B2347 — Mirror Switch Reference Voltage Positive Common Supply Low Voltage #

Note: The wording of this code may vary depending on the vehicle manufacturer (OEM).

• Mirror Switch Reference Voltage Low — Ford
• Mirror Adjustment Switch Power Supply Low — General Motors
• Mirror Control Switch Low Reference Voltage — Toyota
• Outside Mirror Switch Power Low — Nissan

Summary of code B2347 #

The B2347 diagnostic trouble code (DTC) indicates that the reference voltage (a specific, regulated electrical signal used for correct sensor and switch operation) supplied to the mirror switch is lower than expected. This circuit is responsible for providing the proper voltage needed for the side mirror adjustment switch to function. When the voltage drops below the threshold set by the OEM (Original Equipment Manufacturer), the vehicle’s control module detects this fault and stores the code. While this is not a powertrain or emission-related code, it can affect comfort and safety features. Addressing this issue ensures continued mirror adjustment and may prevent further electrical complications.

Common symptoms for code B2347 #

When this code appears, drivers or technicians may notice a range of issues, primarily related to the power mirror adjustment system. These symptoms can vary depending on the vehicle model and wiring configuration, but generally include:

• Power mirrors do not move when the switch is pressed
• Mirror movement is intermittent or only works in one direction
• Unresponsive mirror switch
• Other mirror-related functions, such as folding or memory position, may also fail
• No illumination on the mirror adjustment switch

Most frequent causes for code B2347 #

B2347 is typically triggered by electrical issues in the mirror switch circuit. The most common root causes, in order of likelihood, are as follows:

1. Open or damaged wiring (corrosion, pinched wires, broken connections) between the control module and the mirror switch
2. Faulty mirror switch (internal failure or short circuit)
3. Blown fuse in the mirror control circuit
4. Loose or corroded connector at the switch or module
5. Faulty body control module (rare, but possible if all else checks out)

Step-by-step diagnostic procedure for code B2347 #

To accurately identify the cause of B2347, follow this logical sequence. Each step helps rule out potential issues before moving to more complex diagnostics:

• 1. Confirm the code with a scan tool and check for related codes affecting the mirror system.
• 2. Inspect the mirror switch and surrounding area for any visible damage, loose connectors, or signs of moisture intrusion.
• 3. Use a multimeter to measure the reference voltage at the mirror switch connector. Compare readings to OEM specifications (usually around 5V or 12V, depending on design).
• 4. Check wiring continuity between the control module and the mirror switch — look for opens, shorts to ground, or high resistance.
• 5. Test the mirror switch itself by back-probing connectors or swapping with a known-good unit if available.
• 6. Inspect and test the relevant fuse(s) and relays in the mirror circuit.
• 7. If all wiring and components check out, consider inspecting or testing the body control module (BCM) as a last resort.

Possible repairs for code B2347 #

Once the root cause is identified, repairs should directly address the faulty component or connection. Typical solutions include:

• Repair or replace damaged wiring or connectors in the mirror switch circuit
• Replace the faulty mirror switch
• Replace blown fuse(s) in the mirror system
• Clean and secure corroded or loose connectors
• Replace or reprogram the body control module (only if verified as the cause)

Can you drive with code B2347? #

Yes, you can generally drive with code B2347 present, as this fault does not affect engine performance, braking, or core safety systems. However, the inability to adjust your mirrors can be a significant safety concern, especially if you cannot achieve a proper view of your surroundings. For optimal visibility and peace of mind, address this issue as soon as possible.

Vehicles most commonly affected by code B2347 #

While B2347 is a generic body code, it is most frequently observed in certain makes and models, particularly where power mirrors are standard. Some commonly reported vehicles include:

• Ford F-Series (F-150, F-250, etc.)
• Chevrolet Silverado and GMC Sierra
• Toyota Camry and Corolla
• Nissan Altima and Maxima
• Chrysler 300

This list is not exhaustive; any model with power-adjustable mirrors may experience this code.

Common mistakes & best practices for code B2347 #

Misdiagnosis can lead to wasted time and unnecessary parts replacement. Here are the most frequent errors and tips to avoid them:

• Assuming the mirror switch is always the culprit without checking wiring or fuses
• Overlooking corrosion in connectors, especially after water leaks or window issues
• Not verifying reference voltage at the switch with a proper multimeter
• Neglecting to check for related codes that could provide more context
• Failing to clear the code and retest after repairs

Express FAQ for code B2347 #

Still have questions? Here are quick answers to the most common concerns:

• Q: Will clearing the code fix my mirror?
  A: No, clearing the code will not restore mirror function unless the underlying electrical issue is repaired.
• Q: Can a bad mirror switch cause other problems?
  A: In rare cases, a shorted switch can affect other systems sharing the same power supply, such as window controls or interior lighting.