B1723 - Mirror Motor Control Circuit 1 Performance

Introduction

The B1723 diagnostic trouble code (DTC) indicates a problem with the mirror motor control circuit 1 performance in a vehicle. This circuit is responsible for controlling the movement of one of the side mirrors, specifically its ability to adjust horizontally or vertically. Understanding the potential causes, symptoms, and troubleshooting steps associated with this code is crucial for diagnosing and resolving issues related to mirror functionality. This article will delve into the specifics of the B1723 code, providing a comprehensive guide for both novice and experienced automotive enthusiasts.

Comprehensive Table: B1723 - Mirror Motor Control Circuit 1

Topic	Description	Possible Causes
Definition	B1723 - Mirror Motor Control Circuit 1 Performance: Indicates that the vehicle's computer (ECU/PCM) has detected a performance issue within the control circuit for one of the mirror motors. "Circuit 1" typically refers to a specific motor function, like vertical or horizontal movement.	Damaged Mirror Motor: The mirror motor itself is faulty and unable to operate within the expected parameters. Open or Shorted Wiring: Wiring harness connected to the mirror motor and control module has an open circuit (break in the wire) or a short circuit (wire touching ground or another wire). Loose or Corroded Connectors: Connectors in the mirror motor circuit are loose, corroded, or damaged, leading to poor electrical connection. Faulty Mirror Switch: The mirror control switch (the one the driver uses to adjust the mirrors) is defective, sending incorrect signals to the control module. Faulty Mirror Control Module: The module responsible for controlling the mirror motors is malfunctioning. Power Supply Issues: Insufficient voltage or ground to the mirror motor circuit. Mechanical Binding: Physical obstruction preventing the mirror from moving freely. Software Glitch (Rare): In rare cases, a software glitch in the vehicle's computer system might trigger the code.
Common Symptoms	Mirror fails to move in one or more directions. Mirror moves erratically or intermittently. Mirror makes unusual noises during operation. Mirror doesn't respond to the control switch. The B1723 DTC is stored in the vehicle's computer. Other electrical issues may be present.
Diagnostic Steps	1. Retrieve DTCs: Use an OBD-II scanner to confirm the presence of the B1723 code and any other related codes. 2. Visual Inspection: Inspect the mirror, wiring, and connectors for any signs of damage, corrosion, or loose connections. 3. Mirror Switch Test: Test the mirror switch for proper operation using a multimeter. Check for continuity and voltage output. 4. Mirror Motor Test: Directly apply power and ground to the mirror motor to see if it functions. 5. Wiring Harness Test: Use a multimeter to check for continuity and shorts in the wiring harness connecting the mirror motor, switch, and control module. 6. Control Module Test: If all other components are working, the control module may be faulty. This often requires specialized equipment and knowledge. 7. Mechanical Inspection: Check for any physical obstructions or binding preventing the mirror from moving freely. 8. Software Update: Check for any available software updates for the vehicle's computer system.
Tools Required	OBD-II Scanner Multimeter Basic Hand Tools (screwdrivers, pliers, etc.) Wiring Diagram for the specific vehicle Connector Cleaning Solution Dielectric Grease
Severity	Moderate. The mirror not functioning properly can be a safety concern, especially when changing lanes or parking.
Affected Systems	Power Mirror System Body Control Module (BCM) or dedicated Mirror Control Module * Electrical Wiring Harness
Related Codes	B1724, B1725, B1726 (related to other mirror motor circuits or functions) * Other codes related to electrical system or body control module.
Repair Strategies	Replace damaged mirror motor. Repair or replace damaged wiring or connectors. Replace faulty mirror switch. Replace faulty mirror control module. Remove any mechanical obstructions. Apply dielectric grease to connectors to prevent corrosion. * Update vehicle software (if applicable).
Cost of Repair	Varies widely depending on the cause. Replacing a mirror motor can range from $50 to $300 (parts and labor). Replacing a control module can be more expensive, ranging from $200 to $500 or more. Wiring repairs can range from $50 to $200 depending on the complexity.

