poor electrical contact
      • 4. Blown Fuse: A fuse protecting the mirror circuit has failed, affecting current flow
      • 5. Improper Grounding: Poor or missing ground connection causing abnormal voltage readings

      B1747 at-home error code check step by step

      When diagnosing issues related to the B1747 – Mirror Passenger Horizontal Switch Circuit Short To Battery error at home, having a clear, step-by-step approach can save you both time and money. Using your own tools along with an OBD-II scanner allows you to pinpoint the fault accurately without needing immediate professional help.

      Start by connecting your OBD-II scanner to the vehicle’s diagnostic port, usually located under the dashboard. Use the scanner to confirm the presence of the specific code and monitor live data from the mirror switch circuit if available. Next, visually inspect the passenger side mirror’s wiring harness for any obvious signs of damage or exposed wires that could cause a short to battery. Using a multimeter, test for continuity between the switch circuit wires and ground; a short will typically show continuity where there shouldn’t be any. Then measure voltage on the horizontal switch circuit wires with the ignition on—if you detect battery voltage where it shouldn’t be, this confirms a short to power in the circuit. Finally, if possible, disconnect the mirror switch connector and retest; if the code clears or voltage readings change accordingly, the issue is likely within the mirror assembly or its wiring.

      B1747 error repair at home: What can you do yourself and when do you need a mechanic?

      The issue with the passenger mirror switch circuit can often be traced back to simple electrical faults that are manageable at home. Trying these practical fixes might save you a trip to the mechanic and resolve the problem quickly.

      • 1. Fuse Inspection: Check the related fuse in the fuse box for any signs of damage or blowing, and replace it if necessary.
      • 2. Wiring Check: Inspect the wiring harness connected to the mirror switch for any visible damage, fraying, or corrosion and repair or replace damaged sections.
      • 3. Connector Cleaning: Disconnect and clean the mirror switch connectors using electrical contact cleaner to remove dirt or oxidation that could cause a short circuit.
      • 4. Switch Replacement: If accessible, test the passenger mirror horizontal switch by replacing it with a known good unit to determine if the switch itself is faulty.

      If these steps do not resolve the issue, or if you encounter complex wiring problems or internal component failures, it is advisable to consult a professional service center for a thorough diagnosis and repair.

      Consequences of error B1747 if you don’t fix it in time

      A persistent electrical fault in a vehicle’s mirror system can lead to significant long-term issues if left unaddressed. These consequences impact both safety and overall vehicle functionality.

      • 1. Battery Drain: Continuous short circuits cause excessive battery consumption, leading to frequent battery failures and potential breakdowns.
      • 2. Electrical System Damage: Prolonged faults can damage wiring harnesses and related electronic components, resulting in costly repairs.
      • 3. Mirror Malfunction: The affected mirror may lose its adjustability or heating function, reducing driver visibility and convenience.
      • 4. Increased Fire Risk: Persistent electrical shorts raise the risk of overheating and potentially causing an electrical fire within the vehicle.
      • 5. Safety Hazards: Impaired mirror functionality compromises situational awareness, increasing the likelihood of accidents.

          • Here’s how to prevent the B1747 error with a few simple steps

          The B1747 error code can cause inconvenience and potential damage if not addressed properly. Implementing preventive measures can help avoid this issue effectively.