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Engine-Codes – Acura – B1657 Acura

B1657 Acura Code - Rear Bumper LF Antenna Circuit Short

Quick Answer

The B1657 code for Acura vehicles indicates a problem with the Rear Bumper LF (Left Front) Antenna Circuit, specifically a short circuit. Common causes include Wiring damage or corrosion affecting the LF antenna circuit, Faulty LF antenna module, Water intrusion into the antenna circuit. 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
B1657 Acura indicates Rear Bumper LF Antenna Circuit Short.
Common causes
Common causes include Wiring damage or corrosion affecting the LF antenna circuit, Faulty LF antenna module, Water intrusion into the antenna circuit.
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 B1657 Acura Description

The B1657 code for Acura vehicles indicates a problem with the Rear Bumper LF (Left Front) Antenna Circuit, specifically a short circuit. This antenna is part of the vehicle's keyless entry system, which allows for convenient locking and unlocking of the car without using a physical key. When this circuit experiences a short, it can disrupt the communication between the key fob and the vehicle, leading to issues with the keyless entry system.

OBDII Code B1657 Acura - Rear Bumper LF Antenna Circuit Short
B1657 Acura Code - Rear Bumper LF Antenna Circuit Short

Common Causes of B1657 Acura

  1. Wiring damage or corrosion affecting the LF antenna circuit.
  2. Faulty LF antenna module.
  3. Water intrusion into the antenna circuit.
  4. Electrical short caused by a damaged component in the circuit.
  5. Poor connection between the LF antenna and the vehicle's main electrical system.

Symptoms of B1657 Acura

  1. Difficulty locking or unlocking the vehicle using the key fob.
  2. Intermittent functioning of the keyless entry system.
  3. Alarm system triggering unexpectedly.
  4. Inability to start the vehicle due to key fob detection issues.

How to Fix B1657 Acura

  1. Begin by conducting a visual inspection of the LF antenna circuit wiring to check for any visible damage or corrosion. Repair or replace any damaged wiring as needed.
  2. Test the LF antenna module to determine if it is functioning correctly. Replace the module if it is found to be faulty.
  3. Check for any signs of water intrusion into the antenna circuit and address the source of the intrusion to prevent future issues.
  4. Use a multimeter to diagnose the presence of an electrical short in the circuit. Repair or replace any components causing the short.
  5. Ensure a secure and proper connection between the LF antenna and the vehicle's electrical system to restore functionality.

Cost to Fix B1657 Acura

The typical repair costs for addressing a Rear Bumper LF Antenna Circuit Short can vary depending on the extent of the damage and the specific components that require replacement. In general, the cost of parts for this repair can range from $100 to $300, while labor costs may add an additional $100 to $200 to the total bill. Keep in mind that diagnosis time and labor rates at auto repair shops can fluctuate based on various factors, so it's advisable to inquire about local rates for a more accurate estimate.

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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 B1657 Acura Code

1. What are the common symptoms of OBDII code B1657 in Acura vehicles?

- The common symptoms include issues with the LF (left front) antenna circuit in the rear bumper, such as poor reception or loss of signal.

2. What causes the Rear Bumper LF Antenna Circuit Short code B1657 in Acura cars?

- The B1657 code is usually triggered by a short circuit in the LF antenna circuit located in the rear bumper.

3. How can I diagnose the Rear Bumper LF Antenna Circuit Short in my Acura?

- To diagnose the issue, you may need to inspect the LF antenna wiring in the rear bumper for any visible damage or shorts. Using a multimeter to test the circuit continuity can also help pinpoint the problem.

4. Can a DIY enthusiast repair the B1657 code related to the LF Antenna Circuit Short in an Acura?

- Repairing the LF Antenna Circuit Short code B1657 may require advanced electrical knowledge and tools. It is recommended to seek professional help to properly diagnose and repair the issue.

5. Are there any temporary fixes for the B1657 code in Acura vehicles?

- Temporary fixes such as resetting the OBDII system or disconnecting and reconnecting the LF antenna wiring may temporarily clear the code, but the underlying issue should still be addressed by a professional.

6. Is it safe to continue driving with the B1657 code triggered in an Acura?

- It is not recommended to continue driving with the B1657 code active, as it can affect the LF antenna's functionality, potentially leading to issues with keyless entry or other related systems.

7. How much does it typically cost to repair the B1657 code related to the LF Antenna Circuit Short in an Acura?

- The cost of repairing the B1657 code can vary depending on the extent of the damage and the labor rates of the repair shop. It is advisable to obtain quotes from multiple professionals for an accurate estimate.

8. Can extreme weather conditions cause the B1657 code to appear in Acura vehicles?

- Extreme weather conditions, such as heavy rain or exposure to extreme temperatures, can potentially damage the LF antenna circuit in the rear bumper, leading to the B1657 code.

9. Will disconnecting the LF antenna resolve the B1657 code issue in an Acura temporarily?

- Disconnecting the LF antenna may temporarily clear the B1657 code, but it is not a recommended long-term solution as it will affect the functionality of the keyless entry system and other related features.

10. Is the LF Antenna Circuit Short code B1657 a common issue in Acura vehicles?

- The B1657 code related to the LF Antenna Circuit Short is not extremely common but can occur in Acura vehicles, particularly in situations where the rear bumper wiring is exposed to damage.

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