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Engine-Codes – Generic – B1639

B1639 Code - Mirror Passenger Left Circuit Failure

Quick Answer

The diagnostic code B1639 indicates a Mirror Passenger Left Circuit Failure. Common causes include Wiring damage or short circuit, Faulty mirror motor, Defective mirror switch. 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
B1639 indicates Mirror Passenger Left Circuit Failure.
Common causes
Common causes include Wiring damage or short circuit, Faulty mirror motor, Defective mirror switch.
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 07, 2024
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Code B1639 Description

The diagnostic code B1639 indicates a Mirror Passenger Left Circuit Failure. This means that there is an issue with the electrical circuit that controls the passenger side mirror on the vehicle. The mirror's ability to adjust and function properly may be compromised, affecting visibility and overall safety while driving.

OBDII Code B1639 - Mirror Passenger Left Circuit Failure
B1639 Code - Mirror Passenger Left Circuit Failure

Common Causes of B1639

  1. Wiring damage or short circuit.
  2. Faulty mirror motor.
  3. Defective mirror switch.
  4. Body control module malfunction.
  5. Water intrusion or corrosion in the mirror circuit.

Symptoms of B1639

  1. Inability to adjust the passenger side mirror.
  2. Erratic movement or shaking of the mirror when attempting to adjust it.
  3. Mirror not responding to control inputs from the driver's side switch.
  4. Warning light on the dashboard indicating a mirror system fault.

How to Fix B1639

  1. Begin by visually inspecting the wiring and connections related to the passenger side mirror. Look for any signs of damage, corrosion, or loose connections.
  2. Test the mirror motor by applying power directly to it to check for proper operation. Replace the motor if it is faulty.
  3. Check the mirror switch for continuity and proper function. Replace the switch if necessary.
  4. If the above steps do not resolve the issue, diagnose the body control module for any faults related to the mirror circuit. Replace or repair the module as needed.
  5. After completing the repairs, test the mirror to ensure it adjusts correctly in all directions.

Cost to Fix B1639

The cost of repairing a Mirror Passenger Left Circuit Failure can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $100 to $300 for parts and labor. Keep in mind that rates at auto repair shops can vary, so it's recommended to get quotes from multiple shops to find the best price. Additionally, the specific diagnosis time and labor rates may impact the final cost, so be sure to inquire about these details before proceeding with the repair.

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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 B1639 Code

1. What are the common symptoms of OBDII code B1639 (Mirror Passenger Left Circuit Failure)?

The common symptoms include the passenger side mirror not adjusting or moving properly, and the mirror indicator light on the switch not functioning.

2. What are some possible causes of OBDII code B1639?

Possible causes include a faulty mirror motor, damaged wiring or connectors in the mirror circuit, a defective mirror switch, or issues with the mirror control module.

3. How can I diagnose the Mirror Passenger Left Circuit Failure code B1639?

Diagnosing this code involves checking the mirror motor operation, inspecting the wiring and connectors for damage, testing the mirror switch functionality, and scanning the mirror control module for any fault codes.

4. Can I still drive my vehicle with OBDII code B1639 present?

Yes, you can still drive your vehicle with this code present, but it is recommended to address the issue to ensure proper operation of the passenger side mirror.

5. How can I repair OBDII code B1639 myself?

You can repair this code by first checking the mirror motor and wiring for any issues, replacing any faulty components, and clearing the code using an OBDII scanner. If unsure, consult a professional mechanic for assistance.

6. Is it safe to fix OBDII code B1639 on my own?

If you have experience working with automotive electrical systems, you can attempt to fix this code on your own. However, if you are unsure or unfamiliar with this type of repair, it is best to seek help from a qualified mechanic.

7. Will resetting the OBDII code B1639 make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not resolved, the code is likely to return. It's essential to diagnose and fix the root cause of the problem.

8. How much does it typically cost to repair OBDII code B1639?

The cost of repairing this code can vary depending on the specific issue causing it, the labor rates in your area, and the cost of any replacement parts needed. It is recommended to get a few quotes from mechanics for an accurate estimate.

9. Can extreme weather conditions cause OBDII code B1639 to trigger?

Extreme weather conditions, especially moisture and corrosion, can potentially contribute to the development of electrical issues that trigger code B1639. It is important to keep the vehicle's electrical components well-maintained to prevent such problems.

10. Will fixing OBDII code B1639 improve my vehicle's overall performance?

Fixing this code may not directly impact your vehicle's performance but will ensure the proper functioning of the passenger side mirror, which is essential for safe driving and visibility.

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