AutoCodes – Generic – B3397

B3397 Code - Left Rear Window Up Switch Circuit Low

Quick Answer

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). Common causes include Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) circuit poor electrical connection. 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 Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) circuit poor electrical connection.
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.

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Code Popularity 440

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3397 Description

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). There are no external circuits. The DDSA internally supplies power and ground to the contacts of each of the integral window switches. When one of the switches is operated, the switch contacts close, providing the DDSA with a specific window switch signal. The DDSA processes this signal, assigns a digital message to it, and sends the message to the appropriate Driver Door Module (DDM), Passenger Front Door Module (PDM), Left Rear Door Module (LRDM), or Right Rear Door Module (RRDM), via the class 2 serial data circuit. The door module, upon receiving the message, examines other relevant information available on the class 2 serial data line in order to determine if conditions are correct for window operation to occur. If conditions are correct, the door module applies power and ground to the associated window motor and circuits in order to move the window. If the DDSA determines that one of its built in window switches is closed for more than 15 continuous seconds, it sets the DTC.

OBDII Code B3397 - Left Rear Window Up Switch Circuit Low - AutoCodes.com — B3397 Code - Left Rear Window Up Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3397?

Faulty Driver Door Switch Assembly (DDSA)
Driver Door Switch Assembly (DDSA) harness is open or shorted
Driver Door Switch Assembly (DDSA) circuit poor electrical connection
Faulty Left Rear Door Module (LRDM)
Faulty Driver Door Module (DDM)

How to Fix the DTC B3397?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3397 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B3397 code?

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Need Help with the Code?

Get the B3397 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3397 Buick — Left Rear Window Up Switch Circuit Low
B3397 Cadillac — Left Rear Window Up Switch Circuit Low
B3397 Chevrolet — Left Rear Window Up Switch Circuit Low
B3397 GMC — Left Rear Window Up Switch Circuit Low

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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