AutoCodes – GMC – B3477 GMC

B3477 GMC 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 GMC 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 463

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

What does this mean?

What are the Possible Causes of the DTC B3477 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code B3477 GMC?

- The common symptoms of this code include the left rear window being unable to operate using the express up or down function.

2. What are the possible causes of OBDII code B3477 GMC?

- Possible causes for this code include a malfunctioning left rear window switch, damaged wiring in the window circuit, or a faulty control module.

3. How can I diagnose OBDII code B3477 GMC?

- You can diagnose this code by checking the left rear window switch for proper operation, inspecting the wiring for any damage or loose connections, and using a diagnostic tool to scan the control module.

4. What are the repair tips for OBDII code B3477 GMC?

- Repair tips for this code include repairing or replacing any damaged wiring, testing and replacing the left rear window switch if necessary, and reprogramming the control module if needed.

5. Can I fix OBDII code B3477 GMC on my own?

- Depending on your skill level and access to tools, you may be able to fix this code on your own by following the diagnostic and repair steps outlined in the service manual.

6. Is it safe to continue driving with OBDII code B3477 GMC active?

- It is generally safe to continue driving with this code, but it is recommended to address the issue promptly to prevent further damage to the window circuit.

7. Can extreme weather conditions trigger OBDII code B3477 GMC?

- Extreme weather conditions can potentially affect the operation of the left rear window circuit and contribute to triggering this code.

8. Is resetting the OBDII system an effective way to clear code B3477 GMC?

- Resetting the OBDII system may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How long does it typically take to repair OBDII code B3477 GMC?

- The repair time for this code can vary depending on the specific cause and complexity of the issue, but it may take anywhere from a few hours to a day to complete the repair.

10. Can OBDII code B3477 GMC affect other vehicle systems?

- While this code specifically relates to the left rear window circuit, it is important to address it promptly to prevent any potential impacts on other vehicle systems that rely on the control module.