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U1549 Chevrolet Code - Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus

Quick Answer

The U1549 Chevrolet code indicates that there is a communication issue between the Body Control Module (BCM) and the rear wiper motor on the Local Interconnect Network (LIN) bus. Common causes include Faulty rear wiper motor, Loose or corroded electrical connections between the BCM and rear wiper motor, Defective BCM. 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
U1549 Chevrolet indicates Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus.
Common causes
Common causes include Faulty rear wiper motor, Loose or corroded electrical connections between the BCM and rear wiper motor, Defective BCM.
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 Aug 18, 2024
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Code U1549 Chevrolet Description

The U1549 Chevrolet code indicates that there is a communication issue between the Body Control Module (BCM) and the rear wiper motor on the Local Interconnect Network (LIN) bus. The LIN bus is a communication network used by various control modules in the vehicle to exchange information. In this case, the BCM has lost communication with the rear wiper motor, which can lead to the rear wiper not functioning properly. This can affect the vehicle's performance by hindering visibility through the rear windshield, especially in adverse weather conditions. If not addressed, this issue can potentially lead to further communication problems between the BCM and other components on the LIN bus.

OBDII Code U1549 Chevrolet - Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
U1549 Chevrolet Code - Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus

Common Causes of U1549 Chevrolet

  1. Faulty rear wiper motor.
  2. Loose or corroded electrical connections between the BCM and rear wiper motor.
  3. Defective BCM.
  4. Wiring harness issues.
  5. Water damage or corrosion affecting the LIN bus communication.

Symptoms of U1549 Chevrolet

  1. Rear wiper not working or erratic operation.
  2. Rear wiper not stopping at the correct position.
  3. Warning light on the dashboard related to the rear wiper system.
  4. Loss of control over rear wiper functions from the interior switch.

How to Fix U1549 Chevrolet

  1. Begin by performing a visual inspection of the rear wiper motor, wiring, and connections for any visible damage or corrosion.
  2. Use a scan tool to diagnose the exact nature of the communication issue between the BCM and rear wiper motor.
  3. Test the rear wiper motor to ensure it is functioning correctly and receiving the proper signals from the BCM.
  4. Repair or replace any damaged wiring, connectors, or components as necessary.
  5. Clear the diagnostic trouble codes and test the rear wiper system to confirm proper operation.

Cost to Fix U1549 Chevrolet

The typical repair costs for addressing a U1549 Chevrolet code can vary depending on the specific cause of the issue. In general, replacing a faulty rear wiper motor can range from $100 to $300, while addressing wiring or connection problems may cost between $50 to $150. Labor costs can add an additional $80 to $150 per hour, with the total repair bill potentially ranging from $150 to $500 or more. It's important to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of your vehicle.

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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 U1549 Chevrolet Code

1. What are the common symptoms of OBDII code U1549 in a Chevrolet related to the Body Control Module losing communication with the rear wiper motor on the LIN bus?

The common symptoms include the rear wiper not working, erratic wiper operation, or a wiper that does not turn off.

2. What are the possible causes of the Body Control Module losing communication with the rear wiper motor on the LIN bus in a Chevrolet?

Possible causes include a faulty rear wiper motor, damaged wiring or connectors, a malfunctioning Body Control Module, or a communication network issue.

3. How can I diagnose the issue causing OBDII code U1549 in my Chevrolet?

To diagnose the issue, you can start by checking the rear wiper motor for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to communicate with the Body Control Module for troubleshooting.

4. Is it safe to continue driving my Chevrolet with OBDII code U1549 related to the rear wiper motor communication issue?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure proper functioning of the rear wiper system.

5. Can I repair OBDII code U1549 in my Chevrolet by simply resetting the fault code?

Resetting the fault code may temporarily clear the warning light, but it will not fix the underlying issue causing the communication problem between the Body Control Module and the rear wiper motor.

6. What are some tips for repairing OBDII code U1549 in a Chevrolet myself?

Some DIY repair tips include checking and cleaning the connectors, inspecting the wiring for any damage, and ensuring the rear wiper motor is functioning correctly.

7. Do I need specialized tools to repair OBDII code U1549 in my Chevrolet?

While specialized tools like a scan tool can be helpful for diagnosing the issue, basic tools like a multimeter for checking electrical connections and a set of wrenches for removing components may be sufficient for basic repairs.

8. Why is it important to address OBDII code U1549 in my Chevrolet promptly?

Addressing the code promptly is important to ensure the proper functioning of the rear wiper system, which can improve visibility and safety while driving, especially in adverse weather conditions.

9. Can extreme weather conditions or environmental factors contribute to the occurrence of OBDII code U1549 in a Chevrolet?

Extreme weather conditions or exposure to moisture can potentially cause issues with the rear wiper motor or the communication between the Body Control Module and the motor, leading to the code U1549.

10. How much does it typically cost to repair OBDII code U1549 in a Chevrolet at a professional repair shop?

The cost of repairing OBDII code U1549 can vary depending on the specific cause of the issue, but it may involve diagnostic fees, parts replacement costs, and labor charges, which can range from a few hundred to a few thousand dollars.

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