Detailed Explanations

Definition: The B1723 code signifies that the vehicle's onboard computer has detected a performance issue within the control circuit of one of the mirror motors. The term "Circuit 1" usually refers to a specific function of the mirror motor, which could be either the vertical or horizontal adjustment. This means the computer is receiving feedback that the motor isn't performing as expected, either drawing too much current, not responding to commands, or showing other anomalies.

Common Symptoms: The most noticeable symptom is the affected mirror failing to move in one or more directions. It might move erratically, intermittently, or not at all. Unusual noises during operation, such as grinding or clicking sounds, can also indicate a problem. The mirror might simply not respond to the control switch. The presence of the B1723 DTC when scanned is a definitive symptom. You may also experience other seemingly unrelated electrical issues due to the circuit malfunction.

Diagnostic Steps: Diagnosing the B1723 code involves a systematic approach. First, use an OBD-II scanner to confirm the code and check for any related codes. A visual inspection of the mirror, wiring, and connectors is crucial to identify any obvious damage. Next, test the mirror switch for proper operation using a multimeter. Then, directly apply power and ground to the mirror motor to test its functionality. The wiring harness should be tested for continuity and shorts. If all other components are working correctly, the control module may be faulty and require further testing. Finally, examine the mirror's mechanics for any physical obstructions.

Tools Required: Several tools are essential for diagnosing and repairing the B1723 code. An OBD-II scanner is necessary to read the DTCs. A multimeter is crucial for testing the mirror switch, wiring harness, and power supply. Basic hand tools, such as screwdrivers and pliers, are needed for disassembly and reassembly. A wiring diagram specific to the vehicle is essential for tracing the circuits. Connector cleaning solution and dielectric grease are helpful for cleaning and protecting electrical connections.

Severity: The severity of the B1723 code is considered moderate. While it doesn't typically prevent the vehicle from running, a non-functional or malfunctioning mirror can be a safety concern, especially when changing lanes or parking. Reduced visibility can increase the risk of accidents.

Affected Systems: The B1723 code primarily affects the power mirror system. However, it can also involve the Body Control Module (BCM) or a dedicated Mirror Control Module, depending on the vehicle's design. The electrical wiring harness connecting these components is also affected.

Related Codes: The B1723 code is often accompanied by other related codes, such as B1724, B1725, and B1726, which relate to other mirror motor circuits or functions. Other codes related to the electrical system or body control module may also be present.

Repair Strategies: Repair strategies for the B1723 code depend on the underlying cause. Replacing a damaged mirror motor is a common solution. Repairing or replacing damaged wiring or connectors is also frequently necessary. A faulty mirror switch or control module may also need to be replaced. Removing any mechanical obstructions can resolve the issue in some cases. Applying dielectric grease to connectors can help prevent corrosion. In rare cases, updating the vehicle's software may be required.

Cost of Repair: The cost of repair for the B1723 code can vary significantly depending on the cause. Replacing a mirror motor can range from $50 to $300, including parts and labor. Replacing a control module can be more expensive, ranging from $200 to $500 or more. Wiring repairs can range from $50 to $200, depending on the complexity of the damage.

Frequently Asked Questions

What does the B1723 code mean? This code indicates a performance issue within the control circuit for one of the mirror motors, usually affecting vertical or horizontal adjustment.
Can I drive with the B1723 code? Yes, but it is not recommended as a malfunctioning mirror can impair visibility and pose a safety risk.
Is the B1723 code difficult to fix? The difficulty varies; simple fixes like connector cleaning are easy, while control module replacement requires more expertise.
How do I test the mirror motor? You can directly apply power and ground to the motor to see if it functions correctly.
Can a bad mirror switch cause the B1723 code? Yes, a faulty mirror switch can send incorrect signals, triggering the B1723 code.

Conclusion

The B1723 diagnostic trouble code signals a performance issue within the mirror motor control circuit. By understanding the potential causes, symptoms, and diagnostic steps, you can effectively troubleshoot and resolve the problem, ensuring the proper functionality of your vehicle's mirrors. Prioritize safety and seek professional assistance when needed.