B2337 — Mirror Switch Assembly Circuit Open #

Note: The description for code B2337 may vary depending on the vehicle manufacturer. Always consult OEM documentation for exact terminology.

• B2337 — Mirror Switch Assembly Circuit Open (Ford, Lincoln, Mercury)
• B2337 — Outside Mirror Switch Circuit Open (General Motors)
• B2337 — Door Mirror Switch Open Circuit (Chrysler, Dodge, Jeep)

Summary of Code B2337 #

The B2337 diagnostic trouble code (DTC) indicates that the vehicle’s onboard computer has detected an open circuit within the mirror switch assembly. The mirror switch assembly is the set of electrical controls, typically located on the driver’s door, used to adjust the positions of the exterior mirrors. An open circuit means that there is a break in the electrical path, preventing current from flowing as intended. This code is primarily related to the power mirror adjustment system and is set when the control module (such as the Body Control Module, or BCM) senses a loss of continuity in the mirror switch wiring or internal components. While this issue does not usually affect vehicle drivability, it can impair your ability to safely adjust side mirrors.

Frequent Symptoms for Code B2337 #

When the B2337 code is stored, you may notice several telltale signs that indicate a problem with your mirror adjustment system. These symptoms can range from minor inconveniences to clear system failures. Watch out for the following:

• Inability to adjust one or both exterior mirrors using the mirror control switch
• Mirrors stuck in a fixed position
• No response or movement when pressing the mirror adjustment switch
• Intermittent or partial operation of the mirror controls
• Illumination of a warning light or message related to power mirrors on the dashboard (in some vehicles)

Probable Causes for Code B2337 #

In most cases, the root cause of a B2337 code is an electrical issue affecting the mirror switch assembly or its associated wiring. Here are the most frequent culprits, listed in order of likelihood:

1. Faulty mirror switch assembly (internal failure or worn-out contacts)
2. Open or broken wiring in the circuit between the switch and control module
3. Disconnected or corroded electrical connectors at the mirror switch or in the door harness
4. Blown fuse in the power mirror circuit
5. Faulty Body Control Module (BCM) (less common)

Step-by-Step Diagnosis for Code B2337 #

Diagnosing a B2337 code requires a systematic approach to isolate the open circuit and confirm the faulty component. Here’s a recommended process:

• Confirm the presence of code B2337 with an OBD-II/EOBD scan tool.
• Visually inspect the mirror switch assembly for signs of physical damage or wear.
• Check the electrical connectors at the mirror switch and in the door harness for corrosion, loose pins, or signs of water intrusion.
• Test for continuity across the mirror switch terminals using a digital multimeter—look for an open circuit (infinite resistance).
• Inspect the wiring harness between the mirror switch and BCM for breaks, pinches, or chafing—especially in the door jamb area, where wires commonly flex and fail.
• Check the fuse related to the power mirrors circuit and replace if necessary.
• If all wiring and components are intact, consider BCM diagnostics or replacement as a last resort.

Possible Repairs for Code B2337 #

Once you’ve pinpointed the cause of the B2337 code, the following repair actions may resolve the issue. Always address the underlying fault, not just the symptoms:

• Replace the faulty mirror switch assembly if internal failure is confirmed.
• Repair or replace damaged, broken, or open wiring in the mirror switch circuit.
• Clean, repair, or replace corroded or loose electrical connectors at the switch or in the door harness.
• Replace any blown fuses related to the power mirror system, and investigate the cause of fuse failure.
• If diagnosed, replace or reprogram the Body Control Module (rare; only after ruling out all other causes).

Is It Safe to Drive with Code B2337? #

Yes, you can continue to drive your vehicle with code B2337 present, as it does not affect core safety or drivetrain functions. However, keep in mind that you may not be able to adjust your side mirrors, which can impair your field of view and compromise driving safety, especially if other drivers use the vehicle. It’s wise to resolve this issue promptly to ensure you maintain full visibility and comply with road safety regulations.

Vehicles Most Commonly Affected by Code B2337 #

While an open circuit in the mirror switch assembly can potentially occur on any vehicle with power mirrors, certain makes and models—especially from Ford, General Motors, and Chrysler—report this code more frequently. You might encounter B2337 on:

• Ford F-150, Fusion, Explorer, Expedition
• Lincoln MKX, Navigator
• Mercury Milan, Mountaineer
• Chevrolet Silverado, Impala, Malibu
• GMC Sierra, Yukon
• Chrysler 300, Town & Country
• Dodge Ram, Grand Caravan
• Jeep Grand Cherokee, Liberty

Common Mistakes & Best Practices for Code B2337 #

A misdiagnosis or shortcut can lead to unnecessary repairs or persistent issues. Here are common pitfalls and tips for tackling a B2337 code:

• Assuming the switch is always at fault—wiring and connectors fail just as often.
• Replacing the mirror switch before thoroughly checking the wiring harness, especially in the door jamb.
• Overlooking corrosion or moisture in connectors, which can intermittently open the circuit.
• Neglecting to reset the code and verify repair by testing mirror operation after repairs.
• Always use OEM-quality replacement parts to ensure compatibility and longevity.

Quick FAQ for Code B2337 #

Q: Can I fix a B2337 code myself?
A: If you’re comfortable using basic tools and a multimeter, you can inspect connectors, check the fuse, and even replace the mirror switch yourself. For wiring or BCM issues, professional assistance is recommended.

Q: Will disconnecting the battery reset the code?
A: Disconnecting the battery may clear the code from memory temporarily, but if the underlying fault persists, the code will return as soon as the system performs its next check.