B2337 — Mirror Switch Assembly Circuit Open #

Note: The code label may vary depending on the manufacturer (OEM). Always refer to your service manual for OEM-specific terminology.

• Mirror Switch Circuit Open (Ford)
• Mirror Control Switch Open Circuit (Mazda)
• Power Mirror Switch Circuit Open (Chrysler)
• Side Mirror Switch Assembly Open (Toyota)

Summary of the B2337 Code #

The B2337 — Mirror Switch Assembly Circuit Open diagnostic trouble code (DTC) indicates the vehicle’s control module has detected an open circuit in the mirror switch assembly. In simple terms, an “open circuit” means the electrical pathway is incomplete, usually due to a break or disconnection, preventing the mirror switch from communicating with the vehicle’s electronics. This code is most commonly set in vehicles equipped with power-adjustable mirrors. While not typically a safety-critical code, it can impact convenience and visibility if mirror adjustment is needed. Understanding and addressing this code promptly can prevent further electrical issues within the driver’s door module.

Common Symptoms for Code B2337 #

When the B2337 code is present, drivers may notice issues related to the power mirror controls. These symptoms can range from subtle to obvious and often impact everyday comfort and safety. Typical symptoms include:

• Inoperative power mirrors (unable to adjust mirrors via the switch)
• Mirror adjustment works intermittently
• No response from the mirror control switch
• Illumination on the mirror switch may be absent
• Possible warning messages on the dashboard (in some models)

Most Likely Causes for B2337 #

The causes for a B2337 code are usually electrical in nature and tend to follow a predictable pattern. Understanding these causes helps prioritize diagnostic time and resources:

1. Faulty mirror switch assembly — The actual switch may internally fail or wear out.
2. Open or broken wiring — Wiring leading to the mirror switch may be cut, pinched, or disconnected, especially in the door harness area.
3. Poor electrical connections — Corroded or loose connectors at the mirror switch or door module can break the circuit.
4. Blown fuse — A fuse protecting the mirror circuit may have failed.
5. Faulty door module (if equipped) — The control unit managing the mirror functions may be defective.

Step-by-Step Diagnosis for Code B2337 #

Diagnosing a B2337 code requires a systematic approach to avoid misdiagnosis. Use the following steps to efficiently pinpoint the issue:

• Verify the code with an OBD-II/EOBD scanner and check for related DTCs.
• Test the operation of the power mirror switch and mirrors from inside the vehicle.
• Inspect the mirror switch assembly for physical damage or signs of wear.
• Check the wiring harness and connectors between the switch, mirror, and door module for breaks, corrosion, or loose pins.
• Test for voltage and ground at the mirror switch using a digital multimeter.
• Inspect and test the relevant fuse(s) in the vehicle’s fuse box.
• If all basic tests pass, use a wiring diagram to perform continuity tests between the switch and control module.
• Consult OEM service information for any Technical Service Bulletins (TSBs) related to mirror switch issues.

Possible Repairs for Code B2337 #

The correct repair depends on the cause found during diagnosis. Address the root cause to ensure a lasting fix:

• Replace a faulty mirror switch assembly if confirmed defective.
• Repair or replace damaged or open wiring in the mirror circuit.
• Clean and reconnect corroded or loose electrical connectors.
• Replace any blown fuse related to the power mirror circuit.
• If applicable, reprogram or replace a faulty door control module (consult OEM procedures).

Is It Safe to Drive with Code B2337? #

Yes — You can generally drive with code B2337 present, but with limitations: This code does not affect core vehicle safety systems. However, if you need to adjust your mirrors for better visibility and the switch is inoperative, your ability to drive safely could be compromised, especially in changing light or traffic conditions. Fix the problem at your earliest convenience to maintain optimal visibility and comfort.

Vehicles Most Commonly Affected by B2337 #

While B2337 can appear in various makes and models, it is most often reported in vehicles with advanced or power-operated mirror systems, particularly:

• Ford Focus, Fusion, F-150
• Mazda 3, Mazda 6
• Chrysler Town & Country, Dodge Caravan
• Toyota Camry, Corolla, RAV4
• Other vehicles with power mirror assemblies (check OEM documentation)

Common Mistakes & Best Practices for B2337 Diagnosis #

Misdiagnosing code B2337 is not uncommon, especially if the root cause is intermittent or hidden within the door harness. To avoid wasted time and unnecessary parts replacement, keep these tips in mind:

• Do not replace the mirror switch before checking wiring and connectors — wiring faults are frequent culprits.
• Always inspect the harness at the door hinge — frequent opening and closing can break wires inside the flexible boot.
• Verify power and ground at the switch before suspecting the switch itself.
• Consult OEM wiring diagrams to ensure proper circuit tracing.
• Clear the code after repairs and confirm functionality before returning the vehicle to service.

Express FAQ – B2337 Code #

Q: Will B2337 cause my mirrors to stop working completely?
A: In most cases, yes. The code typically means the power mirror switch is not able to send or receive signals, so you won’t be able to adjust your mirrors electrically.

Q: Can I fix B2337 myself?
A: If you’re comfortable with basic electrical troubleshooting—checking fuses, connectors, and visible wiring—you may be able to identify and fix simple issues. For advanced diagnostics or if replacement of modules is required, professional help is recommended.