Introduction
The B1713 diagnostic trouble code (DTC) indicates a fault within the vehicle's power mirror system, specifically relating to the "R Down" input signal from the mirror switch. This means the vehicle's computer (often the Body Control Module or BCM) is detecting that the signal for moving the right-side mirror downwards is constantly active, even when the mirror switch is not being operated in that direction. This can prevent the mirror from functioning correctly, cause battery drain, or indicate a more serious electrical problem. Understanding the causes, symptoms, and troubleshooting steps for B1713 is crucial for accurate diagnosis and repair.
Comprehensive Table
| Topic | Description | Potential Causes |
|---|---|---|
| Definition of B1713 | Diagnostic Trouble Code indicating the right-side mirror "down" input signal to the vehicle's computer is constantly "high" (active), even when not commanded. | Short circuit to voltage in the "R Down" signal wire, faulty mirror switch, internal BCM failure, wiring harness damage, corroded connectors, water intrusion. |
| Symptoms | Observable issues resulting from the fault. | Right-side mirror moves down continuously or refuses to move at all, right-side mirror only moves down, inability to adjust the right-side mirror in other directions, battery drain (if the motor remains active), malfunctioning of other power mirror functions. |
| Possible Causes | Underlying reasons for the fault code being triggered. | Short Circuit to Power: The signal wire for the "R Down" function is touching a power source, sending a constant "on" signal. Faulty Mirror Switch: The switch itself is malfunctioning, internally shorting the "R Down" circuit. BCM Failure: Internal failure of the BCM. Wiring Harness Damage: Wires are damaged, pinched, or broken. Corroded Connectors: Corrosion creates unwanted electrical paths. Water Intrusion: Water in connectors can cause shorts. |
Detailed Explanations
Definition of B1713:
The B1713 code specifically refers to a problem with the input signal received by the vehicle's computer (typically the BCM) from the right-side mirror switch when the driver attempts to move the mirror downwards. The computer expects to see this signal only when the switch is actively pressed in the "down" direction. When the computer detects a constant "high" (active) signal on this input, even when the switch is not pressed, it sets the B1713 DTC. This constant signal indicates a fault in the circuit.
Symptoms:
The symptoms of a B1713 code can vary depending on the severity and specific cause of the problem. The most common symptom is that the right-side mirror either moves down continuously without being commanded or refuses to move at all. In some cases, the mirror might only move in the downward direction, and other adjustments (up, left, right) may be impossible. A more subtle symptom could be a slow battery drain, especially if the mirror motor is continuously trying to operate. Finally, other power mirror functions may also be affected due to the electrical interference.
Possible Causes:
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Short Circuit to Power: This is a frequent culprit. The "R Down" signal wire, which runs from the mirror switch to the BCM, might be chafed, pinched, or damaged, causing it to come into contact with a wire carrying voltage (power). This creates a direct path for the voltage to flow to the BCM, mimicking the "switch pressed" signal even when it is not.
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Faulty Mirror Switch: The mirror switch itself can fail internally. Over time, the contacts inside the switch can wear out, become corroded, or even break, leading to an internal short circuit. This internal short can permanently connect the "R Down" circuit, sending a constant "on" signal to the BCM.
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BCM Failure: While less common, the BCM itself can fail internally. The BCM is responsible for interpreting the signals from the mirror switch and controlling the mirror motors. If the input circuit within the BCM that receives the "R Down" signal malfunctions, it might falsely interpret a constant "high" signal, even if the switch and wiring are functioning correctly.
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Wiring Harness Damage: The wiring harness that connects the mirror switch to the BCM can be damaged due to physical stress, vibration, or exposure to harsh environments. Damaged wires can become frayed, broken, or shorted to each other or to ground, leading to the B1713 code.
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Corroded Connectors: Corrosion on the electrical connectors in the mirror circuit can create unwanted electrical paths. This corrosion can act as a conductor, allowing voltage to leak into the "R Down" signal wire, mimicking a constant "on" signal.
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Water Intrusion: Water entering the mirror switch, connectors, or wiring harness can cause short circuits and corrosion. Water can create a conductive path between circuits, leading to false signals and the B1713 code. This is especially common in vehicles that have been exposed to flooding or leaks.
Frequently Asked Questions
What does the B1713 code mean?
The B1713 code means the vehicle's computer detects a constant "on" signal for the right-side mirror's "down" movement, even when the switch isn't pressed. This indicates an electrical fault in the mirror control circuit.
Can I fix the B1713 code myself?
Possibly, depending on your mechanical and electrical skills. You can start by inspecting the mirror switch, wiring, and connectors for damage, corrosion, or shorts, but professional diagnostic tools may be needed.
Is it safe to drive with a B1713 code?
Generally, yes, but it depends on the symptoms. If the mirror is moving uncontrollably or causing a battery drain, it's best to address the issue promptly.
How much does it cost to fix a B1713 code?
The cost varies depending on the cause. A simple wiring repair might be inexpensive, while replacing the mirror switch or BCM can be significantly more costly.
What tools do I need to diagnose a B1713 code?
A multimeter, wiring diagrams for your vehicle, and potentially a scan tool that can read live data from the BCM are helpful. Also, basic hand tools for accessing the mirror switch and wiring.
Conclusion
The B1713 code signals a problem within the right-side mirror control circuit, specifically indicating a constant "down" signal. Thoroughly inspecting the mirror switch, wiring harness, connectors, and potentially the BCM is crucial for accurate diagnosis and repair. Addressing this issue promptly will prevent further complications and ensure the proper functioning of your vehicle's power mirror system.