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Engine-Codes – Generic – B3397

B3397 Code - Left Rear Window Up Switch Circuit Low

Quick Answer

The B3397 diagnostic trouble code (DTC) indicates a problem with the left rear window up switch circuit being low. Common causes include Damaged wiring in the left rear window switch circuit, Faulty left rear window up switch, Malfunctioning control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B3397 indicates Left Rear Window Up Switch Circuit Low.
Common causes
Common causes include Damaged wiring in the left rear window switch circuit, Faulty left rear window up switch, Malfunctioning control module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code B3397 Description

The B3397 diagnostic trouble code (DTC) indicates a problem with the left rear window up switch circuit being low. This means that the control module has detected a lower than expected voltage signal from the left rear window up switch. The window up switch is responsible for sending a signal to the control module to raise the left rear window. When the circuit is low, it can prevent the window from operating correctly, leading to issues with window functionality.

OBDII Code B3397 - Left Rear Window Up Switch Circuit Low
B3397 Code - Left Rear Window Up Switch Circuit Low

Common Causes of B3397

  1. Damaged wiring in the left rear window switch circuit.
  2. Faulty left rear window up switch.
  3. Malfunctioning control module.
  4. Poor electrical connection in the circuit.
  5. Water damage or corrosion in the switch circuit.

Symptoms of B3397

  1. Left rear window not responding to switch input.
  2. Inability to raise or lower the left rear window.
  3. Unusual noises when trying to operate the window.
  4. Window getting stuck in a partially open or closed position.

How to Fix B3397

  1. Begin by inspecting the wiring in the left rear window switch circuit for any visible damage or corrosion.
  2. Test the left rear window up switch for proper functionality using a multimeter.
  3. Check the control module for any signs of malfunction and ensure it is receiving the correct voltage.
  4. Repair or replace any damaged wiring, faulty switch, or malfunctioning control module as needed.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool after completing the repair.

Cost to Fix B3397

The typical repair costs for addressing the B3397 code can vary depending on the specific cause of the issue. In general, replacing a faulty switch or repairing damaged wiring may cost between $100 to $300, including parts and labor. However, if the control module needs to be replaced, the cost can increase to $300 to $600 or more. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

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Code B3397 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3397 Code

1. What does OBDII code B3397 mean?

Code B3397 indicates a low voltage or malfunction in the left rear window up switch circuit, typically caused by wiring issues or a faulty switch.

2. What are the common symptoms of code B3397?

Symptoms include the left rear window not rolling up, intermittent window operation, or no response when the window up switch is pressed.

3. What causes code B3397 to appear?

The code can be triggered by a faulty window switch, damaged wiring or connectors, a blown fuse, or an issue with the window motor.

4. Can I still drive my car with code B3397?

Yes, you can drive your car, but the left rear window may not function properly, which could be inconvenient or a security concern.

5. How do I diagnose code B3397?

Start by inspecting the window switch, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

6. How can I fix code B3397?

Repairs may involve replacing the window switch, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the window motor if necessary.

7. How much does it cost to repair code B3397?

Repair costs vary but may range from $50 to $200, depending on the extent of the issue and whether parts like the switch or motor need replacement.

8. Can a blown fuse cause code B3397?

Yes, a blown fuse in the power window circuit can cause this code by interrupting the electrical flow to the switch.

9. Will resetting the code fix the problem?

Resetting the code will clear it temporarily, but the underlying issue must be fixed, or the code will return.

10. Does code B3397 always mean the switch is faulty?

No, while the switch is a common culprit, the code can also result from wiring problems, connector issues, or a faulty window motor.

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