AutoCodes – Buick – B3477 Buick

B3477 Buick Code - Left Rear Window Express Up or Down 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: B3477 Buick indicates Left Rear Window Express Up or Down 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 452

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 B3477 Buick 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 B3477 Buick - Left Rear Window Express Up or Down Circuit Low - AutoCodes.com — B3477 Buick Code - Left Rear Window Express Up or Down Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3477 Buick?

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 B3477 Buick?

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 B3477 Buick 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.

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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 B3477 Buick Code

1. What does the OBDII code B3477 mean on a Buick?

The code B3477 indicates a problem with the left rear window express up or down circuit, specifically that the circuit is experiencing low voltage or a short.

2. What are the common symptoms of code B3477 on a Buick?

Common symptoms include the left rear window not operating properly, only partially moving, or failing to respond to express up or down commands.

3. What causes the B3477 code to appear on a Buick?

Causes can include a faulty window switch, damaged wiring or connectors in the circuit, a malfunctioning window motor, or a short to ground.

4. Can a blown fuse cause the B3477 code on a Buick?

Yes, a blown fuse associated with the left rear window circuit can cause this code, as it can interrupt power to the system.

5. How do I diagnose the B3477 code on my Buick?

Start by inspecting the wiring and connectors for damage or corrosion. Then, test the window switch and motor for proper operation, and check for any blown fuses.

6. Can I still operate the window if the B3477 code is present?

In some cases, the window may still operate manually but may not respond to express up or down commands. In other cases, the window may be completely inoperative.

7. How can I fix the B3477 code on a Buick?

Repairs may involve replacing a damaged window switch, repairing or replacing wiring, addressing a short to ground, or replacing the window motor if it is faulty.

8. Is the B3477 code a serious issue?

While it is not a critical safety issue, it can be inconvenient and should be addressed to restore full functionality to the rear window.

9. What tools do I need to troubleshoot the B3477 code?

You will need a multimeter to test for voltage and continuity, a scan tool to clear the code after repairs, and possibly basic tools like screwdrivers to access the switch or motor.

10. Can I clear the B3477 code without fixing the issue?

Clearing the code without fixing the underlying issue will not resolve the problem, and the code is likely to reappear when the fault is detected again.