The B1586 diagnostic trouble code (DTC) indicates a problem with the horizontal position sensor of your vehicle's side mirror. This sensor plays a crucial role in the proper functioning of power mirrors, allowing them to adjust horizontally at the touch of a button. When the sensor reading falls outside the expected range or the circuit is open, this code is triggered, potentially impacting mirror functionality and driver visibility.
This article delves into the specifics of the B1586 code, offering a comprehensive understanding of its causes, symptoms, diagnostic procedures, and potential solutions. We aim to provide clear and actionable information to help you diagnose and address this issue effectively.
B1586 Code Overview
| Topic | Description | Possible Causes |
|---|---|---|
| Code Definition | Mirror Horiz. Pos Sensor - Out of Range/Open | Faulty mirror horizontal position sensor, wiring harness issues, connector problems, faulty mirror control module, open or shorted circuit, corrosion, mechanical binding. |
| Affected Systems | Power side mirror adjustment system | Mirror motor, mirror position sensor, wiring harness, connectors, mirror control module (part of the body control module in some vehicles). |
| Common Symptoms | Inability to adjust mirror horizontally, mirror adjustment working intermittently, mirror stuck in one position, mirror moving erratically, DTC stored in vehicle's computer. | Damaged sensor, broken wires, loose connections, corroded terminals, failed mirror motor, faulty control module. |
| Diagnostic Steps | Visual inspection of wiring and connectors, sensor testing with multimeter, circuit testing, module testing, checking for mechanical binding. | Damaged wiring, corroded connectors, faulty sensor, malfunctioning control module, obstructed mirror movement. |
| Possible Solutions | Repair or replace damaged wiring or connectors, replace the mirror horizontal position sensor, replace the mirror control module, address mechanical binding. | Wire repair, connector replacement, sensor replacement, control module replacement, lubrication of mirror mechanism. |
| Severity | Moderate - Affects convenience and potentially safety. | Impaired visibility due to inability to adjust mirrors, potential for accidents in certain situations. |
| Related Codes | B1585 (Mirror Vertical Position Sensor Circuit), B1587 (Mirror Motor Circuit), other body control module codes. | Wiring issues affecting multiple circuits, sensor failures across multiple axes, power supply problems within the control module. |
| Tools Needed | Multimeter, wiring diagram, scan tool, basic hand tools (screwdrivers, pliers, etc.). | Inaccurate sensor readings, intermittent circuit problems, difficulty accessing components, mechanical obstructions. |
| Typical Repair Costs | Varies depending on the cause; sensor replacement ($50-$200), wiring repair ($50-$150), module replacement ($200-$500+ labor). | Expensive module replacements, extensive wiring repairs, difficulty locating the root cause of the problem. |
| DIY Difficulty | Moderate - Requires basic electrical knowledge and access to wiring diagrams. | Incorrect diagnosis, further damage to wiring or components, safety hazards when working with electrical systems. |
Detailed Explanations
Code Definition: The B1586 code specifically indicates that the vehicle's computer has detected a problem with the signal coming from the horizontal position sensor within the power side mirror system. The signal is either outside the acceptable range (too high or too low) or the circuit is completely open (no signal at all). This means the system cannot accurately determine the mirror's horizontal position.
Affected Systems: This code directly affects the power side mirror adjustment system. This system relies on the mirror motor, the mirror position sensor (both horizontal and vertical, but in this case specifically horizontal), the wiring harness connecting these components, the connectors that join the wires, and the mirror control module, which may be integrated into the body control module (BCM). A fault in any of these components can trigger the B1586 code.
Common Symptoms: The most obvious symptom is the inability to adjust the mirror horizontally using the power mirror controls. The mirror might work intermittently, be stuck in one position, or move erratically. The DTC (Diagnostic Trouble Code) B1586 will also be stored in the vehicle's computer and can be retrieved using a scan tool.
Diagnostic Steps: The diagnostic process starts with a visual inspection of the wiring and connectors associated with the mirror system. Look for any signs of damage, corrosion, or loose connections. Next, use a multimeter to test the sensor itself, checking for proper resistance and voltage. The circuit should be tested for continuity and shorts to ground or voltage. If the wiring and sensor seem fine, the mirror control module might be the culprit and requires further testing. Finally, physically inspect the mirror mechanism for any signs of mechanical binding that could be preventing proper movement and affecting the sensor reading.
Possible Solutions: Depending on the diagnosis, the solution could involve repairing or replacing damaged wiring or connectors. If the sensor is faulty, it will need to be replaced. In some cases, the mirror control module might be the problem and require replacement. If mechanical binding is the issue, lubricating the mirror mechanism might resolve the problem.
Severity: The severity of the B1586 code is generally considered moderate. While it doesn't typically prevent the vehicle from being driven, it can impair visibility and potentially increase the risk of accidents, especially if the mirror is stuck in an unfavorable position.
Related Codes: The B1586 code is often related to other codes affecting the power mirror system, such as B1585 (Mirror Vertical Position Sensor Circuit) and B1587 (Mirror Motor Circuit). These codes can indicate broader issues within the mirror system, such as wiring problems affecting multiple circuits, sensor failures across multiple axes, or power supply problems within the control module.
Tools Needed: Diagnosing and repairing the B1586 code typically requires a few essential tools. A multimeter is crucial for testing the sensor and circuit continuity. A wiring diagram specific to your vehicle is essential for tracing the wiring and identifying the correct pins. A scan tool is needed to retrieve the DTC and clear it after the repair. Basic hand tools, such as screwdrivers and pliers, will be needed to access and work on the components.
Typical Repair Costs: The repair cost can vary significantly depending on the cause of the problem. Replacing the sensor itself typically costs between $50 and $200. Wiring repairs can range from $50 to $150, depending on the extent of the damage. Replacing the mirror control module can be the most expensive option, potentially costing between $200 and $500 or more, plus labor.
DIY Difficulty: The DIY difficulty is considered moderate. It requires basic electrical knowledge and the ability to read and interpret wiring diagrams. Incorrect diagnosis or repairs can potentially cause further damage to the wiring or components. Safety precautions should be taken when working with electrical systems.
Frequently Asked Questions
What does the B1586 code mean? It means there's a problem with the horizontal position sensor in your car's side mirror, indicating the sensor's signal is either out of range or the circuit is open.
Can I drive with the B1586 code? Yes, but it's not recommended. The code indicates a problem with your mirror adjustment, which can affect your visibility and safety.
What are the most common causes of the B1586 code? Faulty sensor, damaged wiring or connectors, or a malfunctioning mirror control module are the most common causes.
How do I fix the B1586 code? Diagnose the problem first by checking the wiring, sensor, and module. Then, repair or replace the faulty component.
Do I need a special tool to diagnose the B1586 code? Yes, a multimeter and a scan tool are recommended for accurate diagnosis. A wiring diagram is also essential.
Conclusion
The B1586 code signals a problem with the horizontal position sensor in your vehicle's power side mirror system. Careful diagnosis, starting with a visual inspection and progressing to sensor and circuit testing, is crucial for identifying the root cause. Addressing the issue promptly is essential for maintaining optimal visibility and safe driving conditions.